How to Jump Start a Car: Cable Order and Where Makers Differ

We make PulsCar, which has a free engine sound check. This page sells nothing and has no affiliate links. The only PulsCar offer mentioned is a free engine sound check, near the end, with its limits. Everything else is what other people print: car makers' owner's manuals and emergency-responder guides, battery and jump-pack makers, roadside clubs, state agencies and the federal recall data (downloaded 6 October 2026), read on 5 November 2026 and saved as text.

The question here is narrow. A car will not start, you suspect the battery, and a second car or a jump pack is within reach. In what order do the cables go, what must you never do, what changes on a hybrid or an electric car, and what if it still does not start? Why the battery died, the click patterns, the tests and the prices are other pages: our clicking no-start guide decodes the sounds, why a car battery keeps dying covers causes, how to test a car battery covers tests and car battery replacement cost covers the bill.

A jump-start is a short procedure, but it is not one procedure. We read the jump sections of owner's manuals from Chevrolet, Genesis, Hyundai, Infiniti, Kia, Mazda, Mercedes-Benz, MINI, Nissan, Polestar and Subaru; emergency-responder guides that Hyundai, Kia and Lexus publish for hybrids; pages from Optima, a battery maker, and Interstate Batteries, a battery seller, and from AAA; a fact sheet from Texas and a work procedure from North Carolina; and the user guides of two jump-pack makers. They agree on more than they differ, and the differences matter on one car in particular. Where they differ, this page says so, and the rule is simple: your own manual wins.

We could not read the manuals of Toyota, Honda, Ford, Jeep, Ram, Chrysler, Dodge, Tesla, Volkswagen, BMW (we did read MINI, same group) or Volvo. Their sites answered with a refusal, a service error or a form asking for a vehicle identification number, and we did not get around any of them. If you drive one of those cars, use this page for the questions to look for in your own manual.

Before you touch a cable: when the answer is not to jump this car

Look at the battery. Do not jump-start a battery that is frozen, cracked, bulging, leaking, low on fluid or smells of rotten eggs; have it replaced or serviced instead. Several documents print parts of that rule. Kia's Sportage page: "Do not attempt to jump start the vehicle if the discharged battery is frozen, as the battery may rupture or explode." Subaru: "Never attempt jump starting if the discharged battery is frozen. It could cause the battery to burst or explode." Texas's Department of Insurance lists "never jump start a frozen battery". AAA's national article: "Check the dead battery for any cracks or bulging sides." and "You must replace a damaged battery, not jump it." North Carolina's Department of Transportation, in a procedure for its own employees issued 1 September 2026, lists "The battery is cracked, leaking, swollen, frozen, or emitting a strong rotten-egg odor." as a reason to stop work. Mercedes-Benz: "A discharged battery may freeze at temperatures slightly above or below freezing point." Kia and Mazda also say not to jump a battery with a low fluid level.

Check the voltage and the kind of car. Nissan's Rogue manual: "The booster battery must be rated at 12 volts. Use of an improperly rated battery can damage your vehicle." Kia warns that a 24-volt supply can damage a 12-volt starter and ignition parts beyond repair, and AAA names the case: a 24-volt system from a commercial truck. If either car is a hybrid or electric, read the sections on those cars first. On a hybrid or electric car, jump-start only the 12-volt system, only at the connection points your owner's manual names; the high-voltage battery cannot be jump-started. Do not use a hybrid or electric car to jump another car. If your manual shows no jump procedure, call roadside assistance or the dealer.

Check the cables. Chevrolet's Equinox manual: "Always inspect jumper cables prior to use." Loose or missing insulation could shock you or damage the vehicle.

Ask whether you should be the one doing it. AAA's Central Pennsylvania club writes "We recommend not jumping your car battery yourself since many different things can go wrong." and says the roadside provider will likely use a jump box, which needs no second vehicle. Kia's Niro page says that if in doubt, it strongly recommends a competent technician or towing service.

Know the stop signs. North Carolina's work procedure says to stop and call maintenance if more than two jump-start attempts are required, if the same vehicle requires repeated jump-starts within 24 hours, if sparks, smoke, melting insulation or overheated clamps appear, or if the person is unsure of the jump terminals. It is a rule for fleet employees, not law for drivers. The logic travels: a car that needs a second jump in a day is telling you the battery or the charging system is the problem.

What you need: cables, a second car, or a jump pack

Jumper cables. None of the manuals we read prints a cable gauge or length; the car makers say where to clamp and little about what to clamp with, beyond condition warnings (Chevrolet, Subaru, MINI and Mercedes-Benz say to check for damaged or poorly insulated cables). The roadside and charger sources that print a size disagree. AAA's national article: "Look for a heavy-duty set of six-gauge, 16-foot cables." Battery Tender, a charger and jump-starter maker whose page we treat as one maker's view, prints "Minimum 4-gauge (2-gauge better for cold/diesels)" and "20-foot length minimum".

A second car. The helping car needs a 12-volt battery; Chevrolet's Equinox manual says "a negative ground system" too. If it is a hybrid or electric car, read the sections on those cars first.

