2021 Jeep Wrangler: ABS light or ABS activating

Filed Nov 14, 2025 · Brakes, Electrical · FL

While driving at highway speed on November 11, 2025, my 2021 Jeep Wrangler experienced a sudden and complete electrical failure without warning. A “Battery Saver Mode” message appeared, and within seconds multiple safety systems began shutting down. First Failure: While driving on the highway and exiting, the vehicle abruptly lost power steering, ABS, stability control, airbag system, exterior lighting, dashboard displays, and engine power. Multiple warning lamps illuminated at once. Steering and braking became extremely difficult, creating an immediate safety risk. I was able to coast to a stop and park. The vehicle then appeared stable and the messages cleared. Second Failure: After restarting the vehicle, the warning reappeared. While driving on a major high-traffic roadway, the vehicle experienced a total electrical shutdown in active traffic and would not restart. Third Failure: A towing service attempted to jump-start the vehicle; it briefly powered on, illuminated nearly every warning light, then immediately shut down again with the radiator fan running at full speed. The electrical system continued to collapse and the vehicle required a full tow. Inspection and Diagnosis: The dealership confirmed a complete alternator and charging system failure at approximately 36,419 miles. This failure occurred at only 4 years of age, which is unusually early for an alternator or charging system failure. The vehicle’s original battery also failed unusually early (at only 2.5 years old) without warning, which may have been an early indication of a charging system issue. The vehicle is lightly used, garage-kept, never off-roaded, and regularly maintained. The sudden loss of steering assist, braking assist, airbags, lighting, and engine power at speed and in high-traffic areas created an extreme safety risk for myself and others. This appears to be a premature electrical system failure and may relate to broader charging system concerns reported in similar vehicles.

Filed Jun 17, 2025 · Acceleration, Engine · TX

June 5, 2025 stopped at red light turned green tried to turn left and the jeep flashed the electric red bolt symbol and check engine light came on lost all power would not go when gas pedal was pushed. a/c lost power started blowing hot air and engine turned off. Restarted engine finally got it to go enough to pull out of traffic. Turned off engine opened hood checked battery cables, fuses and all was intact. Started engine drove slowly to the Autozone store to have the diagnostic test done and it showed P2101 power train system throttle actuator A control motor circuit range /performance detected unexpected voltage on the throttle actuator control motor circuit also C121C-00 ABS torque request signal denied Anti-lock Brake System U0401-00 implausible data received from ECM/PCM “A”. System was reset to be able to drive home. 6/16/25 went to start jeep to go to work made a clicking noise check engine light on and the voltage warning sensor flashing and showed Service Electronic Stability Control error would not stay running checked battery cables fuses and restarted engine tried to back out of driveway engine would not go. Had jeep towed to Moore CDJR dealership where it was purchased from 9/2023 to have serviced found throttle body needs replaced dealership contacted several parts dealers, Mopar, and other dealerships etc. to locate the part needed was advised couldn’t find the parts needed for the repair. Contacted service department and they advised they were calling National Auto Care my extended warranty for approval for repair. My concern is if I had been driving 65 mph and it went out I would have been in a accident when the vehicle stopped functioning. Safety of myself and other drivers would have been compromised. This is the 2.0L Turbo motor and have been advised that there are several issues with this motor and should trade in vehicle. I don’t have that option and this is the only vehicle I have.

Filed Jun 23, 2024 · Acceleration, Brakes · NV · crash

While driving my vehicle in four-wheel-drive low, with no lockers engaged I noticed that the rear wheels at different times were dragging, I could also hear and feel the ABS module actuating. During these events I would have diminished breaking capabilities and no ABS warning lights. it was doing it under 5 miles an hour at first and then higher speeds. I got a service ABS, service traction control, service stability control, four-wheel-drive unavailable, service four-wheel-drive system Messages all of a sudden, and i disengaged the four-wheel-drive lover back to 2 Wheel Drive. At this point the brake pedal was hard and would not move, my back left wheel was completely locked. I shut the vehicle down waited a few minutes and restarted it, all of the lights were still active but I was able to move the vehicle. I began traveling forward and the rear wheels alternated locking up. I started backing up to move to a safe position, the brake pedal became hard and I was unable to stop causing my vehicle to collide with a wall, speed was below 5 miles an hour but still caused damage to my left rear quarter panel and fiberglass top. After we assessed the damage, I put the vehicle in 2 Wheel Dr., disconnected the battery for 30 minutes, and was able to drive the vehicle to a parking lot in 2 Wheel Dr. After this point and not having phone service, use a satellite communicator to call a local off-road recovery nonprofit that I volunteer for, they were able to assist in bringing a trailer out to tow my vehicle home as it is unsafe to drive and my children were with me. Unloading the vehicle off the trailer all the lights were gone with the exception of a check engine light is now on. The vehicle is currently sitting in my driveway and will be requesting a tow to the local dealership for them to troubleshoot .

