What 71 owners told NHTSA about the 2021 Jeep Grand Cherokee L

This is the second time I got into an accident and the (ADAS) made me crash.. I was far enough to brake safely but the system keeps me going forward..it drags me as if there is ice on the ground..if it was off my car would not have been in any of these accidents..this feature is not safe..I feel like my life is in danger when it is on

NHTSA ODI 11743798

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.

NHTSA ODI 11728679

ABS , Traction Control, Power brake booster, AEB inoperative after routine brake pads/rotor service. Vehicle was put into service mode via touch screen radio, rear brake service performed. Upon initial brake pedal application, required to exit service mode for rear brakes, to return caliper piston contact to brake pad. The vehicle disables abs and supporting system and sets codes c0050 , c2227 . As a technician my opinion is the extra brake fluid required to take up open space after service is discharged via accumulator into the brake system with no resistance or pressure due to caliper pistons expanding to the brake pads. These faults render the power brake boost abs and multiple other safety systems inoperative until a dealer level scan tool can perform abs initialization, and a hydraulic prove out test, and clear all codes, even with all code cleared power brake boost was lack just at best on initial test drive after service. A basic routine service should not affect a vehicle as adversely as this. While dealers may know what's going on your independently run shops and DIYers may return unsafe vehicles to customers/owners. This is the 3rd vehicle I have personally experienced this with. I will up load separate reports with those vins accordingly.

NHTSA ODI 11649365

Started my car and all brake lights came on. I had no brakes, brakes wouldn’t pump. Luckily I was a few miles from a Jeep dealer, they said it needed a brake module system, $1100 to repair. I have 56,000 miles and it is not under warranty.

NHTSA ODI 11637359