2013 Jeep Grand Cherokee: misfire or rough idle

Filed Aug 18, 2026 · Engine, Transmission · GA

My 2013 Jeep Grand Cherokee equipped with the 3.6L Pentastar v6 has a persistent cylinder 2 misfire (P0302). The cylinder 2 spark plug, ignition coil, and fuel injector have already been replaced, but the misfire continues. Diagnostic testing with a scan tool confirmed that cylinder 2 accumulated 61 misfires during a single test while cylinders 1,3, 4, 5, and 6 recorded zero, and the misfire monitor reported " Fail this trip" the vehicle can appear to drive normally despite the active misfire. I became aware that Chrysler issued warranty bulletin x56 concerning the 3.6L left cylinder head on certain 2011- 2013 vehicles including select 2013 Jeep grand Cherokees. I contact a jeep dealer and advise that my VIN is not included in that warranty extension. I am reporting this because my vehicle is experiencing a similar cylinder specific misfire concerns and I believe this condition should be documented and investigated.

Filed Apr 17, 2025 · Fuel system · MN

The V62 fuel pump recall was repaired in 2021. Recently this vehicle has had hard starts again, misfires, engine light came on. The vehicle was taken in to certified repair shop. The shop states cannot diagnose without tearing the only thing apart and a high expense. The shop believes it could be lifters or possibly cam but they are unsure even though the systems to this vehicle having a hard start and misfiring relates to this V62 fuel pump relay that is relates to the cam shaft sensor and causes hard starts and misfires. The car is not driveable more than a short distance. The vehicle is unsafe to drive due to the fact you do not know when this vehicle will stall or start again. The V62 recall pet fuel pump relay has malfunctioned. This part was repair but is a faulty part, a lemon, and the manufacturer should be standing behind this part and their product. I have discussed this with the repair shop and Chrysler/Jeep and now pursing with you due to the safety of this vehicle, the defective recall part, and the fact the manufacturer needs to stand behind their product.

Filed Dec 18, 2023 · Engine · 89,000 miles · MA

The contact owns a 2013 Jeep Grand Cherokee. The contact stated while driving 10 MPH, the vehicle started shuddering. The check engine warning light illuminated. The contact was able to drive to the nearby residence. The contact stated that her husband used an OBD reader to diagnose the vehicle and determined that cylinder #5 was misfiring. The contact stated that her husband replaced the fuel pump relay. The contact stated that after replacing the fuel pump relay, the OBD reader indicated that cylinder #7 was misfiring. The dealer was notified of the failure and informed the contact that the VIN was not included in a recall. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 89,000.

Filed Sep 3, 2021 · Transmission · 128,000 miles · MO

The contact owns a 2013 Jeep Grand Cherokee. The contact stated that while driving at various speeds or while stopped at a stop sign, the vehicle was rough idling and would stall intermittently. The vehicle was taken to an independent mechanic and diagnosed as compression leaks and cylinder head failure. The mechanic referred the contact to the dealer. The vehicle was taken to the dealer and the dealer informed the contact that the failure was related to a manufacturer's X56 extension warranty for the 3.6 Liter left cylinder head. The VIN was not included in the extended warranty and the contact was referred to the manufacturer. The vehicle was not repaired. The manufacturer was made aware of the failure and referred the contact to file a complaint with the federal safety agency. The failure mileage was approximately 128,000.

Filed Sep 29, 2020 · Engine, Transmission · 125,000 miles · FL

Tl* the contact owns a 2013 jeep grand cherokee. The contact stated while driving at various speeds, an abnormal ticking sound was heard coming from engine without warning. The contact took the vehicle to an independent mechanic where the vehicle was diagnosed with a defective rocker arm. The manufacturer was contacted and the contact was informed that there was no recall on the vehicle. The contact was also informed to take the vehicle to an authorized dealer to be serviced. The contact spoke with firkins chrysler jeep dodge ram (2700 1st st, bradenton, fl 34208) and was provided a cost to diagnose and determine the cause of the failure. The contact declined the service. The contact stated that the check engine warning light recently appeared on the instrument panel after the vehicle misfired while driving at a low rate of speed. The vehicle was not repaired. The failure mileage was approximately 125,000.

Filed Feb 3, 2020 · Engine · FL

Auto mechanic says that the 5th cyllinder in this jeep grand cherokee hemi engine is prone to fail. Probably manufacturer defect. The fifth cylinder misfire caused cylinder to deteriorate and leak metal into engine causing failure. The car stalled while driving on a busy road in jacksonville florida..