Dashboard Warning Lights in 2026: What Each One Means, Which Colour Means Stop, and Can You Keep Driving

This page is a map. Every light has a short section built from federal rules (the safety standards in 49 CFR Part 571, plus the federal OBD inspection rule, 40 CFR 85.2222, and California's OBD fact sheet for the check engine light) and from what five carmakers print for their own owners. Where PulsCar has a full guide to one light, the section links to it rather than repeating it. A light with no guide of its own (airbags, stability control, power steering, seat belts) is covered here in full.

The answer in sixty seconds

Each row: the light, what the makers we read tell you to do, and the short verdict. "Four manuals" means Honda (2025 CR-V), Chevrolet (2024 Silverado 1500), Nissan (2025 Rogue) and Mazda (2025 CX-5); Toyota's words come from its owner website. Sources are in the sections below. The colour dots follow the verdict, not the lamp: several lights marked red are not required to be red by any rule.

Stop now, stop soon, or book a check: how the makers group them

Mazda's owner's manual does something the others leave implicit: it sorts its warning lights into groups by what the driver should do. Its first group is headed "Stop Vehicle in Safe Place Immediately" and opens "If any of the following warning lights turns on, the system may have a malfunction. Stop the vehicle in a safe place immediately and contact an Authorized Mazda Dealer." The lights in that group on the 2025 CX-5 are the brake system warning, the electronic brake force distribution warning (brake and ABS lights together), the charging system warning, the engine oil warning, the high engine coolant temperature warning and the power steering malfunction warning.

The second group, "Contact Authorized Mazda Dealer and Have Vehicle Inspected", holds the ABS warning, the check engine light, the automatic transaxle warning, the TCS/DSC (traction and stability) light, the air bag and seat belt pretensioner light, a flashing tire pressure light and driver-assistance warnings. The third, headed "Taking Action", holds lights with an action for the driver, among them low fuel, the fuel cap, low engine oil level, seat belts, an open door, and a steady tire pressure light (inspect the tires and adjust the pressure).

The other makers do not print those headings, but their instructions for the lights that matter most, side by side:

That last row reports what the manuals say, not a promise that the car is fine. Chevrolet says to have an airbag light serviced "right away", because the airbags "might not inflate in a crash"; for a steady stability light its wording is "Adjust driving accordingly".

What the federal standard actually says about colour

The rule that governs dashboard lights on passenger cars, multipurpose passenger vehicles, trucks and buses is Federal Motor Vehicle Safety Standard No. 101, "Controls and displays". It defines a telltale as "an optical signal that, when illuminated, indicates the actuation of a device, a correct or improper functioning or condition, or a failure to function", and its section S5.4.1 says the light of each telltale in its Table 1 "must be of the color specified for that telltale in column 6 of that table."

The table is published only as an image in the electronic Code of Federal Regulations (the current images come from a Federal Register rule of 3 January 2025), so we transcribed it row by row. Column 6, the colour column, contains these entries (plus yellow for trailer ABS and for heavy-vehicle stability control):

A note to the table allows two tolerances: "Blue may be blue-green. Red may be red-orange." So a brake light that looks orange-red on your dashboard can still be the red one the standard requires.

What is not in that list is the important part. Table 1 lists the engine oil pressure, engine coolant temperature, electrical charge and fuel level telltales, with their symbols and words ("Oil", "Temp", "Volts or Charge or Amp", "Fuel"), and leaves the colour column blank for every one of them. The standard requires those lights to be identified by the listed symbol or word if the vehicle has them; it does not say what colour they glow. The check engine light does not appear in the table at all: it belongs to the emissions rules, not to the safety standard (more on that below). And the airbag readiness indicator is required by a different standard, FMVSS 208, which says it "shall monitor its own readiness and shall be clearly visible from the driver's designated seating position" and sets no colour either.

The standard does set a floor: telltales for which red is required "must not be cancelable while the underlying condition for their activation exists" when they share a screen with other messages; a red brake warning you can swipe away would not meet the rule.

Why red usually means stop anyway

If the law does not colour the oil and temperature lights, why are they so often red? Because makers choose to show them that way, as their own material shows.

Toyota's owner website puts it in one paragraph: "Dashboard icons are displayed in a variety of colors, depending on the system and its status in a specific vehicle. Yellow icons indicate an item of importance (such as low fuel) but are not necessarily a warning. Red icons indicate a condition that requires immediate attention, such as an open door or low engine oil pressure. See your vehicle's Owner's Manual for more details." (Toyota warning lights page, read 30 September 2026.)

Nissan's 2025 Rogue manual groups its lamps as red, yellow and other. Red holds the brake, charge, engine oil pressure, seat belt and air bag warnings; yellow holds ABS, the check engine light, low tire pressure and electric power steering. Honda labels its brake indicator "(Red)" and "(Amber)", with different instructions for each (2025 CR-V indicator list).

So the colour code most drivers have absorbed is real, but for many lamps it is a convention, not a rule. Red generally means immediate attention, in Toyota's words, but read the symbol: Toyota's examples of a red icon are an open door and low engine oil pressure. Amber does not always mean "later": Honda's amber brake system indicator reads "Comes on while driving - Avoid high speeds and sudden braking. Take the vehicle to a dealer immediately." And the manual for your car is the authority, as Toyota's colour paragraph itself says.