A portable jump pack. AAA's Central Pennsylvania club calls jump boxes "the safer, more convenient option". North Carolina's Department of Transportation, for its own employees, makes UL-certified jump boxes (it defines them as meeting UL 2743) the required primary method, and says jumper-cable jump-starting is "restricted" and a last resort. That is a fleet policy, not a rule for drivers. A later section reads what two jump-pack makers print.

A charger. Optima, a battery maker: "The car battery is still deeply-discharged and needs to be fully-recharged to at least 12.6 volts with a battery charger as soon as possible." Interstate: "Jump leads do not charge a battery."

What to wear. Subaru says to wear suitable eye protectors and remove rings, bands or other metal jewelry whenever working around a battery; Hyundai: "Wear eye protection designed to protect the eyes from acid splashes." AAA: "Safety glasses aren't optional." The wording used on this page: wear eye protection, take off rings and metal jewelry, keep flames, sparks and cigarettes away, do not lean over the battery, keep the cars from touching and the clamps from touching each other, and keep hands and cables clear of the fan and belts.

The steps, in the order most manuals print

This is the shared order assembled from the pages we read. It is not any one manual and it does not replace yours. Use the connection points and the order in your owner's manual. Where you cannot read it, the order most of the manuals we read print is: red clamp to the dead battery's positive (+), red clamp to the good battery's positive (+), black clamp to the good battery's negative (-), and the last black clamp to a bare, unpainted metal ground point on the dead car, away from the battery. "Unpainted" is printed by Chevrolet's Silverado manual, AAA, North Carolina, Clore and, as not painted, Optima.

1. Find your manual's jump section and the jump points. Mercedes-Benz: "When charging the battery and during starting assistance, always use the jump-start connection point in the engine compartment." North Carolina's procedure says to review the manufacturer's instructions and identify the correct jump terminals first.
2. Park the cars close enough for the cables, but not touching. Kia's Niro page: "do not allow the vehicles to touch." Chevrolet's Equinox EV manual: if they touch, "a ground connection may occur that disables your vehicle and/or damages the electrical systems of one or both vehicles."
3. Set the parking brake and put both cars in Park (or Neutral on a manual). Kia's Niro: "Put the vehicles in P (Park) and set the parking brake. Turn both vehicles OFF." On a four-wheel-drive Chevrolet Silverado the transfer case must be in a drive gear, not N.
4. Turn off every electrical load in both cars. Kia's gasoline pages: "Turn off all unnecessary electrical loads." AAA says both ignitions must be completely off to prevent a voltage spike.
5. Open the hood or cover and look at the battery. Do not jump-start a battery that is frozen, cracked, bulging, leaking, low on fluid or smells of rotten eggs; have it replaced or serviced instead. Mazda also says "Remove the battery cover."
6. Red clamp to the dead battery's positive (+) or jump point.
7. Other end of the same red cable to the good battery's positive (+). Chevrolet's Silverado manual, after the first red clamp: "Do not let the other end touch metal."
8. Black clamp to the good battery's negative (-). Chevrolet: "Do not connect positive (+) to negative (-) or you will get a short that would damage the battery and maybe other parts too."
9. The last black clamp to the ground point on the dead car, away from the battery: a solid bolt or bracket fixed to the engine or body. Do not lean over the battery. Hydrogen is why. Hyundai: "Hydrogen is always present in battery cells, is highly combustible, and may explode if ignited."
10. Start the helping car and let it run for the time your manual gives, or a few minutes if it gives none.
11. Start the dead car. Nissan: "Do not keep the starter motor engaged for more than 10 seconds." If it fails, switch off and wait 10 seconds before trying again.
12. When it starts (Mazda, Mercedes-Benz, MINI and AAA say run both engines several minutes first), remove the cables in the reverse order: the black clamp from the ground point on the dead car, then the black clamp from the good battery, then the red clamp from the good battery, then the red clamp from the dead battery, keeping each loose clamp away from metal. Kia: "Disconnect the jumper cables in the exact reverse order you connected them:" Nissan and Polestar also name the black cables first.
13. Keep the engine running, then have the battery and charging system tested that day. The makers' times are in the table further down.

Chevrolet's Equinox manual: "If the jumper cables are connected or removed in the wrong order, electrical shorting may occur and damage the vehicle. The repairs would not be covered by the vehicle warranty."

Which red clamp goes on first: the manuals split

Most guides say "red to dead, red to good, black to good, black to ground". That is the order of the Kia, Hyundai, Genesis, Subaru, Mazda, Mercedes-Benz and Chevrolet manuals (Mercedes-Benz starts the helping car before the last clamp), of AAA, of the Texas fact sheet and of North Carolina's procedure. It is not the order of every source.

None of the pages we read says why the order differs, and each prints its own as the sequence to follow. Every source that gives an order ends with the clamp that matters most, the last one, the one that can make a spark. Optima: "Be sure to do this last, as there may be a small spark and you'd ideally like that to happen as far away from the battery as possible." AAA calls its order "a professional one designed to keep sparks far away from the battery". The Department of Energy's January 2006 safety bulletin, written after explosions of battery booster units, says venting hydrogen creates a potential explosion hazard when it accumulates, and that "ignition sources including sparks, smoking materials, and flames must be kept away from batteries."

