2021 Jeep Wrangler Engine Problems

The engine is overheating at idle speed and there's a phamtom coolant leak. We just bought this in January and are already having major issues. Seems to be a problem with the plastic coolant reservoir being near a very hot engine.

Vehicle started and put in reverse. after backing up approximately 15 ft, vehicle put into driver and once accelerator was pressed, vehicle stalled. Tried to restart, engines turned over but stalled again after 1 second. Waited 10 seconds and tried to restart again, stalled again 1 second after turnover. Turned vehicle completely off, opened door, waited 30 seconds, tried starting again and system attempted to stat for 5-10 seconds (push to start ignition so I had no control over how long it tried this), but engine would not turn over. Vehicle also could not be shifted out of park (turned vehicle off and tried to put in “On” position without ever depressing the brake). Vehicle now stuck in driveway and unable to be moved. Acting like an issue with the fuel pump, which is a recall that was announced for some vehicles of this make and model, but NHTSA check shows no open recalls on vehicle. No warning lights or check engine lights came on.

I own a 2021 Jeep Wrangler Rubicon 392 with the 6.4L engine (VIN: [XXX] ). The vehicle has a dangerous condition where the engine stalls unexpectedly when the fuel level is approximately 1/4 tank or lower and the vehicle is traveling downhill. When the vehicle is positioned on a decline or downhill slope, the engine suddenly shuts off without warning. This appears to be fuel starvation on decline when the fuel level is below approximately 1/4 tank, resulting in engine stall and loss of power steering and braking assist after stall. This has occurred multiple times and creates a significant risk of crash due to the sudden loss of engine power and reduced steering and braking assistance while the vehicle is in motion. The issue is particularly concerning when descending hills or driving on angled terrain. The vehicle was taken to an authorized dealership (Carvana Jeep San Diego) where technicians determined the likely cause is a defective fuel pump module associated with the Wrangler Rubicon 392 6.4L fuel pump module. However, the dealership informed me the replacement fuel pump module is currently on national backorder from the manufacturer (Stellantis/Jeep). They stated there is no confirmed availability date and that many vehicles may be waiting for the same component. My vehicle has been awaiting repair for approximately four months due to the unavailable fuel pump module. Because the vehicle can stall unexpectedly while traveling downhill, this defect presents an ongoing safety hazard and potential risk of crash. This complaint is being submitted so the issue can be evaluated as a potential safety defect involving fuel delivery failure, fuel pump module malfunction, and engine stall under low fuel conditions in the Jeep Wrangler Rubicon 392. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The contact owns a 2021 Jeep Wrangler. The contact stated that while driving at an undisclosed speed on the highway for 45 minutes, there was an abnormal odor of chimney fire, which continued while at the stop sign. The front passenger occupant noticed there was smoke from underneath the hood. While pulling over, the steering wheel locked up, and the occupants exited the vehicle. The engine warning light was illuminated. The damper had previously been replaced, but the vehicle was well-maintained. There were no reported injuries, air bag deployment, or crash. The fire department was able to extinguish the fire. The police were called to the scene, but there was no police report. The vehicle was towed to a tow lot. The local dealer was contacted. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 52,000. The VIN was not available.

Jeep has a design defect in vehicles equipped with the 2.0L turbocharged engine where the coolant reservoir is positioned directly adjacent to the turbocharger and turbo heat source with insufficient heat shielding. Due to the constant high heat exposure, the plastic coolant reservoir and/or connecting plastic fittings degrade, warp, and become brittle over time, eventually leading to coolant leaks, erratic coolant temperature readings, and/or sudden coolant loss. This failure often occurs without warning, and many vehicles do not initially trigger a check engine light. In my case, the vehicle exhibited intermittent coolant temperature readings, abnormal fan operation, and heating inconsistencies before the leak was discovered. Multiple repair attempts are frequently made before the root cause is identified. Mechanics often replace components such as the thermostat housing, coolant temperature sensors, or related assemblies, not realizing the coolant reservoir heat damage is the underlying cause. This results in unnecessary repairs, significant consumer expense, and extended vehicle downtime.This defect poses a serious safety risk, as coolant loss can result in: •Engine overheating •Sudden loss of power •Potential engine failure while driving •Increased risk of breakdown in traffic or unsafe driving conditions Numerous owners report similar failures, indicating this is not an isolated incident but a widespread design flaw affecting Jeep vehicles equipped with the 2.0L turbo engine.Jeep has not issued a Technical Service Bulletin or recall addressing the placement of the coolant reservoir or providing guidance to technicians to inspect for heat-related degradation in this area.I am requesting that NHTSA investigate this design defect and require Jeep to issue a Technical Service Bulletin or recall addressing this. The vehicle was properly maintained and not modified and The issue occurred at relatively low mileage.

