Fault Code Lookup › Powertrain codes › P0304

P0304 Powertrain · generic OBD-II

Cylinder 4 Misfire Detected

P0304 is a standard code covering engine, transmission, fuel and emissions. It names the system that logged the fault, not the part that failed. Below: which cars owners reported it on, what happened, and recalls on those cars, from 182 complaints filed with NHTSA. Updated November 3, 2026.

Owners also write it as P030485, P030400 (the last two characters are the sub-code).

  • 182owner reports
  • 36car models
  • 0mention a crash
  • 1mention a fire
  • 2012–2025model years

Which cars get code P0304?

Every model whose owners mentioned P0304 in a complaint, most reports first. Each year opens that car's full problem report. Popular models collect more reports because more of them are on the road.

Where does P0304 show up?

By brand

  • Ford129
  • Jeep14
  • Chevrolet11
  • Chrysler8
  • Dodge7
  • GMC4
  • Volkswagen3
  • Mercedes-Benz3
  • Land Rover2
  • Ram1

Component the owner filed it under

  1. Engine162 (89%)
  2. Power Train34 (18.7%)
  3. Fuel/Propulsion System17 (9.3%)
  4. Engine And Engine Cooling12 (6.6%)
  5. Electrical System10 (5.5%)
  6. Vehicle Speed Control4 (2.2%)

Is there a recall for P0304?

The others concern the component owners file this code under (Engine) on the same cars; they may or may not relate to the code. Recall repairs are free; check your VIN at nhtsa.gov/recalls.

Engine And Engine Cooling: Engine: Hard Parts Internal/Mechanical Ford Motor Company (Ford) is recalling certain 2025-2026 Explorer, Ranger, and Bronco vehicles. The engine may fail, which can result in a loss of drive power. NHTSA campaign 26V343000 · May 27, 2026 · Affected cars

2025 Ford Explorer. Full risk and remedy on each car's report.

Engine And Engine Cooling: Exhaust System: Emission Control: Gas Recirculation Valve (Egr Valve) Ford Motor Company (Ford) is recalling certain 2025 Ranger, Lincoln Nautilus, Mustang, Maverick, Explorer, Escape, Lincoln Corsair, Bronco Sport, and Bronco vehicles. The exhaust gas recirculation (EGR) valve may fail, resulting in an unexpected loss of drive power. NHTSA campaign 26V122000 · March 3, 2026 · Affected cars

2025 Ford Explorer. Full risk and remedy on each car's report.

Engine And Engine Cooling: Engine: Hard Parts Internal/Mechanical Ford Motor Company (Ford) is recalling certain 2025 Transit, F-150, and Explorer vehicles. The connecting rod and rod bearing components may have manufacturing defects that can lead to engine damage and engine failure. NHTSA campaign 25V344000 · June 13, 2025 · Affected cars

2025 Ford Explorer. Full risk and remedy on each car's report.

Engine And Engine Cooling: Engine: Hard Parts Internal/Mechanical General Motors LLC (GM) is recalling certain 2021-2024 Cadillac Escalade and Escalade ESV, Chevrolet Silverado 1500, Suburban, and Tahoe, GMC Sierra 1500, Yukon, and Yukon XL vehicles equipped with a 6.2L V8 gas engine. The connecting rod and/or crankshaft engine components may have manufacturing… NHTSA campaign 25V274000 · April 24, 2025 · Affected cars

2023 Chevrolet Silverado, 2021 Chevrolet Silverado, 2022 Chevrolet Silverado, 2021 GMC Yukon XL. Full risk and remedy on each car's report.

Engine And Engine Cooling: Engine: Hard Parts Internal/Mechanical Ford Motor Company (Ford) is recalling certain 2021-2022 Bronco, F-150, Edge, Explorer, Lincoln Nautilus, and Lincoln Aviator vehicles equipped with either a 2.7L or 3.0L Nano EcoBoost engine. The engine intake valves may break while driving, which can result in engine failure and a loss of drive… NHTSA campaign 24V635000 · August 23, 2024 · Affected cars

2021 Ford Explorer. Full risk and remedy on each car's report.

Engine Ford Motor Company (Ford) is recalling certain 2020-2022 Explorer vehicles equipped with the Police Interceptor Utility Package. In the event of an engine failure, engine oil and fuel vapor may be released into the engine compartment and accumulate near ignition sources such as hot engine or exhaust… NHTSA campaign 24V598000 · August 10, 2024 · Affected cars

2021 Ford Explorer. Full risk and remedy on each car's report.

Engine And Engine Cooling: Engine: Oil/Lubrication: Pump Ford Motor Company (Ford) is recalling certain 2016-2018 Ford Focus and 2018-2022 Ford EcoSport vehicles. The oil pump drive belt or drive belt tensioner may fail, resulting in a loss of engine oil pressure. NHTSA campaign 23V905000 · December 22, 2023 · Affected cars

2018 Ford Focus. Full risk and remedy on each car's report.

Engine And Engine Cooling: Engine: Gasoline: Turbo/Supercharger Ford Motor Company (Ford) is recalling certain 2023 Explorer vehicles equipped with 2.3L GTDI engines. The turbocharger oil supply line may be damaged, which can result in an oil leak inside the engine compartment. NHTSA campaign 23V597000 · August 25, 2023 · Affected cars

2023 Ford Explorer. Full risk and remedy on each car's report.

What happened when owners saw P0304?