The last clamp: where each maker puts it, and why it matters

A manual that says "a solid, stationary, metallic point away from the battery" leaves the choice to you. A manual that names a bolt takes the choice away, which is better if you have the manual and worse if you do not.

Most makers name a ground on the dead car and say, in some form, not the battery. Chevrolet's Silverado manual: "And do not connect the negative (-) cable to the negative (-) terminal on the dead battery because this can cause sparks." Hyundai: "A spark could cause the battery to explode and lead to a personal injury or vehicle damage." Kia: connecting the booster's negative cable to the discharged battery's negative terminal "can cause the discharged battery to overheat and crack, releasing battery acid."

Some makers name a specific part, Subaru the strut mounting nut and Infiniti the strut mounting bolt or the lift bracket, which helps on those cars only. And three documents print something else, each specific to its car: MINI's Countryman lists the negative battery terminal or the engine or body ground of the car being started; Kia's Optima plug-in hybrid guide, with its battery in the trunk, prints a negative terminal of the 12V battery; and the Lexus ES300h guide, also with a trunk battery, says to connect the negative cable to the negative terminal following a numbered sequence. They are the reason this page's rule starts with "use the connection points and the order in your owner's manual".

Is the helping car running, and for how long

The step that varies most is the one guides rarely mention: what the helping car's engine is doing while the clamps go on, and how long it runs before you try the dead car.

Read it in two halves. At the moment of connection, Hyundai and Genesis say turn both vehicles off (Mercedes-Benz instead has the donor running at idle while the last clamp goes on), Mazda says to turn off the booster's engine, Texas says to shut off both engines, MINI's preparation list says to switch off the donor's engine, and Polestar says to turn off that vehicle's motor. A manual that says nothing, such as Subaru's, is not saying "leave it running". Mercedes-Benz prints no wait before the dead car is started; it says to let both engines run several minutes afterward. For the wait, the numbers run from about a minute (Optima) through a few or several minutes (Hyundai, Kia's Sportage, Nissan, MINI) and three to five minutes (AAA) to at least four (Chevrolet's Equinox).

No car maker we read prints the reason for the first wait; AAA does (MINI gives one for the wait between attempts). It says to give the working car a solid three to five minutes "to build up a surface charge", and that holding the revs slightly above idle helps the alternator work faster. If your manual gives a time, use it. If not, the pages here support a few minutes, and none supports hurrying.

When the battery is not under the hood

Some newer cars put the battery in the trunk or the front trunk, and give the owner a marked jump point under the hood or in the trunk. Optima: "Some newer vehicles no longer have their batteries located under the hood."

Genesis's GV70 manual: "Your vehicle has a battery in the luggage compartment, but when you jump start your vehicle, use the jumper terminal in the engine compartment." Chevrolet's Equinox puts the positive terminal under a trim cover, its Equinox EV and Silverado EV put terminals under covers, and Mercedes-Benz and MINI send the owner to a jump-start connection point in the engine compartment. Polestar puts two charging points under a panel at the front. The Lexus ES300h guide that Toyota publishes for responders puts the 12-volt battery in the trunk and adds a trap: "The trunk opener will not operate if the auxiliary battery is discharged." It says to use the metal cut key hidden in the smart key.

Two sources give the rule behind those specifics. Chevrolet's Silverado manual: positive goes to positive "or to a remote positive (+) terminal if the vehicle has one". Clore's jump-pack manual: "Many vehicles feature alternate starting points, away from the battery." If you cannot find the points, stop and call: the manual names them, or the car should not be jumped by guesswork.

Hybrids and plug-in hybrids: the 12-volt battery only

A hybrid has a small 12-volt battery and a large high-voltage one, and a jump-start only ever concerns the small one. The makers' emergency-responder guides say so in nearly the same words. Hyundai's Sonata Hybrid guide: "Do not attempt to jump start the high voltage battery." Kia's Niro, Sorento and Optima plug-in guides say the high-voltage battery "cannot be jump started". The Lexus ES300h guide, published by Toyota Motor Corporation: "The high voltage HV battery pack cannot be jump started." The rule on this page applies unchanged: on a hybrid or electric car, jump-start only the 12-volt system, only at the connection points your owner's manual names; the high-voltage battery cannot be jump-started. Do not use a hybrid or electric car to jump another car. If your manual shows no jump procedure, call roadside assistance or the dealer.

The reset button on Hyundai's Elantra Hybrid, Tucson Hybrid, Nexo and Kia's Niro. Hyundai's Elantra Hybrid, Tucson Hybrid and Nexo manuals describe a 12-volt battery that is not a regular one: "This vehicle does not have a regular 12V battery that needs periodic replacement. It is lithium ion polymer type integrated into the HEV high voltage battery." If the 12-volt side has gone flat, the first step is a button, not cables. Kia: "Press the 12V Battery Reset button to reconnect the 12V battery." and "Start the vehicle within 15 seconds of pressing the 12V Battery Reset button." The same page warns that "Repeated use of the 12V Battery Reset button without a sufficient vehicle ON cycle (30 Min+) may cause over discharge of the 12V battery, which will prevent the vehicle from starting." Only if the reset does not work does the manual send the owner to cables. On a hybrid the reset also appears inside the jump list itself: Kia's Niro list says "For hybrid vehicle, press the 12V Battery Reset button." after the cables are on and before the helping car is started. Hyundai's Sonata Hybrid guide presses it later: cables on, helping car started, then the button.