How we checked, and what we could not open

On 30 September 2026 we saved as text FMVSS 101, 105, 108, 126, 135, 138 and 208, 40 CFR 85.2222 and CARB's OBD II fact sheet, transcribed the FMVSS 101 table images, and read the four manuals and Toyota's owner website named above.

What refused us. Ford's manual PDF and two ford.com support pages answered "Access Denied" (HTTP 403). Toyota's manual PDFs answered "AccessDenied" (HTTP 403), which is why Toyota's words come from its website, not a manual. Two 2026 GM manual addresses returned 404, so we used the 2024 Silverado manual. We did not work around any block; nothing is quoted from those sites.

What this means for you. Models and years differ even within a brand. If your manual says something different from this page, your manual wins.

The bulb check: why every light comes on at start

Turn the key or press the start button without starting the engine and much of the dashboard lights up at once. That is required, not a glitch. FMVSS 101 says a telltale "must not emit light except when identifying the malfunction or vehicle condition it is designed to indicate, or during a bulb check." The individual standards then require the check:

• Brakes. FMVSS 135, S5.5.2: all brake indicators must light as a check, automatically at ignition-on with the engine not running or by a single manual action.
• Tire pressure. FMVSS 138, S4.3.3: the low tire pressure telltale must illuminate as a check of lamp function at ignition-on.
• Stability control. FMVSS 126, S5.3.4 and S5.5.6: the ESC malfunction telltale and the ESC OFF telltale are both activated as a lamp check.
• Check engine. The federal OBD inspection procedure, 40 CFR 85.2222, fails a car at an emissions test "If the MIL does not illuminate at all when the vehicle is in the key-on/engine-off condition" (the MIL is the check engine light), even with no codes stored.

The makers turn this into a rule for owners. Chevrolet, on the brake light: "If it does not come on then, have it fixed so it will be ready to warn you if there is a problem." On the airbag readiness light: "If the light does not come on then, have it fixed immediately." Toyota's website: "Should a safety system light such as the ABS and SRS airbag warning lights not come on when you start the hybrid system, this could mean that these systems are not available to help protect you in an accident, which could result in death or serious injury."

The check engine light has a start-up display of its own that looks like a fault and is not. Honda: if the emissions readiness codes have not been set, it "will blink five times and then go off." Nissan: on for 20 seconds, then blinking for 10 seconds with the engine not running, means the car "is not ready for an emission control system inspection/maintenance test." Both mean the self-tests have not finished, typically after a battery disconnection or a repair (CARB, Chevrolet); see resetting the check engine light.

So the check worth doing is simple: switch on, engine off, and watch. A brake, airbag or ABS light that never comes on needs fixing, by Chevrolet's and Toyota's own wording.

Oil pressure light: stop the engine

All four manuals give the same first answer for the oil can symbol: stop the engine. It reports oil pressure, not oil level, and Honda warns that running the engine with low pressure can cause serious damage almost immediately.

• Honda (2025 CR-V shows it as a message, "Engine oil pressure low"): "Immediately park the vehicle on level ground in a safe place." Then stop the engine, wait about three minutes, check the level, add oil if needed, restart, and if the warning "does not disappear within 10 seconds: Immediately stop the engine and contact a dealer for repairs." Honda's notice: "Running the engine with low oil pressure can cause serious mechanical damage almost immediately." (Honda)
• Chevrolet (2024 Silverado 1500, uplevel cluster): "If the light comes on and stays on when the engine is running, it may not have adequate oil pressure." The caution box gives the steps: stop in a safe location and turn off the engine, check the oil level, add oil if it is low, restart, and "If the engine oil pressure light stays on for more than 10 seconds, turn the vehicle back off. Do not restart the vehicle."
• Nissan (2025 Rogue): "Stop the vehicle safely as soon as possible. Stop the engine immediately and call a NISSAN dealer." And a detail that matters: "The engine oil pressure warning light is not designed to indicate a low oil level. The oil level should be checked using the dipstick."
• Mazda (2025 CX-5): "Do not drive the vehicle with the engine oil warning light turned on." Mazda has a separate "Engine Oil Level Warning Light" in its "Taking Action" group, whose instruction is to add oil; the pressure light is in the stop group.

Can you keep driving? Not while the light stays on, according to any of the four manuals. Honda and Chevrolet describe one check-and-restart (Honda: if the warning disappears, "Start driving again"); if the light stays on after that, both say to stop the engine and contact a dealer. Our low oil pressure warning guide covers what causes it, from a failed sender to a failed pump, what each fix costs, and the recalls where the warning itself was the defect. That guide, which is not a maker instruction, is stricter (engine off and a tow); where your manual gives a restart check, the manual decides.

Engine temperature light: stop, and follow your manual's order

The thermometer-in-liquid symbol (or a message such as "Engine temperature too hot") means, in Toyota's words, that the engine coolant temperature is too high.

• Honda: the CR-V's message itself reads "Engine temperature too hot. Do not drive. Allow engine to cool." Honda's notice: continuing to drive with it "may damage the engine." (Honda overheating page)
• Chevrolet: "The engine coolant temperature warning light comes on when the engine has overheated. If this happens, pull over and turn off the engine as soon as possible."
• Nissan: "Never continue driving if your vehicle overheats. Doing so could cause a vehicle fire."
• Mazda: two stages on the same light. Flashing means the coolant temperature is extremely high: "Drive slowly to reduce engine load until you can find a safe place to stop the vehicle and wait for the engine to cool down." On steady: "This indicates the possibility of overheating. Park the vehicle in a safe place immediately and stop the engine."
• Toyota (website): "Immediately stop the vehicle in a safe place. Indicates that the engine coolant temperature is too high."

