P0404 in 2026: Stuck EGR Valve, Software, Sensor or Wiring — What 241 Documents and 1,390 Complaints Show

P0404 is the EGR code, and the quick answer is "carbon on the EGR valve." The documents rarely say that.

P0404 — printed by Honda as "EGR valve circuit range/performance problem" and by Chrysler for the 4.7L Ram 1500 as "EGR Position Sensor Performance" — says the engine computer does not see the exhaust gas recirculation (EGR) valve where it expects it: the valve was told to move and its reported position or its control circuit does not match. The EGR valve feeds a measured amount of exhaust back into the intake to cool combustion and cut emissions; most are opened by a small motor, and many report their position back to the computer. Its neighbors are P0401 (flow insufficient), P0402 (flow excessive), P0403 (control circuit) and P0405 and P0406 (position sensor low and high). Our P0401 guide covers the flow code, the Chevrolet Volt and the diesel EGR cooler recalls; this page covers the position and control side and does not repeat them.

We went through NHTSA's index of manufacturer communications for papers that name an EGR code or discuss the EGR valve, its sensor, its pipe or its cooler: 998 entries. We set aside heavy trucks and buses, papers that mention EGR only in passing and papers about the flow code alone, and read the rest: 272 files, 241 distinct documents once exact copies are set aside. We read 164 in full and compared 105 revisions and copies with them, and read 8 recall filings in full on top of that; 21 entries have no file. Of the 272 files, 22 name P0404 in their own text, 58 name P0401, 27 name P0402, 8 name P0405, 6 name P0407 and 6 name P0408.

We also went through 1,390 complaints from NHTSA's file, received from January 2015 through early October 2026, that name an EGR code in any spelling, or use the words EGR or exhaust gas recirculation, or cite the number of an EGR recall. Each was sorted twice, independently, by the same written rules; the two sortings matched on the main category in 88% of them, and the rest were settled by written rules. 1,296 describe an EGR fault, warning or repair on the owner's car; 94 do not. The number that matters most for this page: only 8 of those 1,296 print P0404 themselves, and 14 print P0404 or one of P0405 to P0409. Owners write "EGR valve", "EGR cooler" or a dash message; the code lives in the dealer papers.

Claims marked 🟢 rest on a document listed in the Sources section. Claims marked ⚪ are shop-price estimates or symptom descriptions carried from our repair guides. Owner-reported figures are what people told NHTSA, published with ODI numbers, and every complaint count here comes from the 1,390 complaints sorted twice and published.

Words on this page. Engine computer (ECM, PCM): the car's computer. DTC: a trouble code such as P0404. MIL: the check engine light. EGR cooler: a separate radiator for the exhaust that the EGR valve feeds back. Poppet: the plug-shaped part inside a valve. Bulletin (TSB): a maker's repair instruction to dealers, not a recall. Campaign, warranty extension: a repair program outside a safety recall, usually free for the covered defect. Part 573: a maker's official recall filing. Flash: a software update loaded into the computer. Relearn: the step that teaches the computer where "closed" is. Limp mode: reduced power the computer chooses. Pintle: the valve's stem. Freeze-frame: data saved with a code. ODI number: NHTSA's complaint number.

I built PulsCar after a $380 "full diagnostic" in Phuket in 2025 led to roughly $6,000 over six months across several shops (the story is on the About page).

What P0404 says: a valve that is not where it was told to be, not a verdict on carbon

What the code reports. 🟢 Honda prints the condition as "The MIL comes on with DTC P0404 (EGR valve circuit range/performance problem)." (13-095). Chrysler prints "P0404 - EGR Position Sensor Performance - (Exhaust Gas Recirculation)." for the 2012-2013 Ram 1500 with the 4.7L engine (09-010-16), and Nissan prints "DTC P0404 (EGR A CONTROL)" (NTB22-097) and "DTC P0404 (EGR VOLUME CONTROL VALVE)" (NTB21-092). The word that matters is range/performance or control: the computer is judging how the valve behaved, not naming what is wrong with it. That is why the printed causes below run from software to a wire.

What you feel. Often nothing but a light. 🟢 Nissan's 2021 bulletin for the Rogue applies only when the light is on and "There are no drivability concerns." (NTB21-092). Chrysler's paper describes "An occasional engine surge" and a hard start on the 4.7L Ram. Among the owners who wrote to NHTSA the bad cases are common: 468 of the 1,296 complaints describe a stall, a loss of power, a limp mode or a rough idle (complaints, not a failure rate), 34 an engine that would not start, started hard or died soon after starting, and NHTSA's form records a fire in 73, a crash in 12 and an injury in 11. Most of the fire flags (69 of 73) are on Ram, Jeep and BMW cars, the makes behind the diesel EGR cooler recalls.

Is P0404 usually a clogged EGR valve, and how often does a new valve fix the car? PulsCar went through 1,390 complaints from 2015 to early October 2026 that name an EGR code or describe an EGR fault, each sorted twice by the same written rules: 1,296 on the owner's car, and 8 print P0404. A valve is the named or replaced part in 359 of the 1,296, and in 130 of those 359 the owner says the problem came back; only 36 are sorted as carbon or a blocked passage. These are complaints from owners who wrote to NHTSA, so they show how often owners say a replacement did not hold, not how often a valve fails. The documents are less valve-centered: the printed causes include software, a valve defect from the factory, soot on the valve pintle, a damaged wire and a cause nobody has found. Ask about software and your VIN before you pay for the part.

