Automatic Transmission Control Module problems of the 2023 Jeep Grand Cherokee

Vehicle was charged to full overnight. Vehicle was warming up in the garage on the charger in ev mode for approx 20 minutes. Vehicle cabin was warm when unplugged and put in reverse. Vehicle struggled to get through minor snow until traction control was turned off even with being set to "snow" mode (excessive slip). Outside temperature was -1 at the time (well above cold weather operating temperature) when ev powertrain immediately ceased. The vehicle then went into a limp mode. After 20 minutes or so the gas engine functioned normally and the vehicle was on the road without any ev power (regenerative braking was restoring additional battery). Stopped at dealership on my way to work to have a dtc code analyzed from when this event occurred and it was tcm-p1d97-00 incorrect gear ration: clutch a or d defective. The vehicle has exhibited transmission hiccups and been reported, so this appears to be a symptom of a consistent problem. At some point I recall the vehicle engaging the parking brake automatically, and the shifter demanded I put the vehicle into p to select my gear. It took a brief moment to understand what the car was doing, but I still have no idea why it did it. I followed the standard procedures of press brake while in park, push parking break lever/button until it disengages, but it put itself back into park a couple times before finally driving. I turned the vehicle off and on a couple times during this event as that is what stellantis has said to do when the vehicle isn't fully operable. It was just a weird scenario of me doing the same steps to engage drive while the vehicle went back to parking brake mode until it finally stopped fighting me. The ensuing drive to work seemed normal. I did not hear or feel anything abnormal other than the complete lack of ev power. Thankfully the event occurred in my subdivision where no other cars were impacted by my vehicle's lack of mobility or determination to stop in its tracks.

My 2023 Jeep Grand Cherokee has a persistent, intermittent grinding or rumbling noise during moderate acceleration, most often under load such as going uphill. The noise has been documented over seven service visits and confirmed in writing by two separate Jeep dealerships, yet Jeep claims they cannot replicate it consistently. In 2024, my husband experienced violent jerking during upshifts at highway speeds, forcing him to restart the vehicle to restore normal operation. While that specific event has not repeated, the grinding/drivetrain issue continues, with no warning lights or diagnostic codes. The defect has persisted for more than a year, despite extensive service attempts, and raises serious safety concerns — particularly if the drivetrain locks up or loses power while driving. Jeep has not resolved the issue and is attempting to close my case without a fix. Case no. 93653073 is on file with Jeep/stellantis customer care. Dates of service visits: repair history 6/12/24 (1 day) – rhythm Jeep – unable to replicate 6/19–7/23/24 (35 days) – rhythm Jeep – replaced faulty resonator 8/1–8/2/24 (2 days) – rhythm Jeep – replaced exhaust assembly 9/21–10/2/24 (12 days) – rhythm Jeep – pcm update, cam/crank relearn, star case s2309000002; noise confirmed 10/30–11/11/24 (13 days) – rhythm Jeep – replaced motor mounts; vibration noted 11/27–12/17/24 (21 days) – rhythm Jeep – tcm reprogrammed and quick learn 7/12–7/15/25 (4 days) – freeland Jeep – transmission tech assigned; grinding confirmed total days out of service: 88. No warning lights, no stored codes.