All five say stop. What they do not agree on is the minutes after stopping, and this is where your own manual matters. Mazda says park and stop the engine. Nissan says move off the road, shift to Park, "Do not stop the engine," turn off the air conditioner and set the heater to maximum hot with the fan on high, then turn the engine off if steam or coolant is escaping, if coolant is leaking or if the cooling fan does not run. Honda: if there is no steam, "Keep the engine running and open the hood" and check that the fan runs; if there is steam, turn the engine off and wait. Chevrolet's light page says turn the engine off as soon as possible, but its overheating section, for a warning with no steam, says turn the heater to the highest temperature and fan speed, pull off and "let the engine idle." PulsCar's own overheating guide, which is not a maker instruction, says switch the engine off; where your manual gives an idle-and-cool procedure, follow the manual.

Two warnings recur. Steam: Honda, "Do not open the hood if steam is coming out"; Nissan, "Never open the hood if steam is coming out." The cap: Honda, "Always let the engine and radiator cool down before removing the radiator cap"; Chevrolet, "Never turn the cap when the cooling system, including the pressure cap, is hot." A hot cooling system is under pressure; Honda warns the coolant can spray out, "seriously scalding you."

Can you keep driving? Not while the warning is on, by all five. Honda and Chevrolet describe resuming only after it clears; Chevrolet then says drive slowly for about 10 minutes and have the cooling system checked. The car overheating guide covers the causes, from a thermostat to a head gasket, and what each costs; see also overheating when idling and coolant leaks.

Red brake light: parking brake first, then the pedal

The red "BRAKE" light is the brake-system light whose colour the federal standard fixes as red. It is also shared: under FMVSS 135, S5.5.1, one indicator may report a gross loss of brake fluid or pressure, an electrical failure in the ABS, the parking brake being applied, brake lining wear-out, or failures in electric or regenerative braking. Under S5.5.5(b), one shared lamp must display the word "Brake".

So the first check is the one Honda prints: "Comes on while driving - Make sure the parking brake is released. Stop in a safe place and check the brake fluid level."

If the parking brake is off, the makers differ in tone but not in direction:

• Honda: "Depress the brake pedal lightly to check pedal pressure." If normal, check the brake fluid level at the next stop; if abnormal, take immediate action, using engine braking if needed. "If there is no resistance from the brake pedal, stop immediately in a safe place." (Honda)
• Chevrolet: "If the light comes on while driving, pull off the road and stop carefully." "If the light is still on, have the vehicle towed for service." The warning box: "Driving with the brake system warning light on can lead to a crash."
• Nissan: with the parking brake off, "stop the vehicle and perform the following": check the brake fluid level, and if it is correct, have the warning system checked. Its warning box: "Your brake system may not be working properly if the warning light is on. Driving could be dangerous. If you judge it to be safe, drive carefully to the nearest service station for repairs. Otherwise, have your vehicle towed because driving it could be dangerous." And: "If the brake fluid level is below the minimum or MIN mark on the brake fluid reservoir, do not drive until the brake system has been checked."
• Mazda: "Do not drive with the brake system warning light illuminated." It "indicates that your brakes may not work at all or that they could completely fail at any time."

Two of the four leave some room to drive on: Honda if the pedal feels normal (check the fluid at the next stop), Nissan if the driver judges it safe, with a tow as the alternative. Mazda and Chevrolet do not leave that room. If your manual is silent or you are unsure, the stricter reading is the safer one: stop, check the parking brake, check the pedal and the fluid, and have the car towed if the light stays on.

A flashing red brake light is usually a different message. Honda's red indicator blinks when "There is a problem with the electric parking brake system," and Chevrolet has a separate electric parking brake light that flashes for the same reason.

Can you keep driving? Not until you know which condition the light is reporting. Our brake light guide separates the four brake-related lights and walks through the pedal test. It is not a maker instruction; like Mazda and Chevrolet, it says stop and do not drive on while the red light stays on with the parking brake released, and where your manual says tow, follow the manual.

Brake and ABS lights together: a different fault

This combination is worth its own section because it means more than either light alone. Three of the makers spell it out:

• Honda: "If the brake system indicator (red) and ABS indicator come on simultaneously, the electronic brake distribution system is not working. This can result in vehicle instability under sudden braking." Have the car inspected by a dealer immediately.
• Mazda: "Do not drive with both the ABS warning light and brake warning light illuminated. Have the vehicle towed to an Authorized Mazda Dealer to have the brakes inspected as soon as possible." The reason: "When both lights are illuminated, the rear wheels could lock more quickly in an emergency stop than under normal circumstances."
• Chevrolet: "If both the ABS warning light and the brake system warning light are on, ABS is not functioning and there is a problem with the regular brakes. See your dealer for service."

Nissan's manual describes the same pair (with the parking brake released and the brake fluid level sufficient) as possibly indicating that the ABS is not functioning properly, and says to have the brake system checked.

Our ABS guide's triage for this pair now follows the stricter reading: stop, do not drive on, and on a Mazda follow its tow instruction.