First: P0404, P0401, P0403, P0405, P0407 or a maker code? One valve, many labels

Read the exact code before you buy anything, because the same valve carries different labels in different makers' papers, and the neighboring codes point to different fixes.

Two cautions. 🟢 Hyundai's own recall text prints the code as "P404", not P0404, in the list of lights that can come on (recall 24V-308); do not search only for the zero. And a set of codes that includes P0407 or P0408 can be a chain: FCA's case record for those low-pressure codes says the computer may leave the valve "either open or closed during the wrong times which can lead to the other DTCs or drivability concerns."

The maker atlas: who prints a reflash, a new valve, a harness repair or a cleaning

The documents split by maker, and the split is the most useful thing in these papers: a 2021 Rogue with a lit light and nothing else and a 2024 Elantra that loses drive power are on different roads. Document numbers link to the NHTSA PDF.

The surprise is how little carbon the P0404 papers print. 🟢 The printed causes are software (Nissan, FCA T23, and the 18-001-22 flash that lists P0404 among 12 codes), an internal valve part damaged by commanded lift (Honda), soot on the pintle (only the Ram 4.7L extension letter), a sensor contaminated at the factory (Hyundai) and an unknown (Jaguar Land Rover). The cleaning papers belong to neighboring symptoms, not to P0404.

The do-not-replace lines: what the papers tell a shop not to buy first

Papers that say do not buy a valve first. 🟢 Mercedes, for the Sprinter diesel: clean first, replace only if the problem persists or the blades are seized (LI14.20-N-073867). 🟢 FCA, for the cooled EGR assembly on 2014-2015 6.4L Ram trucks, asks dealers to ask first (it is not a ban): "Please contact engineering prior to replacing any components if the vehicle has a P1404, P0404, P0405, or P0406 DTC code." The paper adds that engineering wants freeze-frame data and "If no response in 15 minutes, proceed with repair." (GPOP 04627465A). 🟢 FCA, for the low-pressure EGR codes: "concentrate diagnosis on the P0407/8 first before diagnosing any other codes." (S2025000005). 🟢 Toyota, for the connector pin: "The wire harness should NOT be replaced as part of the Repair Procedures." (T-SB-0023-26).

Papers that do say replace the valve (Honda, Ram 4.7L, and the Hyundai, Kia and Ford campaigns and recalls) name a cause: a damaged internal part or a known defect. A P0404 with no stated cause is not in that group.

Stuck open, stuck closed: what the papers say you feel

Stuck open. 🟢 FCA's recall text: "An EGR valve that becomes stuck open may cause an unexpected loss of motive power during low load conditions." (Z31 / 22V-284), and the supplier's filing blames a washer inside the valve that may come loose (BorgWarner 22E-051). Ford's filing for its detached poppet head lists "weak acceleration, engine vibration, a no start condition, or a check engine light" and says power loss is likely at low speeds, 20 kph (about 12 mph) or below in the Part 573 and 15 mph or below in Ford's owner letter (26V-122). BMW's fault list for the N57T separates the two directions: "272F00 - Exhaust-gas recirculation valve, plausibility: mechanically faulty, near open position" and "272E00 - Exhaust-gas recirculation valve, plausibility: mechanically faulty, near closed position", with jerking or idle fluctuations as the symptom (SI B01 14 18).

Not closing. 🟢 Mazda's paper describes the opposite of a stuck-shut valve: "carbon deposit etc. pinched at the valve seat prevents the valve from closing completely", and the symptom is a rough idle with a misfire code (01-001/21).

Stuck closed. ⚪ Our check-engine-light guide splits stuck open (a rough idle that smooths above about 1,500 rpm) from stuck closed (pinging under acceleration, may fail an emissions test); no maker paper we read prints that split.

The 10-minute check

Everything here is our advice; none of it needs more than a code reader.

1. Write down the whole code list, not only P0404. A P0404 beside P0401 on a Nissan Sentra points to software, and a P0404 alone on a 2016-2017 Grand Cherokee, Durango or 2017 Pacifica with the 3.6L engine, built in the window, points to notice T23; with P0405 (or P0642 or P0652) on a 2024 Hyundai or Kia, to the recall and the campaigns; with P0407 or P0408 to the low-pressure system; with misfire codes on a Mazda, to a valve that does not close.
2. Write down what the car does (nothing but a light, a rough idle, a surge, a hard start, "Power Reduced") and the temperature (Nissan's Altima paper is for a code stored below 32°F; its 2021 Rogue and Sentra papers for a light with no drivability concerns; its 2025 Rogue bulletin NTB25-008 also for Power Reduced).
3. Key off, check that the EGR valve's plug is pushed fully in, dry and clean.
4. Ask the dealer about the VIN. "Does this VIN have an open recall, a campaign or a software update for P0404?" costs nothing.