10 of the 182 reports, spread across the models above, as the owners wrote them. NHTSA removes names and VINs; long reports are trimmed. CarHooq has not verified individual claims.

Apparently my 2018 Ford Escape 1.5 liter Ecoboost engine has a known flaw of coolant intrusion into the cylinders. It can be inspected right now as it's at the Ford service center. This problem could have left me on the side of the freeway at night. Ford service has verified the problem and that it needs a new engine. I dont believe the parts have been inspected by anyone other than Ford service and my independent mechanic. There was a check engine light that came on back in April of this year. I brought it into Ford for basic minor service on April 29 and was told to check diagnostics I had to pay $298. I took it elsewhere and they told me it was a code that came up for the smog system. I…
2018 Ford EscapeEngineNHTSA complaint 11772509 · Oct 20, 2026
My 2016 Ford Edge equipped with the 2.0L EcoBoost engine developed a check engine light and began producing white smoke from the exhaust after sitting overnight. The vehicle was taken to an authorized Ford dealership for diagnosis. The Ford technician performed a self-test and found diagnostic trouble codes P0304 and P0316 stored in the PCM. The dealer pressure-tested the cooling system, removed the cylinder 4 spark plug for inspection, and confirmed coolant intrusion into cylinder 4. The dealer then searched Ford's OASIS system and identified Ford TSB 22-2229, which calls for replacement of the engine long block for this condition. The dealership has recommended long-block engine…
2016 Ford EdgeEngineNHTSA complaint 11769502 · Oct 7, 2026
My 2019 Ford Fusion 2.0L EcoBoost (89,000 miles) experienced a sudden, severe engine malfunction due to a known manufacturing defect. The vehicle exhibited severe engine shuddering and a harsh cold-start misfire upon ignition. A diagnostic scan revealed trouble codes P0316 (Misfire on Startup), P0302 (Cylinder 2 Misfire), and P0304 (Cylinder 4 Misfire). A mechanic verified that these codes are the result of internal coolant intrusion into the engine cylinders, exactly as documented in Ford Technical Service Bulletin TSB 19-2346. The structural design flaw in the engine block allows engine coolant to breach the cylinder head gasket area and pool inside the combustion chambers. This presents a…
2019 Ford FusionEngineNHTSA complaint 11747790 · Jul 1, 2026
Year: 2022 Make: Chevrolet Model: Silverado 1500 Engine: 2.7L TurboMax (L3B) VIN: [XXX] Mileage at Failure: 119,139 Description of Problem: 2022 Chevrolet Silverado 1500 2.7L L3B TurboMax engine is completely inoperable due to Cylinder 4 exhaust roller follower failure causing exhaust camshaft failure and bent exhaust valves. Vehicle shakes severely, will not accelerate, check engine light on, and has gone into limp mode. Diagnostic codes P0304 (Cylinder 4 misfire) and P2101 (electronic throttle actuator fault triggered by engine shaking and limp mode) were recorded. All external components including spark plugs, coils, and injector harnesses were inspected and ruled out as causes. Failure…
2022 Chevrolet SilveradoEngine, Fuel/Propulsion SystemNHTSA complaint 11726630 · Mar 24, 2026
My Jeep began misfiring, giving a P0304 error code via the ODB. On June 2nd 2025, we took it to the Sandy Sansing CDJR Dealership. They determined that my 3.6L Pentastar V6 engine needed a new camshaft and lifters, despite having only 42,609 miles on it. To further complicate things, it took the dealership over a month to get a replacement camshaft in and installed, due to an abnormally high demand for replacement camshafts; this suggests a systemic problem with the engine, especially considering the problematic history of earlier versions of the 3.6L Pentastar V6 (1). https://static.nhtsa.gov/odi/tsbs/2014/MC-10069161-0335.pdf
2018 Jeep WranglerEngineNHTSA complaint 11695313 · Oct 23, 2025
My Engin light went on code was P0304 cylinder 4 misfire.I recently replaced #4 ignition coil. Using power balance test, confirmed cylinder #4 is misfiring but only on idle. Per TSB 19-2310 , suspect #4 direct fuel injector of leaking. The dealership will not help back up this problem. Need all 6 fuel injectors replaced to make my truck SAFE to drive.my truck has the 2.7L v 6 eco boost engine. A lot of these engines have this problem, Ford as of now does not have a recall but should. This problem needs fixed before someone gets hurt. This could cause a fire.
2016 Ford F-150Engine, Fuel/Propulsion SystemNHTSA complaint 11614121 · Sep 12, 2024
On 7/16/26 vehicle would not start; high-pitched noise heard near engine during no-start diagnosis. Towed to Goldy Chrysler Dodge Jeep Ram, Huntington WV. Per dealer invoice #27136: blown 500-amp main battery fuse found; after jumping past fuse, white smoke from exhaust and no coolant in system, diagnosed as blown head gasket. Repair: both-side head gasket replacement plus fuse assembly. Vehicle in shop 7 weeks, returned 9/4/26 with new unresolved issue: strong smell of burned electronics and antifreeze in cabin. All failed components available for inspection upon request. Safety risk: head gasket failure/coolant intrusion caused engine hydrolock, a sudden uncommanded loss of engine power…
2019 Chrysler PacificaPower Train, Electrical System, EngineNHTSA complaint 11762335 · Sep 5, 2026
RECEIVE OBD ERROR CYLINDER 4 MISFIRE (P0304). MECHANICS HAVE REPLACED ALL PLUGS & IGNITION COIL ON CYLINDER 4. CEL WITH SAME ERROR CAME BACK. ROUGH IDLE AT STATIONARY POSITION. CAR AS 127K MILES ON IT. CHRYSLER EXTENDED ENGINE WARRANTIES ON 2011-2013 T&CS FOR THIS EXACT ISSUE FOR EVEN # CYLINDER HEAD MISFIRES. WOULD LIKE TO SEE IF WARRANTY COULD BE EXTENDED FOR 2014 TO FIX THIS ISSUE.
2014 Chrysler Town and CountryEngineNHTSA complaint 11307759 · Feb 7, 2020
ENGINE BUCKS AND SKIPS. CODE P0302, P0304, P0306,P0863, P0152, P0175, B193. LAST EVENT OCCURRED IN DRIVEWAY AND RAN FINE AFTER DRIVING ABOUT A HALF MILE. OTHER EVENTS SIMILAR.
2013 Dodge Grand CaravanEngineNHTSA complaint 11415608 · May 7, 2021
The 2.3L EcoBoost engine failed due to coolant leaking into the combustion chambers. The dealer found coolant present in cylinders 1 and 4, the cylinder 4 piston washed, and vertical scoring on the cylinder 4 wall. The dealer's recommendation is complete engine replacement. Yes, the engine is available for inspection. The vehicle is currently at the Ford dealership and the engine has not yet been replaced. Coolant entering the cylinders causes misfiring and loss of engine power. The vehicle shook on startup and ran roughly, and the misfire was intermittent and unpredictable. A sudden loss of motive power while driving in traffic or at highway speed is a crash risk to me and to other drivers…
2018 Ford MustangPower Train, EngineNHTSA complaint 11770803 · Oct 13, 2026