Do not donate. Hyundai's Elantra Hybrid, Tucson Hybrid and Nexo manuals, its Sonata Hybrid guide and Kia's hybrid-edition page print versions of one warning: "Do not jump start another vehicle with your hybrid vehicle. Jump starting another vehicle will damage the hybrid vehicle's 12 volt battery". AAA says it generally: "Most hybrid and electric vehicles, however, have complex electronics that can be destroyed by jump-starting another car." Toyota's and Honda's manuals are among those we could not read, so the rule is this page's cautious one: we found no manual that allows it.

Electric cars: a jump wakes the car, it does not charge the pack

An electric car has a 12-volt auxiliary battery too. When it is discharged the car may not start: Mercedes-Benz's EQS manual says, for a discharged 12-volt battery, that the drive system cannot be started. The manuals treat that as a jump-start problem for the 12-volt system, apart from charging the traction battery.

Nissan's LEAF and Ariya manuals: "Jump starting provides power to the 12volt system to allow the electrical systems to operate." and "Jump starting does not charge the Li-ion battery. The Li-ion battery must be charged before the vehicle can be driven." They forbid mixing the two jobs: "Do not attempt to perform a jump start on the 12-volt battery at the same time that the Li-ion battery is being charged. Doing so may damage the vehicle or charging equipment and could cause an injury." Chevrolet's Equinox EV manual: "Charging the 12-volt battery and the high voltage battery at the same time may result in overheating or failure." and "If jumpstarting fails, see your dealer for service."

On a donor, the electric-car manuals are not uniform. Nissan: "LEAF cannot be used as a booster vehicle because it cannot supply enough power to start a gasoline engine. However, a gasoline engine vehicle can be used to supply power to the 12-volt battery of electric vehicle." Polestar: "The vehicle's charging points are only intended for jump-starting your own vehicle." Using them for another vehicle could blow a fuse and stop the charging points working. The Chevrolet EV pages do not say either way, which is why the rule on this page says not to use an electric car as the helping car. Of the manuals we read, none says it may be a donor.

The Mercedes-Benz EQS manual is the extreme case: no cable steps, and the owner is told to have starting assistance provided by a qualified specialist workshop. Its towing section lists, for a disconnected or discharged 12-volt battery, that the drive system cannot be started and the electric parking brake cannot be released or applied. Hyundai's IONIQ 5 guide covers the other end: when the high-voltage battery is fully discharged the car must be towed, and "Do not attempt to jump start the IONIQ 5 high voltage battery."

Start-stop and AGM batteries: what the makers print and what they do not

Cars with automatic engine stop-start can use a different 12-volt battery. This rests on Chevrolet's Silverado manual, which calls its battery an AGM (absorbent glass mat) battery. The honest answer to whether they need a different jump procedure is that no maker or battery maker we could read prints one.

What they print concerns charging and replacement. Chevrolet's Equinox manual: "use the AGM setting on the charger to limit charge voltage to 14.8 volts."

On jumping, the most direct sentence is from Interstate Batteries, a battery seller: "An absorbed glass-mat (AGM) battery holds charge differently than traditional batteries but can still be safely jump-started when done correctly." The car makers' jump sections do not mention AGM in the steps. So: the jump order in your manual is the order for your start-stop car; the charger you use afterward matters more than on an older car; and a start-stop car that needs repeated jumps is not a jump-starting problem. We found no page saying a start-stop car must be jumped differently and none saying it must not be jumped; that is an absence in the pages we could read, and Toyota, Honda and Ford are among those we could not open.

After it starts: what the makers say to do next

This is where the sources disagree most openly, and where the common advice, "drive for 30 minutes", turns out to come from some manuals and be rejected by one battery maker.

READY is the dash indicator that a hybrid or electric car is switched on and ready to drive, even when the engine is silent. Hyundai's Santa Fe manual gives the reason for its time: "to assure your battery receives enough charge to be able to start on its own after the vehicle is shut off." Optima takes the opposite view, and the page should not hide it. It has heard "really bad advice about just letting a car idle for a few minutes and/or driving the car for up to 30 minutes to recharge the battery after it's been jumped." Its answer: drive "as little as possible, as you seek out the nearest battery charger to fully-recharge your battery." Interstate says driving could recharge the car, but "you'd have to drive for hours at highway speeds and strain the alternator in the process." Two things to hold alongside that. Optima and Interstate sell batteries, and Optima sells chargers and ends its post by inviting readers to buy one. And the makers differ on what the time is for: Hyundai's gasoline manuals give it as what lets the battery start the car on its own, while the Kia and Hyundai hybrid manuals and Nissan's LEAF and Ariya say it is to charge the 12-volt battery (Kia and Hyundai: "fully"), and Optima's objection is that a drive does not do that.