Five P0404 situations, and which is yours

1. A steady light, the car drives normally (Routes 1 and 2). Ask for software and a VIN check before parts.

2. A cold-weather light on an Altima, or a lit light with nothing to feel on a Sentra or a 2021 Rogue (Route 1). Nissan prints a reflash for P0404 below 32°F on the Altima, and for the 2021-2023 Rogue with the KR15DDT engine a reflash for the Power Reduced warning too.

3. A 2012-2013 Ram 1500 4.7L with a surge and a hard start (Route 5). Chrysler's paper replaces the valve if P0404 is found, but the 6-year extension has run out (see the coverage table).

4. A 2024 Elantra, Venue, Kona, Tucson or Sonata, or a 2025 Ford with Power Reduced or no drive power (Route 2). Hyundai's recall 260 and Ford's recall print a risk of lost drive power; Hyundai's campaign 9B3 and Kia's SC320 (2024 Carnival, Sportage, Niro) are emissions campaigns that print a lit light and no stall risk, and SC320 prints no price, so ask the dealer whether it is free for your VIN. Call the dealer today; do not wait for a stall.

5. A lit light or a restricted-performance warning with P0404 on a Land Rover or Jaguar diesel (Route 4). The maker says the cause is unknown; the printed steps are circuit, connector and leak checks and a routine, not a part.

The P0404 price ladder, from the bottom up

Figures marked ⚪ are published estimates from our repair guides, not quotes; owner figures are what people told NHTSA. Prices vary by engine and shop.

The ladder is a rule of thumb for order, not a forecast. A diagnosis fee is not a repair, and several of the costliest figures are quotes, not bills, and some were for a part that was not yet available.

The five P0404 routes, cheapest first

Each route below is one reason the valve can miss its command, ordered by what it costs to rule out. Owner counts come from the 1,296 relevant complaints; "came back" means the owner says the same light, code or symptom returned or the repair did not hold. These owners are the ones whose trouble did not end, so none of these shares is a forecast for your car.

Route 1 · Software and cold-weather cases — $0 to ask

What it is. The computer stored a P0404 for a condition a software update changes: a valve seated too hard, a cold start below freezing, a lit light with nothing wrong to feel.

What the documents say. 🟢 FCA's notice T23 puts it in one line: "An aggressive seating velocity may damage the EGR valve." and the fix is "The PCM must be reprogrammed on all involved vehicles." with "No parts are required to perform this service procedure." (T23). 🟢 Nissan's Altima bulletin ties the code to the weather: "DTC P0404 (EGR A CONTROL) is stored in the ECM at temperatures below 32°F." and its fix is a reprogram followed by "Throttle Valve Closed Position, Idle Air Volume Learning, Accelerator Closed Position, and DTC Erase" (NTB22-097). Honda pairs a software update with a new valve (13-095).

What the owners report. 33 complaints end at a recall, a campaign or a software update with no part named, and 22 of them say the problem came back; 23 end at a shop that found nothing or only cleared the code, and 4 of them say it came back. A 2019 Altima owner wrote that the car showed "ENGINE MALFUNCTION, REDUCE POWER, SERVICE NOW", that it "SHAKES, FEELS LIKE IT WILL STALL ESPECIALLY WHEN STOPPED AND JERKS", that a reader gave "P0404", and that "MY VIN DOES NOT SHOW THIS RECALL." (ODI 11693179). Another 2019 Altima owner wrote that the "Ice deposits physically verified by dealer" in the EGR valve produced a limp mode when parked outdoors "below 0F" and that warming up the engine and restarting cleared it (ODI 11498822). Nissan's bulletin states no cause; the ice is that owner's account of what the dealer found.

The cheap cause that gets skipped. The word "bulletin". Nissan's paper is a technical bulletin, not a recall, so a recall search on your VIN will not show it; the Altima owner's sentence about the recall is exactly the trap. Ask the dealer whether there is a bulletin or software update for P0404 on your VIN and which ECM part number the car has.

What you can do. Nothing with tools. A reflash needs a dealer's equipment and, in Nissan's text, a battery maintainer holding 12.0 V to 15.5 V and a relearn afterwards. What you can do is write down the code, the temperature and what the car did, photograph the reader screen, and do not clear the code before the dealer has read it (our advice).

At the shop — say this: "The light is P0404. Is there a technical bulletin or a software update for this code on my VIN, and does my ECM part number match the list? I would like that checked before any part is ordered."

Route 2 · Recalls, campaigns and warranty extensions on your VIN — $0

What it is. The valve itself has a known defect, the maker has said so in writing and the repair is free. This is where the recent papers are.