ABS light alone: normal brakes, no anti-lock

The yellow ABS light, alone, is one of the few warnings on which all four manuals agree the car still brakes normally:

• Honda: "With this indicator on, your vehicle still has normal braking ability but no anti-lock function."
• Chevrolet: "If the ABS warning light is the only light on, the vehicle has regular brakes, but ABS is not functioning."
• Nissan: "If an ABS malfunction occurs, the antilock function is turned off. The brake system then operates normally, but without anti-lock assistance."
• Mazda: "your brakes will function normally as if the vehicle had no ABS." Mazda adds that "The brake assist system does not operate while the ABS warning light is illuminated."

What you lose is the anti-lock itself, which Chevrolet says "helps prevent a braking skid and maintain steering while braking hard." Its manual adds: "Always leave enough room ahead to stop, even with ABS." Honda, Nissan and Mazda all say to have it checked (Mazda: as soon as possible). If a recall covers your car, its letter comes first: our ABS light guide quotes a recall notice that says to pull over and turn the engine off when the ABS light comes with a burning smell or smoke.

Two innocent causes appear in the manuals. Mazda: when the engine is jump-started, "uneven rpm occurs and the ABS warning light may illuminate. If this occurs, it is the result of the weak battery and does not indicate an ABS malfunction." Chevrolet: on the Silverado, "Engagement of the 4WD front axle lock will disable ABS and illuminate the ABS warning light," and the light goes out when the lock is disengaged.

Our ABS light guide covers the causes (wheel speed sensors lead), the price ladder and the federal complaint file.

Battery or charging light: the car may stop

The battery symbol (Nissan calls it the charge warning light, Honda the charging system indicator) reports a problem with the charging system; Mazda names the alternator. Chevrolet says driving on could drain the battery, and Mazda that the engine could stop.

• Honda: "Stop in a safe place and have your vehicle checked by a dealer immediately." And: "If you need to stop temporarily, do not turn off the engine. Restarting the engine may rapidly discharge the battery."
• Chevrolet: "Driving while this light is on could drain the battery." "If a short distance must be driven with the light on, be sure to turn off all accessories, such as the radio and air conditioner. Find a safe place to stop the vehicle."
• Nissan: "Turn the engine off and check the alternator or starter generator (if so equipped) belt." And: "Do not continue driving if the alternator or starter generator (if so equipped) belt is loose, broken or missing."
• Mazda: "Do not continue driving when the charging system warning light is illuminated because the engine could stop unexpectedly."

The makers split on the engine: Nissan says turn it off to check the belt, Honda says do not turn it off during a temporary stop because a restart may drain the battery. The common ground is to stop somewhere safe soon. Only Chevrolet allows a short drive if one must be made, with all accessories off.

Can you keep driving? Not beyond a safe place to stop: Mazda says do not continue, Honda says stop in a safe place, and only Chevrolet allows a short drive. Our guide to a car battery that keeps dying separates a weak battery, a parasitic drain and a failing alternator; how to test a car battery covers the meter readings, and PulsCar's battery and alternator study covers what owners report.

Check engine light: steady or flashing, and where makers disagree

The check engine light is officially the malfunction indicator lamp (MIL), and it is an emissions rule, not a safety-standard telltale. California's air board describes it this way: when the on-board diagnostic system detects a malfunction, "the OBD II system illuminates a warning light on the vehicle instrument panel to alert the driver," and the light "will often include an engine symbol" (CARB OBD II fact sheet). The same fact sheet says EPA requires OBD on all 1996 and newer model year passenger cars and trucks.

Steady. CARB: "Most manufacturers advise having the vehicle serviced as soon as conveniently possible." The manuals:

• Honda: "Avoid high speeds and immediately get your vehicle inspected at a dealer."
• Chevrolet: "If this light is on while the engine is running, a malfunction has been detected and the vehicle may require service."
• Nissan: a steady light may indicate an emission control or CVT (transmission) malfunction, and "You do not need to have your vehicle towed to the dealer."
• Mazda: "It is important to note the driving conditions when the light illuminated and consult an Authorized Mazda Dealer." If it "remains on", do not drive at high speeds.

Three of the manuals name harmless causes. Chevrolet: a capless funnel adapter left in the filler neck, or poor fuel. Nissan: the light may come on steady "if the vehicle runs out of fuel," and should go off after a few trips. Mazda: "The fuel-filler cap is missing or not tightened securely," or the tank is very low.

Flashing. Honda and Nissan say a flashing light means an engine misfire has been detected; Chevrolet says a malfunction that could damage the emission control system. CARB: "This indicates that a malfunction is occurring that could be damaging your catalytic converter." Here the manuals give four different instructions:

• Honda: "Park the vehicle in a safe place with no flammable items and wait at least 10 minutes or more with the engine stopped until it cools." Then: "If the malfunction indicator lamp blinks again when restarting the engine, drive to the nearest dealer at 31 mph (50 km/h) or less."
• Chevrolet: "To help prevent damage, reduce vehicle speed and avoid hard accelerations and uphill grades." If the light keeps flashing, "find a safe place to park. Turn the vehicle off and wait at least 10 seconds before restarting the engine." If it is still flashing, see a dealer as soon as possible.
• Nissan: "Do not drive at speeds above 45 MPH (72 km/h)," avoid hard acceleration and steep grades, reduce the load, and "You do not need to have your vehicle towed to the dealer."
• Mazda: "If the check engine light remains on, or it flashes continuously , do not drive at high speeds and consult an Authorized Mazda Dealer as soon as possible."