Bolts came loose on thermostat housing caused all the fluid to leak out when looked up seems to be a common problem on these jeeps

While operating the 2021 Jeep Wrangler under normal driving conditions, I experienced repeated overheating issues. A high-pitched noise was consistently heard coming from under the hood during operation. Simultaneously, the engine temperature gauge would spike to high, and the infotainment system displayed an engine overheating warning. When the vehicle is started from a cold start - the high pitch is constant. To prevent damage or risk of fire, I immediately pulled the vehicle over and allowed the engine to cool. Upon restarting, the overheating issue persisted, with the temperature gauge rising and falling erratically—up to four times during a 15-minute drive. I brought the vehicle to an authorized Jeep dealership service center for inspection. The following findings were documented: Coolant System: High-temperature coolant reservoir found completely empty. Low-temperature reservoir found low on coolant. Evidence of coolant leakage at multiple coolant line fittings. Engine Block: External head gasket leak observed. Pressure test confirmed leaks in coolant lines. Internal Engine Inspection: Spark plugs were removed and coolant residue was found in the combustion chambers. Cylinder walls showed damage consistent with overheating. Slightly burned valves noted during inspection. Based on the findings above, the engine has suffered critical failure due to overheating and internal coolant leakage. The combination of external gasket leaks, coolant residue in the cylinders, damaged cylinder walls, and burned valves presents a serious mechanical and safety concern. Full engine replacement is required. Estimated cost: $16,000.00 This engine failure may pose a significant safety risk due to: Sudden loss of power while driving, Potential engine fire from overheating, Exposure to steam or hot coolant under hood Risk of engine seizing while on motion.

The contact owned a 2021 Jeep Wrangler. The contact stated that while driving at an undisclosed speed, the vehicle lost automotive power. No warning lights were illuminated. The vehicle was started, however, the vehicle failed to start as intended. The contact drifted the vehicle to the shoulder of the road. The contact stated the rear of the vehicle was filled with smoke. The contact exited the vehicle. The contact stated that within five minutes, the fire was coming from the hood compartment. The vehicle was towed to the local tow yard. The vehicle was condemned as a total loss. The contact referenced an unknown recall repair, which had a similar failure description, however, the contact's VIN was not associated with the unknown recall repair. The manufacturer was not made aware of the failure. The failure mileage was 28,000.

I experienced an extreme coolant leak caused by the coolant inlet tube fasteners backing out and becoming loose. This is consistent with MOPAR recall CSN ZD8 for 2021-2022 Jeep Wrangler. My vin does not seem to be covered by this recall but experienced the same issue. I request that the VINs be extended to include my VIN. [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Since we have had the high pressure fuel pump recall completed/replaced, there have been ongoing problems with the cooling system that cause overheating multiple times, on the same grade of road, during subsequent trips. The vehicle alerts and says it has overheated, and is stopped and allowed to cool off. Coolant is indeed low, but there are not any visible leaks and there is no puddling or areas where it appears to be leaking. We have had this issued looked at twice, several repairs completed, hoses replaced, reservoir replaced, and we are still having this issue. This appears to be something exclusive to the diesel motor, as we have friends with the same vehicle with gasoline engine that are not having this concern.