P0304: questions drivers ask

What does code P0304 mean?

P0304 is a generic OBD-II powertrain code. Its standard definition is "Cylinder 4 Misfire Detected". The code tells you which system set the fault, not which part failed; the owner reports on this page show what it meant in practice for 36 car models.

Which cars get code P0304 most often?

In NHTSA owner complaints, P0304 is mentioned most for the Ford Escape (57), Ford Edge (36), Ford Fusion (19), across 36 models and model years 2012 to 2025. Popular models collect more reports because more of them are on the road.

Is there a recall for code P0304?

No NHTSA recall text names P0304 directly. 8 recalls on the cars that report this code concern the same component owners name most (Engine); they may or may not relate to the code. Check your VIN at nhtsa.gov/recalls.

What should I do if my car shows P0304?

Write down when the code appeared and what the car did (warning lights, loss of power, noises, speed, weather). Check your VIN for open recalls at nhtsa.gov/recalls, ask a dealer or independent workshop to read the stored freeze-frame data before anyone clears the code, and keep the repair order. If the car loses power in traffic, stop driving it. CarHooq does not diagnose: these are owner reports and official recall notices, not repair advice.

How this page was made

CarHooq read the text of every owner complaint filed with NHTSA for 19 US and European brands (model years 2012 onwards) and picked out the diagnostic trouble codes owners wrote down. This page lists every mention of P0304 (including sub-code forms such as P030485). The definition is the generic SAE J2012 wording; a carmaker may use the code slightly differently. Nothing here is a diagnosis. Data: NHTSA Office of Defects Investigation (public domain), retrieved November 3, 2026. How CarHooq reports are made.

Look up another code

Or check a car: Problem Lookup · Used-car checker