The common instruction is to slow down at once. After that, Honda is the most conservative of the four (stop, cool, then a low-speed drive only if needed) and Nissan gives the longest list of conditions for driving on (under 45 MPH, no hard acceleration, no steep grades, no tow needed). PulsCar's own flashing check engine light guide, which is not a maker instruction, is stricter: pull over within a mile or two and shut the engine off, with a gentle drive under 40 mph only to a shop 2-3 miles away. If your manual allows more, it is the maker's call for its own engine; if it is silent, do what Honda prints.

Reading the code. The code can be read at many parts stores (what AutoZone's free scan includes) or with your own scanner (which scanner to buy); our code index lists the codes with full guides, and check engine light on covers the causes.

Tire pressure light: steady means low, flashing means the system

The tire pressure light is yellow by federal rule, and it is the light for which the standard writes out the sentence the manual must print. FMVSS 138 requires the system to light the telltale within 20 minutes of a tire falling to 25 percent below the maker's recommended cold pressure (or a floor in the standard's table, whichever is higher), and it requires this sentence in the owner's manual: "Accordingly, when the low tire pressure telltale illuminates, you should stop and check your tires as soon as possible, and inflate them to the proper pressure."

Steady means low pressure (on the Honda CR-V it can also mean the system has not been calibrated). The manuals add how to get to that check:

• Honda: "Drive carefully and avoid abrupt cornering and hard braking," then stop in a safe place and adjust the pressure to the label on the driver's doorjamb.
• Nissan: "reduce vehicle speed, pull off the road to a safe location and stop the vehicle as soon as possible."
• Mazda: "decrease vehicle speed immediately and avoid sudden maneuvering and braking."
• Chevrolet: stop as soon as possible and inflate the tires to the pressure on the Tire and Loading Information label.

Flashing, then steady means the monitoring system itself has a fault. The standard allows one lamp to do both jobs if, for a malfunction, it "Flashes for a period of at least 60 seconds but no longer than 90 seconds" at each start and then stays on. The required manual sentence for such cars: "the telltale will flash for approximately one minute and then remain continuously illuminated." Honda, Nissan and Chevrolet all describe about a minute of flashing; Nissan, Honda and Chevrolet add that a mounted spare can cause the same pattern. When the system is faulty, the standard's text warns, it "may not be able to detect or signal low tire pressure as intended," so check the pressures with a gauge until it is repaired.

Mazda names cold weather as one cause: a light caused by pressure dropping in the cold "may turn off if the ambient temperature rises. In this case, it will also be necessary to adjust the tire air pressures." And set pressures cold: Chevrolet and Nissan mean parked three hours or more, or driven less than a mile (Mazda says one hour). Our tire pressure light guide covers direct and indirect systems, resets and the recalls.

Airbag and seat belt lights

Airbag (SRS). FMVSS 208, S4.5.2, requires an airbag system to have a readiness indicator that "shall monitor its own readiness," and the makers explain what its lighting means. Chevrolet: "If the airbag readiness light stays on after the vehicle is started or comes on while driving, it means the airbag system might not be working properly. The airbags in the vehicle might not inflate in a crash, or they could even inflate without a crash. To help avoid injury, have the vehicle serviced right away." Nissan lists three fault signs: the light stays on after about 7 seconds, flashes intermittently, or does not come on at all. Honda says the indicator covers the airbags, the side and curtain airbags and the seat belt tensioners, and to have the car checked by a dealer. Mazda: "The system may not operate in an accident," and it warns never to tamper with the system yourself.

None of the four manuals tells the driver to stop the car for an airbag light. All four say to have it checked: Chevrolet says right away, Mazda as soon as possible, and Honda and Nissan say to have the car checked by a dealer. Until then, Chevrolet says the airbags might not inflate in a crash, and Nissan that they may not operate in an accident.

Front passenger airbag status. Chevrolet and Nissan cars show a separate indicator reporting whether the front passenger airbag is switched on or off by the seat's occupant sensing system. That is a status display, not a fault, unless (Chevrolet) both indicators stay on, none light at all, or the readiness light is on.

Seat belt reminders. FMVSS 208 requires a driver's seat belt warning. Under S7.3, one allowed design sounds a signal for "not less than 4 seconds and not more than 8 seconds" and shows the belt symbol or the words "Fasten Seat Belts" or "Fasten Belts" for "not less than 60 seconds" when the driver is unbelted at ignition-on. Nissan's reminder blinks with a chime "for over 1 minute" if the car is driven above 9 MPH (15 km/h) unbelted. A belt light that stays on with everyone buckled can be a sensor fault; Honda says have it checked by a dealer. Nissan notes that an object on the unoccupied front passenger seat can set it off.

Stability control, traction control and power steering

Stability and traction control. FMVSS 126 requires an ESC malfunction telltale (the car with wavy skid lines, or the letters ESC) and, if the driver can switch the system down, an ESC OFF telltale; both yellow under FMVSS 101. The standard allows the same lamp to flash for a different reason: "The manufacturer may use the ESC malfunction telltale in a flashing mode to indicate ESC operation." It may also light steady for malfunctions of related functions such as traction control.

So there are three states. Flashing briefly on a slippery road: the system is working. Chevrolet: "The light flashes when the TCS and/or the StabiliTrak/ESC system is actively working." Nissan's slip indicator blinks for the same reason: "The road surface may be slippery." Steady: a fault. Chevrolet: "If the light is on and not flashing, the TCS and potentially the StabiliTrak/ESC system are not fully operational and may not assist in maintaining control. Adjust driving accordingly." See a dealer if it persists. The OFF light: the system was switched down, by you or by a mode; the telltale must go out once the system returns to its full default mode.