The practical reading: run the car for at least the time your manual says (where a time is printed it runs from a few minutes at Chevrolet, Mercedes-Benz, MINI and Mazda to 20 or 30 minutes, 60 for a completely discharged battery on some Hyundai and Genesis cars, and, for the Polestar 2, at least 30 minutes at about 60 F, which can increase to 3-4 hours at lower temperatures), avoid shutting the engine off on the first errand, get the battery tested, and, if you can, charge it with a battery charger, which Optima, Texas and Polestar point to. Our battery testing guide explains the numbers and our guide to why a car battery keeps dying the causes. Interstate recommends a battery test to tell "whether you need a professional auto repair or a simple battery replacement". If you can name the cause (a light left on, a month parked), the jump may be the whole job. If you cannot, the test is.

If it does not start, or dies again

If the engine does not start after a few tries, stop: the manuals say the car probably needs service. Kia's Niro page: "If your vehicle will not start after a few attempts, it probably requires servicing." Chevrolet's Silverado manual: "If it will not start after a few tries, it probably needs service."

What counts as a try differs. Nissan's Rogue manual: "Do not keep the starter motor engaged for more than 10 seconds. If the engine does not start right away, place the ignition switch in the OFF position and wait 10 seconds before trying again." MINI says to wait a few minutes before another attempt so the discharged battery can recharge, and "Never use spray fluids to start the engine." North Carolina's work procedure caps an attempt at 20 seconds with a 2-minute cooldown and stops work after two failed attempts. AAA: "A car that still won't start after a third try likely has a completely failed battery that needs a full replacement." None of these is a law, and they differ; the shared message is that cranking harder and longer is not a plan.

The signs after a failed jump sort into cases the other guides here cover.

• Lights come on but fade fast, or the car clicks. Interstate: if the dashboard lights turn on but fade in less than a minute, the battery needs recharging before a jump will work. Click patterns are decoded in our clicking-when-starting guide.
• The engine turns over normally but does not catch. That is no longer a battery question; our car won't start guide sorts fuel, spark and sensors.
• It starts, and dies when the cables come off, or dies the next morning. The battery may not hold a charge, or the car may not be charging it. Our study of battery and alternator failure complaints and the alternator replacement cost guide are the next stops.
• Nothing at all happens. First check the clamps are on the right points. Polestar's manual says a blown fuse (the message "12 V battery fuse failure") stops its charging points working, and Kia's Niro and Hyundai's Elantra Hybrid, Tucson Hybrid and Nexo have the reset button to try first.

If the same car needs repeated jump-starts within 24 hours, North Carolina's procedure treats that as a stop-work trigger, and Optima describes the loop: a battery not fully recharged after a jump leaves the owner "slipping into a cycle of dead batteries and jump-starts". A third jump is the wrong response to the second.

Portable jump packs: what their own manuals add

A jump pack replaces the second car with a battery in a box. Some car makers say so: Kia's Niro page speaks of "a 12V booster pack or jumper cables from another vehicle's 12V battery", and Hyundai's hybrid and Nexo manuals use the same words. Few of the other manuals we read mention packs. The packs' own manuals add rules the cable guides lack.

The clamps. Here the pack manuals split from the car manuals. NOCO's guides say to connect the negative clamp to "the negative (NEG,N,-) battery terminal or vehicle chassis." Clore says to clamp the negative to a vehicle ground, "unpainted portion of the chassis or non-moving metal engine part", never to the fuel line. North Carolina's procedure for jump boxes says a clean, unpainted engine or chassis ground, "never the negative terminal of the dead battery". Where the pack's rule and the car's differ, the car's manual is the one to follow. Clore: "Turn ignition off before making any vehicle connections."

When the battery is nearly flat. A pack decides for itself whether to switch on. NOCO says its packs jump 12-volt lead-acid batteries "down to 2-volts"; below that the Boost LED stays off, and a Manual Override held for three seconds forces the pack on. The guide's warning: in override "BOTH THE SPARK PROOF AND REVERSE POLARITY PROTECTION FEATURES ARE DISABLED." Clore's unit does not activate when the battery is too low (under 1.0 V) or there is a potential shorted connection, and its override, held for over 3 seconds but less than 6, "removes all safety from the unit". Battery Tender's page lists a 0-volt reading as "DO NOT JUMP START", which is stricter than the "down to 2-volts" range and the override that NOCO and Clore describe (Clore adds that the owner must first check all connections and confirm the battery is totally dead). We do not choose between them: a pack owner should follow the pack's own manual.

How often. NOCO: "Do not attempt more than five (5) consecutive jump starts within a fifteen (15) minute period." Clore: if the car does not start within 6 seconds, let the unit cool for 3 minutes, and do not attempt after four attempts. These device limits come with the car makers' "few tries" sentence, not instead of it. NOCO also says to read the vehicle owner's manual first.

Recalls are real, and they are in the federal database. NHTSA's recall data file lists equipment recalls of jump starters. We read five records with report dates from 2015 to 2017: four equipment recalls of jump starters and one vehicle recall of a printed guide. Each covers certain units of one model, not a brand, and none is today's status.

