2015 Jeep Wrangler: misfire or rough idle

Filed Sep 13, 2026 · Airbags, Engine · AZ

I purchased this 2015 Jeep Wrangler Rubicon new and have maintained and serviced it regularly. At approximately 75,000–80,000 miles, the engine began developing a ticking noise from the passenger/right cylinder head area. The problem progressively worsened. At approximately 100,000 miles, repairs were performed involving the right-side cylinder head and camshaft because of camshaft/valvetrain wear and a persistent cylinder #2 misfire. The right-side cylinder head/camshaft area has required repair more than once. Rocker arms were also replaced, but the underlying problem continued. The vehicle now has approximately 150,000 miles. The engine recently shut down and developed a loud mechanical noise. Upon inspection, significant wear/damage was again found involving the right-side exhaust camshaft/valvetrain, and there are concerns involving the timing chain/tensioning system. A failure of these components while driving could cause sudden engine shutdown or loss of power, creating a safety risk. The vehicle has also developed electrical/safety-related problems. The airbag warning light is illuminated, and the steering-wheel controls and steering-wheel illumination are not functioning. The vehicle was involved in an accident in 2019; however, the engine ticking condition was already present before that accident, although it was less noticeable at that time. Despite previous repairs, the engine/valvetrain problem has returned. I am reporting this because the repeated camshaft/valvetrain failure, persistent cylinder #2 issue, possible timing-system problem, and associated risk of engine shutdown appear abnormal and potentially safety-related for a regularly maintained vehicle.

Filed Jun 29, 2026 · Engine, Transmission · VA

am the original owner of this 2015 Jeep Wrangler, which I purchased new. The vehicle has been properly maintained according to the manufacturer's recommended maintenance schedule. I have records documenting routine maintenance, including regular oil changes. At approximately 75,000 miles, I began hearing a persistent ticking noise from the engine. Because I was concerned that the noise could indicate a mechanical problem, I scheduled an inspection with an authorized Jeep dealership. The dealership diagnosed the vehicle with a failed rocker arm that caused damage to the exhaust camshaft. The dealership advised that the intake camshaft remained in good condition, indicating that the failure was isolated to the exhaust valvetrain at the time of diagnosis. This type of internal engine failure at approximately 80,000 miles was unexpected for a properly maintained vehicle. My concern is that if this condition is not diagnosed promptly, continued operation could result in further engine damage, loss of engine performance, engine misfire, or potential engine failure while the vehicle is being driven, creating a potential safety hazard. While researching this issue after receiving the diagnosis, I found numerous reports from other owners of vehicles equipped with the 3.6L Pentastar engine describing similar rocker arm and camshaft failures across Jeep owner forums, Reddit, Facebook owner groups, and YouTube. Although I understand there has not been a recall for this condition on my vehicle, I believe the number of similar owner reports suggests the issue may warrant further review. I am submitting this complaint so that the federal safety agency is aware of the issue and can evaluate whether similar failures are occurring with sufficient frequency to justify additional investigation.

Filed Nov 4, 2025 · Engine · LA

2015 Jeep Wrangler with 3.6l Pentastar Engine having repeated engine failures associated with the use of possibly defective repair parts / defective cylinder head repairs / recurring cylinder 6 misfire alerts..

Filed Mar 28, 2025 · Engine · 86,096 miles · MA

The contact owns a 2015 Jeep Wrangler. The contact stated that while driving 30 MPH, there was an abnormal sound coming from the engine. The check engine warning light was illuminated. The vehicle was taken to a dealer, who determined that there was a misfire in cylinders #1 and #2, and the right intake valve needed to be replaced. The vehicle was not repaired. The vehicle remained at the dealer and had not been driven since. The manufacturer was made aware of the failure. The failure mileage was approximately 86,096.

Filed Feb 7, 2025 · Engine · NC

Same problem that I'm having is happening to thousands of people. People are either swapping engines ($20k+) or fixing for ($5k+)Sand debris left in 3.6 engine at time of manufacturing that causes cooling system repair and eventually engine head replacement because of misfire warning. My jeep has 60k miles. Have already replace radiator 2 years ago and now I'm getting misfire on cylinder 2. Ran compression test on cylinder 2 . Only 80 psi showing on gauge compared to 150 psi in the other cylinders. Head is bad. There has been a extended warranty on older jeeps with same engine to fix the issue but, not for 2014 and up. Which makes no sense. PLEASE HELP

Filed Dec 10, 2024 · Engine · VA

while driving at an 50 MPH speed, the check engine warning light illuminated and flashing continuously. The vehicle was not in drivable condition since it was unusually vibrating while either standing or driving at very low speed. The vehicle was taken to an independent mechanic, who determined that there was a cylinder #2 misfire, and that the valve, cylinder head or crack on the casting causing this issue. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 75,000.

Filed Nov 24, 2024 · Engine · LA

Cylinder 4 misfire

Filed Nov 21, 2024 · Engine · 88,000 miles · FL

The contact owns a 2015 Jeep Wrangler. The contact stated that while driving at an undisclosed speed, the check engine warning light illuminated. The vehicle was taken to an independent mechanic, who determined that there was a cylinder #2 misfire, and that the valve needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 88,000.

Filed Sep 30, 2024 · Engine · TX

2015 original owner, developed misfire cylinder #4 P0304, replaced coils, plugs, injectors, harness on that side. Misfire still present, noted others have reported issues with cylinder head (valves, cams, rockers). Engine has a slight tick, found no recalls on the federal safety agency site except for 2014 versions with same engine for this exact issue.

Filed Sep 10, 2024 · Engine · ID

The engine has a known failure causing a cylinder misfire that is resolved by replacing the cylinder heads. This is a known issue to FCA and caused an extension of the powertrain warranty for the 2010-2014 models but does not cover later engines, that are still experiencing the same issues. The covered years needs to be extended to 2018 or beyond and all out-of-pocket repair costs should be refunded to the consumer.

Filed May 2, 2024 · Engine · TN

Check engine light came on for misfire in Cylinder 4. Jeep lost power when on the road

Filed Apr 7, 2024 · Engine · AL

Cranked my vehicle from a cold start and it started running very rough. Had a mechanic put a code scanner on it and it read cylinder #2 misfire. I have been told this is very problematic with the 3.6 pentastar engine and a costly repair. If this is a factory defect I would like to be informed about any and all considerations to which I am entitled to. Thank you very much.