2021-2024 jeeps with 3.6 penstar are being sold with camshafts that go bad at around 60-80k miles. There needs to be an immediate recall. I have mine at just under 70k and recently had to spend 3 grand to get it fixed with a new part all because the warranty is up and there’s no recall out for it. This is absolutely unacceptable.

I have a 2021 Jeep Wrangler JL--VIN [XXX] . On Wednesday, [XXX], the vehicle suddenly and without prior warning overheated. I immediately parked the car. There were no obvious signs of leaks but we went and got some coolant and I put about 1/4 gallon of coolant in as it was low. I had the car towed to the dealership. The service advisor informed me that the issue was related to TSB 07-001-22 REV. B. They had to tighten the bolts connecting the inlet tube. As I searched on some Jeep Forums, I discovered that this issue was addressed with CSN ZD8, however, it's only applicable to certain VINs within 2021-2022. When I mentioned this to the advisor, she said my car wasn't affected by the recall. Clearly, this is a broader issue than just the VINs noted in the recall since this exact issue happened to my vehicle. I reached out to FCA and was assigned a case manager. After speaking with her, she informed me that she just talked with the dealership possibly providing cost assistance with the matter. I don't know why they're putting it back on the dealership when it's clearly a manufacturing defect. The dealership covered about 1/2 of the cost. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The contact owns a 2021 Jeep Wrangler. The contact stated while driving at an undisclosed speed, the vehicle stalled. The contact stated that several warning lights were illuminated on the instrument panel. The vehicle was able to restart however, the failure recurred. The dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 60,986.

VESSEL CONTINUES TO SHOW OIL PRESSURE WARNING LIGHT WITH NO OBVIOUS CAUSE - OIL PRESSURE IS WITHIN RANGE AND OIL IS NOT LOW NOR LOW LIFE?

Vehicle shut down while driving multiple times

The contact leased a 2021 Jeep Wrangler. The contact stated while his daughter was driving 65-70 MPH, the wheels locked-up. Several unknown warning lights were illuminated. The contact's daughter was able to pull over to the shoulder of the roadway. The vehicle was towed to the dealer, where it was diagnosed, and the dealer determined that the failure was related to NHTSA Campaign Number: 22V865000 (Engine). The dealer performed the recall repair, and the wheels unlocked. The contact stated that while his daughter was driving 55 MPH, the failure recurred. The vehicle was towed to the dealer, where an unknown repair was performed; however, the contact declined to take the vehicle back due to safety concerns. The manufacturer was notified of the failure. The failure mileage was approximately 18,000.

I have tried out to Jeep for asking if the open recall issue can be fix they do not have any solution how to fix the issue and no necessary parts are available with the dealer or even with Jeep itself.

There is now some slippage in 2nd and 3rd gear The recall was re-issued in March of 2023. There has been no remedy nor any other offer to allow for a customer instigated solution to this dangerous problem since then.

Check Engine Light and Excessive Engine Coolant Leak; Inspected by a manufacturer dealer and seller dealership; Initial dealer stated it wasn't drivable due to the amount of coolant leaking as part of the tubing was melted due to improperly being afixed and being to close to the exhaust; Yes. The same issue was reported 3 times before the issue I had in regards to the check engine light and a recall on the coolant leak was indicated to be fixed in March 2023 but continued to be an issue now; Warning light for the check engine appeared the same day I brought the vehicle in.

The contact owns a 2021 Jeep Wrangler. The contact stated while reversing approximately 5 MPH down the driveway, the contact slowed and stopped to place the vehicle into drive and the vehicle stalled. The contact stated that the drive (D) light was flashing. The contact stated that she placed the vehicle in park (P), and several attempts were needed to restart the vehicle. The contact stated that the failure was intermittent but had occurred several times. On one occasion, the vehicle stalled while making a turn at an intersection. The contact stated that when the vehicle stalled, the vehicle was in “Electric Mode”. The contact had not taken the vehicle to a local dealer. The vehicle had not been diagnosed nor repaired. The contact stated that NHTSA Campaign Number: 22V865000 (Engine) repair was performed in 2022 and related the failure to the recall. The manufacturer had not been informed of the failure. The failure mileage was approximately 18,000.