What the documents say. 🟢 FCA's recall for a valve that may stick open on about 1,360 vehicles: "An unexpected loss of motive power can cause a vehicle crash without prior warning.", remedy "Replace the EGR valve." followed by the learn procedure (Z31 / 22V-284); the supplier's equipment recall covers 2,217 valves (22E-051). 🟢 Hyundai's recall 260: a sensor "contaminated with solder flux during manufacturing" and "a sudden loss of motive power during operation" (24V-308). 🟢 Ford's 26V-122, filed March 3, 2026 and amended June 9: loss of motive power "likely at low speeds of 20 kph or below", with the Part 573 line "Consumer Advisories: Do Not Drive Park Outside" (26V-122); Ford's concern review group "could not rule out the possibility a stall (versus a reduction in power) occurred at higher speed". Ford's owner letter of July 2026 says "Ford has not issued instructions to stop driving your vehicle under this safety recall." and "A remedy is available. Parts are available to repair your vehicle.", with power loss "likely at low speeds of 15 mph or below"; it replaced Ford's June plan to send remedy letters in late September.

What the owners report. Ten relevant complaints cite recall 26V-122, five refer to the Hyundai recall (four by its number, 24V-308) and one cites 22V-284. Seven of the ten Ford ones say the recall part is not available yet, and six describe a stall, a loss of power or hesitation. A 2025 Ranger owner described "sudden and complete loss of accelerator pedal response while driving at low speed" (ODI 11733498), which matches Ford's filing, although this owner says their VIN is not in the recall and no code was stored. A 2025 Escape owner wrote that the car "stalled" while turning and that the recall part "was not yet available" (ODI 11727254). A 2024 Kona owner wrote that the failure resembled the solder-flux recall "but my Vehicle was not Included in this Recall." (ODI 11587541). A 2021 Venue owner was told the dealer "can't get it covered under warranty without a code present" (ODI 11616030).

The cheap cause that gets skipped. A VIN check you have not done. The recall windows are narrow (Hyundai's run for weeks; Ford's valve production window ran from August 24 to October 16, 2024). Enter your VIN at nhtsa.gov/recalls; it is free.

What you can do. Nothing yourself. For a 2025 Ford or Lincoln in recall 26V-122, Ford's two papers disagree on driving, so take the stricter reading (our advice): park it outside, call the dealer today and ask whether the car may be driven or must be picked up or towed; until the dealer says in writing that it may be driven, do not drive it except to the dealer, and do not pull a trailer. For a 2024 Elantra, Venue or Kona in recall 260 with the light on or after a loss of power, Hyundai's dealer guidance says "do not attempt to drive the vehicle further until the remedy is applied": ask for a tow. Ford says the remedy has been available since July 2026, although one owner still reported a backorder on September 3, 2026.

At the shop — say this: "Please run my VIN for open recalls and campaigns on the EGR valve. If one is open and the part is not in, I would like the date in writing and your advice on whether the car may be driven until then."

Route 3 · Soot, carbon and the valve that will not close — $8 to $1,200 for the cleaning

What it is. Deposits keep the valve from reaching its commanded position, or from closing, and the computer sees the mismatch. The printed cases are mostly for neighboring codes.

What the documents say. 🟢 Mazda's paper for the 2018 Mazda6 and the 2016-2021 CX-9 turbo cars: "carbon deposit etc. pinched at the valve seat prevents the valve from closing completely." and "check the EGR valve and clean the carbon deposit if it prevents the valve from closing.", replacing the valve only "If damage is found on the valve seat in the EGR valve" (01-001/21). 🟢 Mercedes for the Sprinter OM642 diesel: "Increased friction between the EGR Valve blade and seat due to soot deposits", with a cleaning first and a repeat-visit rule (LI14.20-N-073867). 🟢 Chrysler's letter for the 4.7L Ram 1500 says the valve pintle "may accumulate soot and under certain conditions, could stick" (D-16-15).

What the owners report. 36 complaints end at carbon, soot or a clogged passage or a cleaning, and 13 say the problem came back; 21 describe a stall, a power loss or a rough idle. The Sprinter owners are the loudest: "I have had to have the EGR valve cleaned out 4 times in 18000 miles." (2022 Sprinter 2500, ODI 11604674); another wrote "Cleaning the EGR valve fixes both symptoms." (ODI 11501149).

The cheap cause that gets skipped. Whether the valve was taken out and looked at. ⚪ Our check-engine-light guide puts a can of cleaner at $8 to $15 and says to clean before replacing; Mazda and Mercedes say the same for their own valves. One owner names $1,200 for a valve cleaning.

Fix it yourself. Only where the paper for your car allows a cleaning, with the key off (our advice). Mazda's paper adds a software step that makes the computer learn the closed position again, so a can of cleaner alone may not end it on that car; Mercedes requires the EGR cooler to be cleaned in the same visit. Do not pry open an electronic valve.

At the shop — say this: "Was the valve removed and inspected for carbon before it was condemned, and did you relearn the closed position afterwards?"

Route 4 · Wire, connector, harness and the short — $0 under a maker paper

What it is. The valve is fine and its feed is not: a harness rubbing a pulley, a loose pin, corrosion in the plug, or a short inside the valve that also takes down another part on the same circuit.