One common false alarm is printed by Honda: the VSA light "Comes on if the VSA® system is deactivated temporarily after the battery has been disconnected, then re-connected." The fix: "Drive a short distance at more than 12 mph (20 km/h). The indicator should go off. If it does not, have your vehicle checked by a dealer." Honda's amber brake system indicator has the same note.

Electric power steering. None of the manuals we read says the steering stops working. Nissan: "the power assist to the steering will cease operation but you will still have control of the vehicle. At this time, greater steering efforts are required to operate the steering wheel, especially in sharp turns and at low speeds." Honda: "Stop the vehicle in a safe place and restart the engine. If the indicator comes on and stays on, immediately have your vehicle inspected by a dealer." If the display says "Do not drive", Honda says "immediately stop in a safe place and contact a dealer." Mazda says the steering "will not operate normally" and may feel heavy, puts the warning in its stop group and says not to operate the steering wheel while stopped; it also notes that jerking the wheel repeatedly while stopped or moving extremely slowly can put the system into a protective mode that makes it heavy for several minutes without any fault. Our guide to a steering wheel that is hard to turn covers the causes.

Transmission, the master warning and the lights you can fix yourself

Transmission. Honda's transmission system indicator "Blinks if the transmission system has a problem": have the car checked by a dealer immediately. Mazda: "Continuing to drive your Mazda in this condition could cause damage to your transaxle." See our guide to transmission slipping for what the symptoms point to.

Master warning. Many cars show a general warning light paired with a text message. Nissan: the master warning light "illuminates if a warning message appears in the vehicle information display." Toyota's site: "A buzzer sounds and the warning light flashes to indicate that the master warning system has detected a malfunction." The light itself does not say what is wrong; Nissan and Mazda both point to the message shown with it, so read that message.

Lights you fix on the spot. Several entries in Mazda's "Taking Action" group are: low fuel (about 9.0 L, 2.3 US gal, left on the CX-5), the fuel cap, low engine oil level, seat belts, washer fluid, an open door, liftgate or hood. Honda's low fuel indicator comes on at about 2.1 U.S. gal and blinks if the fuel gauge has a problem. These are warnings, not system faults.

Lights that are not warnings at all

A good share of what lights up is information. Among informational lights, FMVSS 101 fixes the colour of the high beam telltale (blue or green) and the turn signal telltale (green). The flashing ESC light is the system at work, and Toyota lists a "Slip Indicator" in the same way. Makers use green, white and blue for systems that are on: Honda's list includes drive mode indicators, a cruise mode indicator (white or green) and an auto idle stop indicator (green); Chevrolet shows lights for Tow/Haul Mode and each driver mode.

The practical test: a green, blue or white light usually describes a system that is on, as in the makers' lists above. If it is amber or red, or if it came on without you doing anything, find it in the manual.

What a warning light cannot tell you

A dashboard light only covers what a sensor is watching and what the maker chose to report. PulsCar's study of 777,040 NHTSA complaints found 64,831 that describe a car noise, and in 73.6% of those the owner reports no warning light, code or message. The study counts what owners wrote, so a missing mention is not proof that no light came on. Still, a quiet dashboard is not a clean bill of health.

The reverse also holds: a light names a system, not a failed part, and the makers' instructions above are about getting the car somewhere safe, not about the repair.

The traps: three ways a warning light costs more than it should

Trap one: reading the colour and not the symbol. The situation: an amber light comes on and the driver files it under "later". What is real: federal rules colour only some lights, and the makers do not treat all amber lights as minor. Honda's amber brake system indicator says avoid high speeds and go to a dealer immediately; a flashing check engine light can mean a malfunction damaging the converter (CARB); the yellow tire pressure light carries a federal instruction to stop and check. Meanwhile a red light can be the parking brake or, in Toyota's example, an open door. The price: driving on an amber light that meant "now". The defense: identify the symbol first, then the colour, then the manual.

Trap two: the light went off, so the problem went away. The situation: a light comes on, then goes out on its own. What is real: some conditions genuinely clear: Mazda says there is no problem if a light turns off, but to consult a dealer if it stays on or comes back. Others only look cleared. A tire pressure light from a cold morning may go out as the day warms, and Mazda says the pressures still need adjusting. The price: a slow leak or an intermittent fault that becomes a roadside failure. The defense: note the light, the time and the driving conditions (Mazda asks for the driving conditions), check the obvious item, and read the code if it was the engine light.

Trap three: making the light go away instead of fixing it. The situation: a light is on before an inspection or a sale, and someone suggests disconnecting the battery or clearing the code. What is real: Mazda's manual warns, "If the check engine light turns on, do not disconnect the battery cables. If the battery cables are disconnected and then reconnected, the engine could be damaged and catch on fire." California's air board says a car fails California's Smog Check if too many readiness indicators are incomplete since the memory was last cleared, and Chevrolet's manual says a car may not pass inspection if critical emission control systems have not been completely diagnosed, which can happen after the battery is replaced or run down, and that it can take several days of routine driving to become ready. Under the federal OBD inspection procedure (40 CFR 85.2222), a car whose MIL is commanded on fails. The price: a failed or refused inspection, and an unrepaired fault. The defense: fix, then clear, then drive normally before the test. Our check engine light reset guide and used car inspection checklist cover the details.