All four jump-pack records describe an overheating or fire risk, one of them in the cable design, where over-cranking "will cause the cable to melt and the pack to overheat and catch fire." If you own a pack, look up its brand and model in the recall lists before you rely on it. We did not open NHTSA's recall page, and the Consumer Product Safety Commission's pages answered HTTP 403, so this section rests on the NHTSA data file.

Push-starting and tow-starting: the manuals say no

Kia's Sportage page: "Vehicles equipped with automatic transmission cannot be push-started, and only jump starting can be applied." Its Niro page says the same for dual-clutch transmissions. Nissan's Rogue: "Continuously Variable Transmission (CVT) models cannot be push-started or tow-started. Attempting to do so may cause transmission damage." Nissan's LEAF: "An EV (Electric Vehicle) cannot be push-started or tow-started. Attempting to do so may cause traction motor damage." Chevrolet: "Trying to start the vehicle by pushing or pulling it will not work, and it could damage the vehicle." Hyundai's Santa Fe adds a reason: "Push or pull starting the vehicle may cause the catalytic converter to overload which can lead to damage to the emission control system." Tow-starting has its own sentence from Kia: "Never tow a vehicle to start it." The reason: "When the engine starts, the vehicle can suddenly surge forward and could cause a collision with the tow vehicle."

The rule on this page: do not push-start or tow-start a car; the manuals we read say that automatic, CVT, dual-clutch and electric cars cannot be started that way. None of the pages we read prints a push-start procedure, and the Hyundai, Genesis and Kia pages tell the owner not to attempt it, so this page does not give one.

Does PulsCar change any of this? No. PulsCar has no view on cable order that differs from the manuals quoted here, and its free engine sound check, built on a 30-second clip of an engine that is already running, does not jump-start a car or test a battery. The check cannot tell you whether a battery is frozen or cracked, whether a clamp is on the right bolt, or whether a car can be pushed or towed to a start. The pages we read give those answers: the owner's manual for the connection points, the rule against push-starting or tow-starting a car, and a roadside service or a dealer when the manual shows no procedure. Treat this page as a guide to the questions to look for in your own manual, not as a replacement for it.

When the manual itself is wrong: a recall for a reversed diagram

Everything above assumes the manual is right. Federal recall data contains at least one case where it was not. NHTSA campaign 17V-433, reported by Chrysler (FCA US LLC) in 2017, covered certain 2017 Jeep Compass vehicles: "The affected vehicles have User's Guides that contain incorrect information regarding the jump start procedure, specifically, the polarity of the battery terminals are reversed in the battery terminal graphic." The record lists 12,989 vehicles, says the consequence was that "If a customer follows the User's Guide, they may hook up the battery jumper cables incorrectly, increasing their risk of injury." and says Chrysler would replace the User's Guides with a corrected version, free of charge, from 22 August 2017.

Two lessons follow, and they are ours, not NHTSA's. First, the markings on the battery or the jump terminal are the thing to check against the diagram: a plus sign, a minus sign, a red cover. If the picture in the manual disagrees with the markings on the car, stop and do not hook anything up; ask a dealer or roadside service. Second, "positive is red" is a convention and not a law. Interstate's own wording is "Clamp to the cars' positive terminals, usually red but not always."

Three ways a careful person still gets this wrong

Trap one: treating every car as the car in the video. The places the manuals split (which red clamp first, how long the helping car runs, what the last clamp is bolted to) are the places to read your own manual for, most of all on a car with its battery in the trunk, a hybrid, or an electric car. The defense: read the manual's jump section on a day the battery is fine, and photograph the jump points.

Trap two: the last clamp on the dead battery's negative post. Kia, Hyundai and Chevrolet each warn against it, and AAA's Oregon and Idaho club warns of a spark and an explosion. Make the last connection away from the battery, on the point your manual names, and do not lean over the battery. The printed exceptions (MINI; the trunk batteries of the Kia Optima plug-in and the Lexus ES300h) belong to those documents.

Trap three: calling the jump the repair. The battery that went flat on Monday goes flat on Tuesday. Optima describes the cycle of dead batteries and jump starts; North Carolina's Department of Transportation tells its own employees to stop on repeated jumps within 24 hours. The defense is a battery test the same day, as our guide on testing a car battery describes, and a look at what a replacement costs before the second dead morning, not after it.

Three composite situations, decoded

These are composite scenarios, not individual customers. They are built only from the manuals and pages quoted above.

Situation one: the cold-morning gasoline car. The car clicks and the dash is dim. A neighbour has cables. The manuals first ask for a look at the battery. Do not jump-start a battery that is frozen, cracked, bulging, leaking, low on fluid or smells of rotten eggs; have it replaced or serviced instead. This one looks normal. The cars are parked close but not touching, off, in Park, brakes on. The clamps go on in the order above, the last black one on the ground point the manual shows, not on the dead battery. The neighbour's car runs for the time the manual gives, the dead car starts on the second try, and the cables come off in reverse. The owner keeps the engine running and gets the battery tested that day.