What the documents say. 🟢 Kia's PS554 for 2017-2018 Niro cars produced before August 21, 2017 says the cause of P040400 "may be related to a shorted A/C Pressure Transducer Wiring Harness (B) as a result of interference with the engine drive belt idler pulley", and the fix is a repaired, re-routed harness (PS554). 🟢 Toyota's 2026 bulletin for the Camry and RAV4 (P140018) says "a loose C90/C27 connector pin at the EGR valve may be found" and says "The wire harness should NOT be replaced as part of the Repair Procedures." (T-SB-0023-26). 🟢 FCA's case record on P0403 says to "Closely inspect all connections for loose, damaged, or pushed out pins and repair as necessary." (S2118000015), and Jaguar Land Rover's steps for P0404-77/84 include a circuit check for a short to ground, a short to power, an open circuit or high resistance (SSM73201).

What the owners report. 13 complaints end at a wire, a connector or a fuse, 9 of them with a stall, a power loss or a rough idle, and only 1 says it came back; four of those 13 are Chevrolet Volts, covered in our P0401 guide. A 2020 Silverado owner wrote that a warning said the truck would be limited to 65 mph and that this was "due to a faulty EGR wiring harness that controlled the EGR sensor." (ODI 11477857). A 2022 Tucson Hybrid owner reported "visible corrosion found within the EGR connector and extension harness" (ODI 11754790), and another Tucson Hybrid owner was told it was "the egr valve and sub harness" (ODI 11666187).

The cheap cause that gets skipped. The plug, and what the harness touches: the cheapest rung and the one most often skipped, because the valve is the part with the code.

Fix it yourself. Look, do not repair: with the key off, check that the valve's plug is clicked home, dry and not corroded, and that the harness is not rubbing a pulley, a bracket or the hot EGR pipe (our advice). A terminal repair is a shop job.

At the shop — say this: "Before you replace the valve, can you show me the voltage and the ground at the connector and tell me that the plug and harness are clean, tight and not rubbing anything?"

Route 5 · The valve itself, and the sensors that feed it — $250 to $4,000

What it is. The valve or its sensor has failed and has to be replaced. This is the largest single group among owners with a stated repair: 384 of the 855 complaints that name a cause or a repair (45%) name a valve or a sensor.

What the documents say. 🟢 Chrysler for the 4.7L Ram 1500: "Replace the EGR valve if code P0404 is found - EGR Position Sensor Performance was found." (09-010-16). 🟢 Honda, for the 2011-2014 Odyssey: "Replace the EGR valve and update the PGM-FI software." (13-095). 🟢 GM, for P0402 on 2024-2025 Duramax trucks, has the dealer inspect the valve's learned minimum position and replace the valve if it is above 22% (25-NA-059), and Ford, for P0402 on hybrids: the dealer diagnoses the code and replaces the differential pressure sensor if required, free for 15 years or 150,000 miles (25M03). 🟢 After a new FCA valve: "perform the EGR Valve Replaced learn procedure." (22V-284).

What the owners report. A valve is the named or replaced part in 359 of the 1,296 complaints and an EGR sensor in 25. In 130 of the 359 the owner says it came back; leaving out the Chevrolet Volt, 112 of 223. 214 of the 359 describe a stall, a power loss or a rough idle. A 2022 Sorento Hybrid owner, told of an internal short in the EGR control unit (P0404, P049D), wrote that the dealer was "claiming the EGR is not a powertrain component" (ODI 11710558).

The cheap cause that gets skipped. The part next to the valve: the plug (Route 4), the software (Route 1) and the relearn the paper prints (our advice: ask for it). FCA's case record on P0403 says valves replaced for that code came back as no trouble found on lower-mileage vehicles.

Fix it yourself. In practice: on a few older engines the valve is a bolt-on part; on a plug-in hybrid, a turbo diesel or a car with a valve buried under the intake it is dealer work. Hyundai's procedure for its Sonata Hybrid starts with disconnecting the high-voltage circuit and waiting at least three minutes for the capacitor to discharge. If you do change one, follow the paper's relearn.

At the shop — say this: "Please show me the test that says the valve failed, tell me whether a recall, campaign or warranty extension covers this VIN, and confirm that the closed position will be relearned after the new valve is in."

The coverage file: which recalls and papers run in September 2026

Status "as of September 2026" is our computation from the printed terms, and "cannot be computed" means the paper prints a term but no start point, or no term at all (Honda, Nissan). A recall or a program is not a repair of your car until a dealer has done it and written it down; ask by VIN.

What 1,390 complaints about EGR faults show

We searched NHTSA's complaint file for every narrative that names an EGR code, uses the words EGR or exhaust gas recirculation, or cites the number of an EGR recall, in the spellings owners use (including "ERG", "AGR" and a hyphen in "re-circulation"). 1,390 complaints; 1,296 describe a fault, a warning or a repair on the owner's car, and 94 are not about an EGR fault on the owner's car (most mention EGR only in a list of other parts or on another vehicle; 15 only looked like an EGR code). The first search found 1,100; a second search for what the first missed found 290 more, mostly owners who wrote only a recall number.

Here is what the owners say was found or done. "Came back" means the owner says the same light, code or symptom returned or the repair did not hold.

