2021 Jeep Grand Cherokee L

On April 24,2026 , as pull out my driveway heading to work only to get a 1/4 mile from home car stopped in highway. As I power and restarted tried to select a different gear never went in gear. Towed by to dealership as confirmed transmission was stuck with inly 67000. They replaced with new transmission & drive shaft, costing over $7,000. Warranty company paid part of rent car but still out of $300

When a car in front of me is slowing down while the adaptive crusie control is on and I have the distance set to 3 or 4 lengths, the farthest one available, and the adaptive cruise control is set, the car will start slwoing down like the cars ahead of me and if I switch lanes to go around of the car that is slowing down and there is another car in front of me of the lane I move into that adaptive crusie control acts as if there is no car in front of me in the lane and will begin to accelerate until I engage the brake. So for example I'm traveling in the far right lane of a four lane road, two going north and two going south. I have my adaptive crusie control on and set to 50 MPH and the distance set to 4 car lengths (max) and then the car in front of me starts to slw down. The adaptive crusie control will adjust and start to slow down as well. So I decide to get into the next lane over to my left, where there also happens to be another car 1 or 2 car lengths in front of me, the adaptive crusie control will not detect that car after lane change and will begin to accelerate back up to 50 MPH when it should still be slowing down to avoid a collision. This has happened multiple times.

I brought my 2021 Jeep Grand Cherokee L to the dealership for its scheduled ~40,000 mile service. During that visit, I specifically reported that something felt off with the transmission/drivetrain. The dealership inspected the vehicle and stated that no issues were found. Approximately one week later, the vehicle experienced a sudden and severe drivetrain failure. While driving approximately 45 mph on a surface street and accelerating to cruising speed, the vehicle began shaking violently. There were loud mechanical noises from underneath the vehicle consistent with components coming apart. At the same time, the vehicle lost all ability to accelerate. Pressing the accelerator produced no forward movement. Due to the loss of power, I was forced to coast out of active traffic and onto a side street where I was able to safely stop. The condition was sustained and the vehicle was not drivable after the incident. When attempting to assist the tow truck driver, I shifted the vehicle to drive and pressed the accelerator. The engine revved but the vehicle did not move. When shifting back to park, the vehicle displayed an error message: “Cannot shift to Park, vehicle moving too quickly,” despite being stationary. This failure created a safety hazard due to loss of acceleration and unpredictable vehicle behavior. This is particularly concerning because a drivetrain issue was reported during a service visit shortly before the failure and was not identified. There were no warning lights or messages prior to the failure. The issue occurred suddenly and without advance indication. The vehicle had recently been serviced and cleared by the dealership despite a reported drivetrain concern. A failure of this nature at speed could significantly increase the risk of a crash, depending on traffic conditions.

In May 2025 the vehicle randomly, and without warning, the instruments, gauges, and displays switched to Italian, changed to Metric, and we got the update and FCW Off light stuck on. Numerous other settings had been reset. Took to dealer and had to pay for the fix - they noted a STAR bulletin on my invoice. Then this past weekend (May 2, 2026) it happened again. At least this time it didn't go Italian and Metric on me, but lots of other settings were changed. Did not test the paddle shifters but will do that soon. Current software version says FCA-MY24.U29.42-PROD. I've seen other posts with a newer version - not sure if / why not on my Jeep yet.

While stopped at a red light, the auto start/stop feature of the vehicle failed to re-start the car causing complete failure. My wife was the first vehicle at a the light in a busy intersection with a [XXX] old in the vehicle. The electronics of the vehicle completely failed causing complete shutdown and unable to restart. Vehicle was towed after blocking intersection for 30 minutes. This has happened before but not for total and complete failure. This failure caused a complete battery drain leading to the need for two new batteries. The vehicle has a history of electronics/software issues and failures and associated start/stop system issues. This failure was diagnosed to be caused by a faulty relay and costed me $2000 in repairs. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Vehicle: 2021 Jeep Grand Cherokee L Issue Type: Electrical System / Loss of Power / Braking System While operating my 2021 Jeep Grand Cherokee L on Interstate 40 at approximately 70 miles per hour, with two minor children in the vehicle, the vehicle suddenly and without any prior warning began to rapidly decelerate, despite continued pressure on the accelerator pedal. At the time the deceleration began, there were no warning lights, alerts, or indications of any malfunction. The vehicle exhibited a significant loss of power, and it felt as though it was being mechanically restricted or “dragging,” severely limiting its ability to maintain highway speed. Only after the vehicle had already begun to decelerate did a brake system warning indicator appear on the dashboard. This sequence of events indicates that the warning system did not provide advance notice of the failure. This sudden and uncommanded deceleration created an immediate and serious safety hazard, particularly given the vehicle’s speed and surrounding interstate traffic. The inability of the vehicle to respond appropriately to acceleration input placed occupants at risk of a rear-end collision or other serious traffic incident. Although the warning indicator later turned off, the vehicle continued to operate abnormally, with ongoing reduced acceleration and diminished responsiveness. This incident occurred without prior warning, and the delayed activation of the brake warning indicator raises serious concerns regarding a potential defect involving the vehicle’s electrical, braking, and/or powertrain control systems, including possible failure of system monitoring or alert mechanisms. Given the circumstances including highway speed, sudden loss of propulsion, delayed warning notification, and the presence of child passengers. I respectfully request that this issue be formally investigated as a safety-related defect.