Situation two: the hybrid with a flat 12-volt side. A hybrid does not respond, and the owner has no cables. The Hyundai Elantra Hybrid and Kia Niro pages say the first step is the 12V Battery Reset button, pressed, with the car started within 15 seconds, and not pressed again and again without a vehicle ON cycle of 30 minutes or more between. It works; the car goes to READY. The owner drives about 30 minutes, the figure those manuals print, and does not offer the hybrid as a helping car. Had the reset failed, the next step is a jump at the engine-compartment terminal; the high-voltage battery is never part of it.

Situation three: the electric car and the workshop. An electric car shows nothing. The manual has a jump section written for jumper cables, with terminals under a cover, and says nothing about packs; the owner has a jump pack, so the pack's own manual applies as well. The manual says not to charge the 12-volt and high-voltage batteries at the same time. If it instead says to call a workshop, as Mercedes-Benz does for the EQS, the call is the plan; it is not a failure to do it yourself.

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

This is our side of the page. PulsCar's free sound check asks you to film your engine running for 30 seconds and returns a report by email in about ten minutes. The home page states the terms plainly: "No payment, no card, no subscription." If a clip cannot support a confident verdict, the report says "inconclusive", and you can record again.

It has almost no role in the jump itself. A car that will not start has no running engine to film, and the check cannot tell you why a battery died, how charged it is, or whether the alternator is charging it. Where it can help is after the engine runs again: a new squeal, rattle or tick on the first drive.

Two limits belong with it. A sound that appears only on the road may not be in a clip filmed at the engine. And for a noise from the brakes, the steering or a wheel, or for any red or flashing warning light, the car needs a mechanic's inspection first, not a recording. If a red or flashing warning light comes on, or the brakes or steering feel wrong: pull over safely and switch the engine off; have the car inspected before it is driven on.

Can a free sound check tell me why my battery died, or whether the car will start tomorrow? No. PulsCar's free sound check listens to 30 seconds of an engine that is already running, so it cannot test a battery, a cable, an alternator or a charging system, and it reads no trouble codes. After a jump it can help with one narrow thing: a new squeal, rattle or tick on the first drive. The pages we read send the battery question elsewhere: to a battery test at a repair shop or battery store, which Interstate recommends, and to a battery charger, which Optima recommends over a long drive. Our guides on why a battery keeps dying and on testing a battery cover the causes and the numbers. For a noise from the brakes, steering or a wheel, or any red or flashing warning light, inspect first and record later.

What we looked for and did not find

• Many of the biggest makers. We could not read the owner's manuals of Toyota, Honda, Ford, Jeep, Ram, Chrysler and Dodge, Tesla, Volkswagen, BMW or Volvo (a refusal, a service error or a vehicle identification number form), and we did not get around any of them. We read MINI (BMW Group) and Polestar instead, and one Toyota-published emergency guide for a Lexus hybrid. "The makers" on this page means the makers we could read.
• Editions and model names. The Hyundai 2025 PDFs stopped answering, so the Hyundai hybrid manuals we cite are the 2022 and 2023 editions, and wording changes between editions (Hyundai's Elantra 2023 PDF has no step about the helping car's engine; its 2025 web page adds one). Kia's and Hyundai's web manuals do not print the model name on the jump page; we took the models from the codes in their addresses and name the Hyundai electric car only by its code, CE1.
• Retailers and government pages. AutoZone, O'Reilly, Advance Auto Parts, Batteries Plus, DieHard, Odyssey, NAPA, the Consumer Product Safety Commission and CDC's NIOSH were refused. We did not open NHTSA's recall web page; the recall facts come from NHTSA's recall data file.
• A separate start-stop procedure. No page we read says a start-stop car must be jumped differently, and none says it must not be jumped.
• A reason for the first-clamp split. The manuals that start on the dead car and those that start on the helping car do not say why; none says the other order is wrong.
• Weak sources. Battery Tender's page has figures that differ from others (a 0-volt rule, a cable gauge); Gooloo's blog hedges once on the final clamp; Texas's fact sheet is unclear in its removal step about which car's ground it means. Each is one source's view.
• No test of our own. We did not jump any car or test any cable or pack. Everything is as printed.

What could we not read for this page, and does PulsCar fill the gap? We could not read the owner's manuals of Toyota, Honda, Ford, Jeep, Ram, Chrysler, Dodge, Tesla, Volkswagen, BMW or Volvo, or the guides from AutoZone, O'Reilly, Advance Auto Parts and Batteries Plus, because those sites answered with a refusal, a service error or a form asking for a vehicle identification number, and we did not get around any of them. PulsCar does not hold those manuals either, and its free sound check says nothing about jump points. If you drive one of those cars, the best use of this page is the list of questions it asks: where the jump points are, whether the manual says to turn both cars off, which clamp goes last, and whether the car can be used as a helping car. Your own manual answers them; a dealer or a roadside service can read it for you.

Your action plan: before it happens, on the day, and after

Before it happens (ten minutes, on a day the car starts).