Three things stand out. First, most owners have no diagnosis: 441 of 1,296 name no cause and no repair, and 318 of them mention a recall, mostly an open one with the part not yet in. Second, the valve is named far more often than carbon or a wire: 359 against 36 and 13, and the valve is the repair most often followed by a return: 130 of 359, and 112 of the 223 that are not Chevrolet Volts, although software-only fixes show 22 of 33. Third, most complaints are not about the valve code. Three groups take 706 of the 1,296 complaints: 178 Chevrolet Volts, 283 Ram, Jeep and Dodge complaints that mention the EGR cooler or cite its recalls, and 245 BMW complaints (234 of them cite a recall, a campaign or the cooler). NHTSA's form records a fire in 73 of the 1,296, a crash in 12, an injury in 11 and a tow in 79; 30 of the 73 fire flags are in the 267 "EGR cooler or a leak" complaints.

The 8 complaints that print P0404

Only 8 of the 1,296 relevant complaints write the code, and 14 write P0404 or one of P0405 to P0409. A 2006 F-250 owner's dealer "COULDN'T FIND THE PROBLEM EVEN AFTER FULL INSPECTION" (ODI 11065690).

A 2023 Mitsubishi Outlander owner wrote "Warning reduced power engine sign came on out of no where." and that a reader showed "code p0404 EGR valve stuck.. mileage at only 10,000" (ODI 11605018). A 2018 Volt owner got "a P0404 message referencing the EGR valve" less than a week after a blown fuse (ODI 11631795). A 2019 Altima owner, above, got P0404 and a reduced-power message (ODI 11693179). A 2022 Sorento Hybrid owner was told of "an internal short in the EGR (Exhaust Gas Recirculation) Control Unit (Error codes P0404, P049D)" and of oil inside the unit (ODI 11710558). A 2012 Kia Optima owner's mechanic "retrieved fault codes P0303 and P0404, related to engine misfire in all cylinders" and said the engine needed replacing (ODI 11498592). A 2007 Ram 1500 owner's dealer "SAID NO" to a repair for P0406, with "CODES P0404 AND P0405 WAS RECORDED" (ODI 11142286). A 2006 Dodge Grand Caravan owner's dealer found that the van "was missing the Exhaust Gas Recirculation (EGR) valve", with P0403 and P0404; a tire business later installed one, and the van got worse (ODI 11701888). The last case is a reminder for a used-car buyer: ask whether the valve is there.

Two clusters this page does not repeat, and what is new since

The Chevrolet Volt. 178 of the 1,296 are Volts, 136 of them ending at a valve; 121 are 2017 cars, 29 are 2018 and 28 are 2016; 60 mention a fuse. Our P0401 guide tells that story with GM's bulletins. The 27 Volt valve figures here have a median of $2,700.

The diesel EGR cooler recalls. The recall filings and dealer instructions behind the 283 Ram, Jeep and Dodge complaints and the 245 on BMW are about a different part: FCA's say the cooler can crack from thermal fatigue and allow combustion in the intake manifold, and BMW's say it leaks coolant into the EGR system (19V-757, 20V-699, 18V-755). The P0401 guide has the fire numbers and the legal settlement.

Also in this count. Ford's recall for 2025 models (26V-122) was filed March 3, 2026, and ten complaints cite it. Nissan's Rogue accounts for 43 of the relevant complaints, 17 ending at a valve, 10 at a cooler and 6 at a sensor.

What owners say they paid

How much does it cost to fix P0404? PulsCar's reading of the documents and the file: nothing for a recall or a software update that FCA, Hyundai or Ford print as free (Nissan prints a warranty claim code, not a price to the owner); $8 to $15 for cleaner where a paper allows a cleaning; $100 to $400 for a diagnosis; and for a valve, $324 to $2,000 on cars other than the Chevrolet Volt (17 owner figures, median $700) and $243 to $4,000 on the Volt (27 figures, median $2,700). Our repair guide puts a gas-engine valve at $250 to $600. A sensor job was $690 and $800 in two reports. The code does not say where in that range your car is, so ask for the VIN check and the bulletin first, then for the test that says the valve failed.

Owner-reported figures are what people told NHTSA about EGR parts and labor: 88 figures from 78 complaints, after a mileage figure, a vehicle price, a rental or a repair of another system was set aside by one written rule; each is listed in the published file. 9 say the owner paid, 22 that the owner was billed, 45 that the owner was quoted and 12 do not say.

• EGR valve, cars other than the Volt: 17 figures from $324 to $2,000, median $700.
• EGR valve, Chevrolet Volt: 27 figures from $243 to $4,000, median $2,700, three of them under $1,100 (a $243 part price, a $717.80 parts invoice and a $1,000 bill); one owner was quoted $2,642 for the part alone after a part-number change.
• EGR sensor: $690 (a dual pressure sensor on a Ford Edge) and $800 (a DPFE sensor).
• Diagnosis: 5 figures from $100 to $400.
• EGR cooler: 24 figures from $300 to $5,000, median $1,974.
• Valve and other parts in one price: 12 figures, $210 to $4,000.

The figures are single reports, not a price list, and the Volt skews the valve figures upward. None of the 17 valve figures from cars other than the Volt is above $2,000.

