2021 Jeep Gladiator: check engine light

Filed Jul 11, 2026 · Driver assistance, Fuel system · NC

The vehicle was bought in CA and hasn't had any issues till about after 3-4 yrs later. 1) Adaptive cruise control / emergency braking system / forward collision notification will occassionally state "not availble/unavailable" or "visibility" is not available and to clean windshield, but the windshield is not dirty or obstructing the camera. 2) The fuel emission system has had several diagnostic codes referring to the gas gap or fuel sensors. Vehicle is boggs down/loses power and starts ideling roughly and acts like it wants to shutdown and has shutdown. I've had to get vehicle towed twice for this issue. Replaced gas gap and still had issues. Then they went away for a few months, but now I am getting a diagnotic code stating that the fuel tank gas sensor is causing the check engine light.

Filed Jun 11, 2026 · Transmission · LA

Engine light came on, vehicle went into limp mode. Transmission would not shift any higher than 3rd gear and kept slipping while on interstate! Was almost hit by several 18 wheelers! Jeep dealership said our vin is not part of the service bulletin but they did get the P0733 code! Make it make sense! I guess we’re supposed to get run over by 18 wheelers before they’ll fix it!

Filed Apr 27, 2026 · Electrical · OR

Complete failure and shut down of all systems while driving through an intersection. Result found by dealer: Frayed wiring harness on right side of engine rubbing near exhaust parts. Known problem in several models of Jeep due to TBS issued to dealers. Jeep failed in intersection in [XXX] and was able to coast to curb. Started later and was able to drive it back to Prescott, AZ with fingers crossed, took to York Jeep dealer for repairs. They have the repair file. Was 6 mos out of warranty but only about 12k miles ref: Case Number: XXX Release Date: 1/16/2021 Symptom/Vehicle Issue: Check Engine Light On, Service Shifter Message, No Crank No Start. Transmission Wiring Harness Chaffed Or Pinched Near Exhaust DPF Discussion: Initial complaint is that the Check Engine Light is illuminated, Service Shifter Message is displayed, and/or a crank no start condition exists. Upon scanning the vehicle for DTC’s you may find one or more of the following: P2453, P2454, P0335, P0336, P242B, P242C, U0074, U11C3. Diagnosis: Inspect the wiring harness near connector XY230A leading down to the transmission. The harness routing may allow the wiring to make contact with the sharp edge of the DPF gasket flange. It has also been found that the wiring harness could be routed close to the exhaust causing chaffing. Both of these situations could result in damage to the harness and a potential open or short. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jun 16, 2025 · Transmission · 119,000 miles · TN

The contact owns a 2021 Jeep Gladiator. The contact stated that while driving at an undisclosed speed, the transmission shifted abnormally roughly. Additionally, the contact stated that the transmission was slipping, and the vehicle was jerking abnormally. There was no warning light illuminated. The vehicle was taken to the dealer, where it was diagnosed with transmission failure. The contact was informed that the transmission needed to be replaced. The vehicle was not repaired. The contact stated that the check engine warning light illuminated while driving to the dealer, and the dealer reset the code. The manufacturer was made aware of the failure but provided no assistance. The contact was advised to contact the federal safety agency Hotline to report the failure. The failure mileage was approximately 119,000.

Filed May 19, 2025 · Engine · CO

Failed Right intake camshaft and roller rocker arm. Failure causes misfires and limp mode to be activated when trying to pass and accelerate and in my case was while going up a hill and unable to complete a safe pass of another truck. Known issue by Jeep and Stellantis as they have redesigned a kit for this specific part and upgraded software to increase pressure to the oiling system, but they have failed to replace parts and are 12000 orders behind on parts at ths current moment truck has been undriveable for greater than 45 days. Flashing check engine light and warning lights in place

Filed May 8, 2024 · Transmission · WI

Started hard shifting and then really struggled to shift and accelerate once I slowed down. Took to dealership and they said the transmission will need to be replaced. The engine light came on just shortly after the hard shifting and inability to accelerate.

Filed Apr 12, 2024 · Engine · 98,000 miles · WA

The contact owns a 2021 Jeep Gladiator. The contact stated that while operating the vehicle a valve knocking noise was present coming from the engine compartment, the check engine light had illuminated and the vehicle would not properly accelerate. The contact received codes that indicated an engine misfired in cylinder three and cylinder five. The vehicle was taken to the local dealer. The cause of the failure was not yet determined. The manufacturer was notified of the failures. The failure mileage was 98,000.

Filed Jul 21, 2023 · Driver assistance, Engine · AZ

It got 7 problem issues and almost lost control due to electronic throttle control failed while drove on freeway and tow teardrop (1400 lbs) . Malfunction indicator light, traction on (could not turn off), electronic stability control active popped up ( could not turn off), service forward collision warning light, cruise control fault warning light, service stop/start system warning light, service adaptive cruise control warniing light (all of them popped up that could not turn off). I went to jim click jeep dealership and they never seen them before. I am very disappointed and I feel that my truck is "lemon" I told them to fix asap but they can not fix and have to wait till august 9 (appointment) to check whats wrong.

Filed May 31, 2022 · Acceleration, Engine · MI

While towing a trailer the vehicle suddenly reduces power to less than half and multiple check engine lights appear. This seems to happen only when outside temperatures are above 80f. I went from going 65mph to 45mph within 1/4 mile which caused sudden traffic issues behind me. I have had the vehicle to the dealer multiple times and they do not find anything even though there are multiple engine lights. I have had it happen a over 8 times in 1 year. I also have a co-worker that has had the same issue.

Filed Oct 23, 2021 · Electrical, Steering · WI

This is the second occurrence I’ve had with this vehicle. While driving on a rural two lane highway, traveling approximately 60 miles per hour, my instrument cluster began to flash a “Service Shifter” warning. This warning was simultaneously joined by a check engine light, random readings of speed, rpm fluctuations, activation of the un-commanded activation windshield wipers, and intermittent loss of power steering. Video of this incident is available from when it occurred in May 2021 at 9000 miles, and again in October 2021 at roughly 18000 miles. It is unknown what system or components are causing this error. The first occurrence was cleared by reseating of fuses, however this second occurrence cannot be resolved so far. The vehicle has been in the shop for 12 days so far with no end in sight. The repair problem has been elevated to FCA by the dealership. My primary safety concern with this incident is the sudden loss of power steering. Should this had occurred to a less experienced driver, roads in poor condition due to weather, or higher speeds, this incident certainly could result in a loss of vehicle control.

Filed May 31, 2021 · Steering · WI

I have a 2021 Jeep Gladiator Sport S 3.6L with an automatic transmission. I have been the only owner of the vehicle and bought it new in February 2021. The vehicle currently has just over 9700 miles. The only modification done to the vehicle are new wheels and tires. Today while out for a drive the Jeep suddenly experienced a malfunction. All lights and indicators on the dash began to flash various lights, alarms and warnings. The check engine light, ABS light, and airbag lights came on, along with the ECM warning, steering and traction control lights. The fuel level showed zero, then full, the warning screen flashed messages including: Speed Control, Messaging Unavailable, Service Required- No Bus, then switching to Service Electronic Stability Control, and a BRAKE warning appeared. Next, and most alarming, the vehicle showed the error AUTO PARK DISABLED which resulted in a loss of power steering control. The vehicle would not shift correctly and the engine switched on and off with the transmission indicator flashing all gears and the windshield wipers starting on their own, finally rotating to "Service Shifter" before starting the cycle over. Because I was on a back country road I was able to make a safe controlled stop. Had this occurred on a busy highway there could very easily have been an accident from loss of control. I do have video of the screen flashes and wipers activating.