Three composite scenarios

These are composite scenarios, not individual customers. They are built only from the documents quoted above and are written in the conditional on purpose, with no invented names, amounts or dates.

Scenario 1: the oil can while driving. Suppose an oil can symbol came on while driving, the driver stopped in a safe place, and the dipstick showed a full level. Every manual on this page would still say stop: Nissan's says the light "is not designed to indicate a low oil level," and a full dipstick says nothing about pressure. The right next step would be the one Honda and Chevrolet print, a single restart; if the light stayed on beyond 10 seconds, the engine would stay off and the driver would contact a dealer, as both print. Lesson: the level and the pressure are two different checks.

Scenario 2: the flashing check engine light. Suppose a check engine light began to flash while driving. The manuals agree on slowing down at once. A Nissan owner would read: not above 45 MPH, and no tow needed; a Honda owner would read park, cool for 10 minutes, and, if it blinked again on restart, drive to the nearest dealer at 31 mph or less. The safer path, if the manual were not at hand, would be Honda's. Lesson: when makers disagree, follow your own manual; if it is silent, the most cautious one, since CARB says a flashing light means a malfunction that could damage the converter.

Scenario 3: two lights at once. Suppose the ABS light and the red brake light came on together, with the parking brake off. Taken one at a time, ABS alone would mean normal brakes without anti-lock. Together, Honda would say brake distribution is not working and Mazda would say do not drive and tow the car. Lesson: read the combination, not each light alone.

Where a free sound check fits, and where it does not

This is the part of the page about our own product, so check it against our site. PulsCar's sound check asks you to film your engine running for 30 seconds and returns a health report in about 10 minutes. The homepage terms are "No payment, no card, no subscription." If a clip cannot support a confident verdict, the homepage says, "your report honestly says “inconclusive”" rather than guessing.

It cannot do what a warning light does, and the honest way to say that is to list it. It does not read the car's computer, so it sees no codes, no tire pressures, no airbag or brake status and no coolant temperature. It cannot tell you whether it is safe to keep driving with any light on this page; for that, the maker's manual is the authority. It listens to a clip filmed with the engine running, so a sound that appears only on the move may not be in it, and it is framed around engine sound; it does not read brake, tire or steering systems.

Can a PulsCar sound check help when a warning light is on? Only alongside the steps above. If the oil pressure or temperature light is on, every one of the four manuals says stop, most say the same for the red brake and charging lights, and nothing about a phone recording changes that. Where it can add something is the other half of the problem this page described: the noise that arrives with no light, or the sound that remains after a light has been dealt with. PulsCar's own study found that most owners describing a noise to NHTSA mentioned no warning light at all. A 30-second clip, a free report by email and a second opinion before you pay a shop is the use it was built for. If a light and a noise appear together, deal with the light first by the manual, then check whether the sound points at the same system.

Every light with a full PulsCar guide

Which PulsCar guide should you open next? Start from the light, not from the part you suspect, and only after the stop-or-go decision above has been made by your manual. This hub deliberately stops at the question of what a light means and whether to keep driving. Most guides in the table below pick up from there for one light: what usually causes it, what a proper diagnosis looks like, what owners report paying and, where they exist, recalls, service bulletins and federal complaint data. Each quotes its own sources; most give prices, which this hub does not. Two lights have more than one guide because the answer splits: a flashing check engine light is a different emergency from a steady one, and a charging light can be the battery, a drain or the alternator (alternator replacement cost covers the last). The airbag, stability control and power steering lights have no guide of their own; this page is their reference.

What we looked for and did not find

Naming the gaps is part of the method; each of these was an actual search or request.

No federal colour for oil, temperature or charging lights. We read the whole of FMVSS 101 and its two tables. Column 6 is blank for those rows. If you have read that red is "required" for them, it is not in the standard we read on 30 September 2026.

No colour for the check engine light in the texts we read. CARB's fact sheet describes its typical words and symbol and the federal inspection procedure how it is tested; neither sets a colour. We did not read California's full OBD II regulation.

No Ford or Toyota owner's manual. Both refused our requests on 30 September 2026; Toyota's words come from its website, and nothing here is from Ford.

No universal list of symbols. FMVSS 101 permits any symbol for a lamp not in its tables, and makers add their own. No chart, including ours, covers every car.

No test of our own. We did not sit in the cars or trigger any light. Everything here is the text of the standards and the makers' own words, dated.

No heavy-truck detail. FMVSS 105 governs hydraulic brakes on vehicles over 3,500 kg (7,716 pounds) GVWR; this page follows FMVSS 135. The ABS light guide covers where heavy pickups differ.

Your plan: the next ten minutes, today, this week

The next ten minutes (the light is on now):

1. Identify the symbol and whether it is steady or flashing. Then the colour.
2. If it is oil pressure, engine temperature, a red brake light with the parking brake off, brake plus ABS together, the charging light or the power steering light: pull off the road (Chevrolet's and Nissan's words), clear of traffic, and switch the engine off only once stopped, unless your manual says otherwise (see each section).
3. If the check engine light is flashing: slow down at once and follow your manual; if it is silent, do what Honda prints: park, wait at least 10 minutes with the engine off, and if it blinks again on restart, drive to the nearest dealer at 31 mph or less, where the road allows that speed.
4. If the temperature light is on: do not open the hood if there is steam, and never open a hot radiator or coolant cap (Honda, Nissan, Chevrolet). Without the manual at hand, switch the engine off once stopped, as Mazda says.