Why P0404 comes back after a repair

In 130 of the 359 complaints in which a valve was named as the cause or replaced, the owner says the problem returned; 112 of those 130 are not Volts (112 of the 223 non-Volt valve complaints). The papers point to two reasons, and a third is upstream: Kia's P040400 may be related to a shorted air-conditioning harness and Toyota's EGR code (P140018) can be a loose connector pin.

The cause was not the valve. Jaguar Land Rover writes that valves were "returned to the supplier with no fault found." FCA says valves replaced for P0403 came back as no trouble found. Nissan and FCA fix P0404 with software and no part.

The repair has a relearn step. FCA's recall repair includes "perform the EGR Valve Replaced learn procedure." Most of Nissan's P0404 bulletins (not NTB25-008) end with relearns of the throttle valve closed position, idle air volume and accelerator closed position. No P0404 paper says a missed relearn brings the code back, though Mazda blames a wrongly learned closed position for its rough idle; ask for the step (our advice).

Can you drive with P0404?

Can you drive with P0404, and for how long? PulsCar's advice, not a maker's rule: a steady light with a car that drives normally can wait a few days for a diagnosis, unless your VIN shows an open recall for loss of drive power (then do not wait: for a Hyundai recall with the light on, do not drive further and ask for a tow; for a Ford or Lincoln recall, park it outside and ask the dealer whether it may be driven). If the car has stalled, lost power, shown reduced power or limp mode, will not start, or the light is flashing, pull over safely, switch the engine off and have it towed. The one exception is a shop within 2 to 3 miles, reached gently, under 40 mph and on a light throttle, and not for a car with an open EGR recall (FCA's Z31, Hyundai's recall 260, Ford's 26V-122): call the dealer from where you stopped and ask for a tow.

What the papers say. None of the bulletins we read about the code itself tells the owner to stop driving. Two of the EGR valve recall papers do, and BMW's EGR cooler recall letter (18V-755) says "Do not continue to drive the vehicle". Hyundai's dealer guidance for recall 260 (2024 Elantra, Venue, Kona) tells owners who see the check engine light or a sudden loss of power "do not attempt to drive the vehicle further until the remedy is applied". Ford's filing for 26V-122 prints "Do Not Drive Park Outside", while Ford's owner letters say Ford has not issued instructions to stop driving: take the stricter reading: park it outside and call the dealer today to ask whether the car may be driven or must be picked up or towed.

Should you buy a used car with P0404 in its history?

Ask four things. Was a recall, campaign or bulletin on the EGR valve done, and when? A dealer's printout beats a seller's word. Is the valve there? The Grand Caravan owner above had a van that a dealer found to be missing it. Is a software update pending for the ECM? Nissan's list is by ECM part number. Was the code cleared right before the sale? A cleared code with no drive cycle shows nothing. A car from a recall window with the repair undone is a free repair waiting, not a reason to walk away, but with any open loss-of-power recall, have the repair done before you drive the car home, or ask for it at the seller's cost.

Clearing P0404 before an inspection

An emissions inspection generally checks that the check-engine light is off and that the readiness monitors have completed; the exact rules differ by state, so ask your inspection station (our advice). Clearing the code resets the monitors, and the EGR monitor is one of them; a car that was cleared yesterday will show "not ready". Do not clear and go. Fix the cause, drive the car through several normal trips and let the monitors finish before the test (our advice).

What the papers tell a shop to do with P0404, checkpoint by checkpoint

1. Confirm the code and the condition. Nissan: the code stored below 32°F, or the warning shown, and the ECM part number against the list. Honda: the MIL with P0404.
2. Check the VIN for recalls, campaigns and notices. Hyundai, Ford and FCA print repairs that need no diagnosis step at all.
3. Read the other codes first. FCA: P0407 and P0408 first; Jaguar Land Rover: a diagnostic-tool routine and leak check.
4. Inspect the harness and the plug. Kia's idler pulley, Toyota's loose pin, FCA's pushed-out pins.
5. Look at the valve. Mazda and Mercedes: carbon at the seat or the blades; replace only if the seat is damaged, the blades are seized or the complaint returns after a cleaning (Mercedes).
6. Replace the valve only on a stated cause or an open campaign, then relearn as the paper prints and clear.

Three P0404 traps

Trap 1 · Searching for a recall and stopping when there is none. Nissan's P0404 papers are bulletins, and a 2019 Altima owner wrote "MY VIN DOES NOT SHOW THIS RECALL." Ask for the bulletin by number.

Trap 2 · Searching for P0404 with the zero. Hyundai's recall text prints "P404".

Trap 3 · Buying the valve on the code alone. The code says the valve is not where it was told to be; it does not say why. In 130 of the 359 complaints that name or replace a valve, the owner says the problem came back.

The P0404 plan: 10 minutes, today, this week

Today (10 minutes). Write down the whole code list, what the car did and the temperature; look at the valve's plug with the key off. Today (VIN). Enter your VIN at nhtsa.gov/recalls, then ask a dealer whether there is a bulletin or software update for P0404 on your VIN; if your car is in the maker atlas above, give them that paper's number. This week. If the light stays on, pay for one diagnosis, ask for the measurements in writing and let the shop try the cheapest route first. If it has stalled, lost power, shown reduced power or limp mode, failed to start, or the light is flashing, do not keep driving: pull over safely, switch the engine off and have it towed (the one exception is a shop within 2 to 3 miles, reached gently, under 40 mph and on a light throttle, and not for a car with an open EGR recall: FCA Z31, Hyundai recall 260 or Ford 26V-122).

