2021 Jeep Wrangler: false forward collision warnings

Filed Mar 14, 2026 · Driver assistance, Engine · NJ

My 2021 Jeep Wrangler Rubicon (3.6L eTorque, automatic transmission) has had recurring drivetrain instability since about 2,000 miles while under factory warranty. It intermittently has high RPM flare during acceleration, delayed shifting, shuddering under load, and abrupt engagement. At low speeds (about 10–5 mph), it harshly downshifts, grabs suddenly, RPMs jump up and down, and it can feel like it will stall; it has stalled intermittently. Braking feels inconsistent, and at times it feels like the vehicle resists braking or surges before slowing. The forward collision warning/automatic emergency braking has activated with no obstacle present, and the power steering assist has been lost intermittently. There is also an engine tick and a high-pitched whining noise from the engine/drivetrain area. In January 2026, the transmission catastrophically failed and required replacement of the transmission, torque converter, cooler, and control module. The vehicle was out of service for over 24 days. After installation of a new Mopar remanufactured transmission and torque converter, the same symptoms returned. AAMCO has now found that the new torque converter failed, with metal shavings throughout the transmission, in the fluid, and at the bottom of the pan. I was advised that the vehicle should be sent to a Jeep dealership because no codes are currently present. I was also advised that the dealership may replace only the torque converter rather than the entire transmission, despite recurring failure and metal contamination. This presents a safety concern due to loss of acceleration, unpredictable torque engagement, stalling, unintended braking activation, power steering loss, engine/drivetrain noise, and repeated drivetrain failure. I have all the records if requested, file is too large to send in the upload area.

Filed Mar 2, 2026 · Driver assistance, Engine · NJ

My 2021 Jeep Wrangler Rubicon (3.6L eTorque, automatic transmission) has experienced recurring drivetrain instability beginning at approximately 2,000 miles while under factory warranty. The vehicle intermittently exhibits a high-RPM flare during acceleration, where the engine speed increases without a commensurate increase in vehicle acceleration. The transmission then abruptly engages, causing sudden jerking. At low speeds (approximately 10–5 mph), the vehicle shudders and harshly downshifts, creating a sudden grabbing sensation. Engine RPMs fluctuate during deceleration as if the transmission cannot smoothly match engine speed. Braking feels inconsistent, and at times it feels as though the vehicle is accelerating or resisting braking input before abruptly slowing. The vehicle has felt as though it would stall at low speeds and has stalled intermittently. Additionally, the forward collision warning / automatic emergency braking system has activated without an obstacle present. There have also been intermittent instances of loss of power steering assist. The engine has developed a ticking noise and a high-pitched ringing/whining sound from the engine area during operation. In January 2026, the transmission catastrophically failed and required replacement of the transmission, torque converter, cooler, and control module. The vehicle was out of service for over 24 days. Following installation of a Mopar remanufactured transmission and torque converter, the same symptoms have recurred, including RPM flare, delayed shifting, shuddering, harsh downshifts, unstable deceleration, and abnormal engine noises. These conditions present a safety concern due to loss of expected acceleration, unpredictable torque engagement, unintended braking activation, intermittent power steering loss, stalling behavior, and drivetrain instability. The vehicle is currently under further diagnostic evaluation. I have multiple documents, but the file is too large to upload

Filed Nov 16, 2024 · Driver assistance · TX

I had the most recent incident driving Westbound in the evening hours shortly before Sunset around October 10, 2024. It appears the sunlight from the setting sun triggered my adaptive cruise control and forward collision alert and triggered an alarm sound and activated emergency braking at the same time. I have had two previous incidents like this. One at the exact same location on my commute home at around the same time and maybe a week before. A third occurrence was on an Eastbound morning drive with the rising sun. All three incidents triggered emergency braking from a speed of ca. 65mph. I was able to react fast enough to deactivate the ACC by lightly pushing the brake pedal and could avoid serving or complete stopping of the vehicle. Luckily during all incidents I had no close traffic behind me, otherwise the incidents could have caused a rear end collision.

Filed Dec 30, 2022 · Electrical, Engine · 23,915 miles · CA

The contact owns a 2021 Jeep Wrangler. The contact stated that while driving at various speeds, the vehicle stalled with the output control and collision warning lights illuminated. The contact had taken the vehicle to the dealer on numerous occasions; however, the mechanic was unable to determine the cause of the failure. The manufacturer was not notified of the failure. The vehicle was not yet repaired. The failure mileage was 23,915.

Filed Feb 17, 2022 · GA

There is an option to engage "Full Regen Mode" to recharge the battery while driving in Hybrid mode. As I was driving with this on, i took my foot off the accelerator, so the vehicle slowed down under "Full Regen Mode" as it is supposed to. But then the front tires went over a pothole/break in the road, and the vehicle sped up instantly. This happened two more times, and in both instances the vehicle sped up on its own when it encountered a break in the road while on "Full Regen Mode" with my foot off of the accelerator. The third time was in a parking lot of a strip mall, where I would have crashed into the car in front of me if my foot was not already hovering over the brake pedal. The Advance Collision Warning system also went off, scaring everyone nearby, and I managed to brake hard. Now I have stopped using the "Full Regen Mode" option while driving in Hybrid mode.