Today: 5. Find the light in your owner's manual, on paper or on the maker's owner site. 6. Tire pressure light: check all four tires with a gauge, cold, and set them to the doorjamb label. 7. Check engine light, steady: read the code and write it down with the date and the driving conditions. 8. Airbag, ABS alone or stability control light: get it inspected (Chevrolet: airbag right away; steady stability light, adjust driving accordingly).

This week: 9. Do the bulb check: ignition on, engine off; the warning lights should come on, then go out after the engine starts (the parking brake light stays on while it is applied). 10. Check open recalls on your VIN at NHTSA's recall lookup. 11. Do not disconnect the battery while the check engine light is on (Mazda), and expect trouble at an inspection if codes are cleared just before one (CARB, for California's Smog Check: too many incomplete readiness indicators fail).

Why does PulsCar send you back to your own manual so often, instead of one rule for each light? Because the documents do not support one rule for each light. The federal standards fix the colour and symbol of some lamps, but except for tire pressure they do not tell drivers what to do. The makers do, and they disagree where it matters: whether to keep the engine running while an overheated car cools, whether a flashing check engine light means parking for ten minutes or driving on under 45 MPH, whether a red brake light allows a careful drive to a service station. What the documents do support is where all of them agree (stop for oil pressure and overheating, stop and check for a red brake light), which lights by law are what colour, and which PulsCar guides go deeper on each. Anything beyond that would be our opinion wearing a maker's authority.

Sources and documents

Every quotation above comes from one of these documents, each opened and saved as text on 30 September 2026 (the eCFR sections through eCFR's own text renderer). Pages that refused to open are listed as such and are not quoted.

1. 49 CFR 571.101, FMVSS No. 101, Controls and displays — telltales, bulb check, colours; Tables 1 and 2 transcribed from the Federal Register images ER03JA25 (rule of 3 January 2025)
2. 49 CFR 571.135, FMVSS No. 135, Light vehicle brake systems — brake warning conditions, function check, labeling
3. 49 CFR 571.105, FMVSS No. 105, Hydraulic and electric brake systems — heavier vehicles, lamp colours
4. 49 CFR 571.138, FMVSS No. 138, Tire pressure monitoring systems — 25 percent, 20 minutes, 60 to 90 second flashing, required owner's manual text
5. 49 CFR 571.126, FMVSS No. 126, Electronic stability control systems — malfunction and ESC OFF telltales, flashing mode
6. 49 CFR 571.208, FMVSS No. 208, Occupant crash protection — airbag readiness indicator, seat belt warning timing
7. 49 CFR 571.108, FMVSS No. 108, Lamps and reflective devices — cross-referenced by FMVSS 101
8. 40 CFR 85.2222, onboard diagnostic test procedures — MIL bulb check; MIL on fails
9. California Air Resources Board, On-Board Diagnostic II (OBD II) Systems Fact Sheet — the check engine light, steady and blinking, 1996 requirement
10. Honda, 2025 CR-V owner's manual (online): indicators, if an indicator comes on, how to handle overheating
11. Chevrolet, 2024 Silverado 1500 owner manual (PDF, GM) — Warning Lights, Gauges, and Indicators; Engine Overheating
12. Nissan, 2025 Rogue owner's manual (PDF, nissanusa.com) — warning and indicator lights; if your vehicle overheats
13. Mazda, 2025 CX-5 digital owner's manual: if a warning light turns on, stop vehicle in safe place immediately, contact dealer, taking action
14. Toyota, Warning Lights (owner website) — colour paragraph, common lights, safety system warning
15. PulsCar, car noise and warning lights study and its method file — 777,040 complaints, 64,831 describing a noise, 73.6% reporting no warning light
16. PulsCar homepage — the free sound check terms quoted above; PulsCar's single-light guides are linked in the text and in the table above, and each carries its own sources
17. Ford — 2025 F-150 owner's manual PDF (fordservicecontent.com) and two ford.com support pages: "Access Denied" (HTTP 403) on 30 September 2026, not quoted
18. Toyota — 2025 Sienna owner's manual and 2025 Camry quick reference guide PDFs (assets.sia.toyota.com): "AccessDenied" (HTTP 403), not quoted
19. GM 2026 Equinox and Silverado 1500 manual PDFs and EPA's OBD page: HTTP 404; Hyundai's manual portal: no readable text. None quoted
20. NHTSA recall lookup — linked for readers; nothing from it is quoted

How this page was built: rules on telltales, colours and bulb checks come from 49 CFR Part 571 and 40 CFR 85.2222, read in eCFR on 30 September 2026, with the FMVSS 101 tables transcribed from their images; instructions come from the makers' own owner's information, each quoted with the maker's name. Ford's and Toyota's manual servers refused our requests. The complaint figure is PulsCar's published study, cited with its limits. The scenarios are composite. Nothing here replaces your own owner's manual.

Prices verified: September 2026 (no prices are quoted on this page; each linked guide carries its own) · Technical documents verified: September 2026 · Reviewed quarterly

Found a light your manual describes differently from this page, or a maker's instruction we should add? Email [email protected] with the make, model, year and the page of the manual. A documented correction changes this page faster than anything we could write.