These are composite scenarios, not individual customers. If you drive a 2021 Rogue with the 2.5L engine and a P0404 with nothing to feel, ask for Nissan's NTB21-092 by number and have the dealer check your ECM part number before you accept a valve quote. If you drive a 2024 Elantra, Venue or Kona that loses power or shows the check engine light, do not keep driving it: ask a Hyundai dealer for recall 24V-308 by number and for a tow; an owner of a 2021 Venue, outside the recall window, wrote that the dealer said it could not get the repair covered under warranty without a code present (ODI 11616030). If you drive a 2012-2013 Ram 1500 with the 4.7L engine and a P0404 with an engine surge, ask for 09-010-16 by number; the free extension has ended, so ask the dealer for goodwill and bring the paper.

Sources and documents

Primary documents only. Where a claim in this guide is marked 🟢, it rests on one of the items below, and the reference is given so you can pull the document yourself. Claims marked ⚪ are shop-price estimates or symptom descriptions carried from PulsCar's repair guides — estimates, not measurements from a dataset we own.

1. Nissan: bulletins NTB21-092 and NTB21-092A; NTB22-067 and NTB22-067A; NTB22-097; NTB25-008.
2. Stellantis (FCA, Ram, Jeep, Dodge): Customer Satisfaction Notification T23; 09-010-16 and warranty extension D-16-15; 18-001-22; tech tip GPOP 04627465A; STAR cases S2025000005 and S2118000015; tech tip GPOP 68490212A; safety recall 22V-284 (Z31) and BorgWarner's equipment recall 22E-051; cooler recalls 19V-757 and 20V-699, read from NHTSA's recall filings.
3. Honda: 13-095 version 3 and 13-095.
4. Hyundai and Kia: 24-01-080H, 25-01-023H and the dealer best-practice document 9B3; safety recall 24V-308 (Hyundai recall 260), including Hyundai's dealer guidance for it; Kia SC320 and PS554.
5. Ford: safety recall 26V-122 (Ford 26S10); Customer Satisfaction Program 25M03; TSB 23-2059.
6. Jaguar Land Rover: SSM73201 and SSM73311.
7. Mazda, Mercedes-Benz, BMW, Toyota, GM: Mazda 01-001/21; Mercedes Sprinter LI14.20-N-073867 and the extended-warranty notice for the EGR valve; BMW SI B01 14 18, and recall 18V-755; Toyota T-SB-0023-26; GM 25-NA-059.
8. PulsCar analysis of NHTSA public data, October 2026: 1,390 complaints about EGR faults, each sorted twice by the same written rules; owner-reported amounts; the document list with check status and links. Complaints, amounts, documents, the sorting rules and how we did it (CC BY 4.0).

For the neighboring pages: the P0401 guide for the flow code, the Chevrolet Volt and the diesel EGR coolers, P0171 for the lean code, a car running rough, a car that stalls while driving, throttle body replacement cost, what a check engine light means and the check-engine code index.

For P0404, the codes, the VIN and the documents above are the evidence.

Methodology. The complaint set is every complaint in NHTSA's file received from January 2015 to early October 2026 that names an EGR code (P0400 to P0409 or a maker code) in any spelling we searched, or uses the words EGR or exhaust gas recirculation, or cites the number of an EGR recall: 1,390 in all, 1,100 from the first search and 290 more from a second, independent search. Every complaint was sorted twice, independently, by the same written rules, fixed before each batch was sorted; the two sortings matched on the category in 88% of them (1,227 of 1,390), every disagreement was settled by a written rule, and a final consistency check under the same rules changed 60 complaints on which both sortings had agreed. 1,296 describe an EGR fault, warning or repair on the owner's car and 94 do not; motorcycles, motorhome chassis, buses and heavy trucks are outside this study. Counts are complaints, not cars, and nothing here is a failure rate. The document set is every NHTSA index entry for a passenger vehicle or light truck that names an EGR code or discusses the EGR valve, its sensor, its pipe or its cooler (998 entries before we set aside heavy trucks, buses, papers that mention EGR only in passing and papers about the flow code alone), plus 36 found by a second search; 272 files with text (3 heavy-truck papers set aside), 241 distinct documents, 164 read in full with 105 revisions and copies compared line by line, 8 recall filings read in full, 21 entries with no file. Recall years, vehicle counts and dates come from the recall filings, not from NHTSA's index, which widens years.

Prices verified July to October 2026 in the repair guides they are carried from and in the owner reports above, and reviewed quarterly. Technical documents verified October 2026: the 241 distinct documents in our published file, of which 164 were read in full, among them FCA's Z31 recall and Ford's 26V-122 filing, read in full as well.

Had P0404 cleared by a reset, a software update, a recall or a wire, or a valve replaced for nothing? Email [email protected] with the vehicle, mileage and outcome.