Filed Oct 11, 2023 · Brakes · OH

I was casually driving home from work in a 35 MPH zone on a standard road. When my 2021 jeep wranglers 4xe (30,000 miles exactly) ABS, and electronic brake stabilizer warning lights came on. I touched the brake and they were non-responsive. I then continued to press the brakes all the way to the floor multiple times and there was no response. I was able to pull the emergency brake to bring the vehicle to an immediate halt in the middle of the road and have a tow truck come ASAP. Service the next day said all the warning lights are gone and that they do not see any history of the errors. This issue posed extreme risk for myself and my pregnant wife. The car is still at the service specialist as i requested additional diagnosis be performed.

Filed May 30, 2023 · Brakes · 28,000 miles · CA

The contact owns a 2021 Jeep Wrangler. The contact stated while driving 30 MPH, the braking system failed to operate as designed with the anti-lock braking system (ABS) and electronic stability control (ESC) warning lights illuminated. Due to the failure, the vehicle was towed to the dealer where two attempts were made to replace the ABS; however, the failure persisted after the repair. The manufacturer was informed about the failure and acknowledged that the failure was a known issue with the model vehicle; however, there was no fix for the failure. The vehicle was not repaired and remained in the possession of the dealer. The failure mileage was approximately 28,000.

Filed Jul 22, 2022 · Brakes, Electrical · 15,000 miles · IL · crash

The contact owns a 2021 Jeep Wrangler. The contact stated that while at a stop light and attempting to accelerate, the vehicle would not drive forward and the gear shifter lights began blinking. Suddenly the vehicle would lurch forward and backward crashing into both the vehicles in the front and rear and a third parked vehicle before finally the driver was able to shift into park and turn the vehicle off. During the incident, the Stability Control, ABS, and Traction Control warning lights had illuminated. The vehicle was later driven to the police station but the warning lights were still illuminated. During the incident, no injuries were reported and a police report was taken. The manufacturer was contacted and later retrieved the vehicle for evaluation. No further information was available. The local dealer was also notified of the incident. The failure mileage was 15,000.

Filed May 20, 2022 · Brakes, Electrical · RI

Driving at approximately 50 MPH, I lost power steering and the indicator/warning lights on my dash, including ABS, were all lighting up or seemingly resetting. I was able to limp it home when I regained power steering about 20 feet from the driveway. So at the moment, it's not possible to observe the issue. Loss of power steering at that speed to a less experienced driver than myself, such as one of my children could have proven catastrophic. I am currently having the vehicle towed to the dealership. There was no prior indicator or warning before the incident occurred. ~ I did a quick search on what the problem could be and found this video on youtube (not mine) which shows almost exactly what happened to my vehicle ... https://youtu.be/Sewnurqrzq4 (I know clicking links isn't always allowed, so what I searched youtube for was "2021 jl loss of power steering and all warning lights on" and the video was the first result uploaded by a user by the name of Robert Ballard. The video name is "2018 Jeep JL Unlimited Rubicon Electrical Issues" and was uploaded Jun 25, 2019. )

Filed Oct 4, 2021 · Brakes · TN

New vehicle brake failure. Dealer Replaced Master Cylinder defect. Pedal goes completely to floor occasionally no brakes. HCV now determined possibly bad. ABS system affected. Continuous occasional pedal goes to floor. Been reported and serviced by dealer at least 4 times. Problem continues sporadically. Begin within 2 weeks of purchase. Vehicle should be replaced for safety issues.