1. Open your manual to the jump-start section; note the jump points and whether it says to turn both cars off. Photograph the page.
2. On a hybrid or electric car, find the 12-volt reset button or jump point and read what the manual says about using the car as a helping car. Remember: on a hybrid or electric car, jump-start only the 12-volt system, only at the connection points your owner's manual names; the high-voltage battery cannot be jump-started. Do not use a hybrid or electric car to jump another car. If your manual shows no jump procedure, call roadside assistance or the dealer.
3. Decide what you will use: cables (check the insulation) or a charged jump pack (read its manual, check its model against the recall lists). Put the roadside-assistance number in your phone.

On the day.

1. Look at the battery. Do not jump-start a battery that is frozen, cracked, bulging, leaking, low on fluid or smells of rotten eggs; have it replaced or serviced instead.
2. Park the cars close but not touching, both off, in Park, brakes on, accessories off. Wear eye protection, take off rings and metal jewelry, keep flames, sparks and cigarettes away, do not lean over the battery, keep the cars from touching and the clamps from touching each other, and keep hands and cables clear of the fan and belts.
3. Use the connection points and the order in your owner's manual. Where you cannot read it, the order most of the manuals we read print is: red clamp to the dead battery's positive (+), red clamp to the good battery's positive (+), black clamp to the good battery's negative (-), and the last black clamp to a bare, unpainted metal ground point on the dead car, away from the battery.
4. Start the helping car and let it run for the time your manual gives, or a few minutes. Start the dead car without cranking more than about 10 seconds at a time (Nissan's limit).
5. If the engine does not start after a few tries, stop: the manuals say the car probably needs service. Do not push-start or tow-start a car; the manuals we read say that automatic, CVT, dual-clutch and electric cars cannot be started that way.

After.

1. Remove the cables in the reverse order. Keep the engine running for the time your manual prints (from a few minutes to 20 or 30 minutes where one is printed; up to 60 for a completely discharged battery on some Hyundai and Genesis cars; the Polestar 2 says charging time can increase to 3-4 hours at lower temperatures). If you can, use a battery charger, as Optima advises.
2. Get the battery and charging system tested that day, and stop jumping a car that needs repeated jump-starts within 24 hours.
3. If a red or flashing warning light comes on, or the brakes or steering feel wrong: pull over safely and switch the engine off; have the car inspected before it is driven on.

Sources and documents

The facts on this page come from the pages below, read on 5 November 2026 and saved as text, except where a date is given; advice marked as ours is ours. Quotes are as printed.

• Chevrolet: Equinox 2026; Silverado 1500 2025; Equinox EV 2026; Silverado EV 2025
• Hyundai: Tucson 2025 web page; Elantra 2025 web page; electric car, code CE1, 2025 web page; Elantra 2023; Santa Fe 2023; Elantra Hybrid 2023; Tucson Hybrid 2022; Nexo 2023; IONIQ 5 guide 2022; Sonata Hybrid guide 2024
• Genesis: GV70 2023
• Kia: Telluride 2024; Sportage 2025 and push-starting; K5 2026; Niro 2026 and pre-jump hybrid page; hybrid edition 2025, code MQ4KH
• Kia plug-in hybrid guides: Niro PHEV; Optima PHEV; Sorento PHEV
• Lexus (Toyota): ES300h guide
• Nissan and Infiniti: Rogue 2026; LEAF 2026; Ariya 2025; Infiniti QX60 2025
• Mazda: CX-5 2024
• Subaru: Outback 2024 and 2022 edition
• Mercedes-Benz: C-Class 2022 and EQS 2022 operator's manuals
• MINI (BMW Group): Countryman 2025; Polestar: Polestar 2 2025
• Roadside clubs: AAA, how to jump a battery; AAA Oregon/Idaho, jump-starting; AAA Central Penn, jumping a battery
• Battery and charger makers: Interstate Batteries, jump-start a car; Optima, how to use jumper cables, how long to drive after jumping and charger versus jump starter; Battery Tender, jump start safely (one maker's view)
• Jump-pack makers: NOCO, GB40 guide and GB70 guide; Clore Automotive, JNC325 manual; Gooloo, connect a jump starter (a seller's blog)
• Government, university and standards pages: Texas Department of Insurance, battery safety fact sheet HS20-006A; North Carolina Department of Transportation, SOP 11E-7 (issued 1 September 2026); Mississippi State University Extension, battery safety talk 2021; U.S. Department of Energy, safety bulletin 2005-15 update, January 2006
• NHTSA recall data file (flat file of recalls after 2010, downloaded 6 October 2026, rows read 5 November 2026): campaigns 17V-433, 15E-075, 15E-079, 16E-021 and 17E-047
• PulsCar: home page
• Attempted, access blocked or not loadable, not quoted: Toyota, Ford, Jeep, Ram, Chrysler, Dodge, Tesla and Volvo owner's manual hosts (refused); Honda's manual host (service error); Volkswagen and BMW manuals (vehicle identification number form); AutoZone, O'Reilly, Advance Auto Parts, Batteries Plus, DieHard, Odyssey, NAPA (refused); CPSC and CDC NIOSH pages (refused); NHTSA's recall web page was not opened, the recall rows come from the data file

Prices verified: this page prints no prices. Technical documents verified 5 November 2026: owner's manuals, emergency-response guides, maker and battery-maker pages, state and federal pages and NHTSA recall records. Written by PulsCar, which makes the free sound check.