2014 Porsche Panamera Powertrain & Transmission Problems

I own a 2014 Porsche Panamera S E-Hybrid (VIN XXX). I experienced repeated hybrid system warning lights and high-voltage battery fault codes. I brought the vehicle to Porsche Atlanta Perimeter for a safety inspection. The dealership did NOT perform the required PIWIS Hybrid Battery Test Plan, did NOT check individual cell voltages, and did NOT assess the hybrid battery control unit. Instead, they provided a basic code scan and immediately recommended a $37,000 battery replacement without verifying the root cause. This is a high-voltage system handling 300+ volts, and an improper or incomplete diagnosis is a safety concern. Porsche headquarters was contacted by the dealership, but the dealership stated they received no technical support or guidance. Porsche appears unable or unwilling to diagnose early-generation hybrid vehicles properly, leaving customers without accurate safety assessment of the high-voltage system. I am filing this complaint because improper hybrid battery diagnosis can lead to thermal events, sudden loss of power, or misinterpretation of critical battery faults. I am requesting that NHTSA review Porsche’s handling of hybrid diagnostics for this model. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The contact owns a 2014 Porsche Panamera. The contact stated that upon start of the vehicle, the vehicle would unintentionally roll forward without warning. The contact also stated that the gear selector lights would flash during the failure. The contact stated that upon restart of the vehicle, the vehicle would temporarily operate as needed; however, the failure would return. The contact called the manufacturer and was referred to the dealer for assistance. The dealer informed him that there were no recalls on the VIN related to the failure. Upon investigation, the contact linked the failure to NHTSA Campaign Number: 19V446000 (Power Train). The vehicle was not repaired. The failure mileage was approximately 144,000.

Car engine frequently stalls while driving, usually at stop or slow speed (e.g. intersection). Electrical system remains on; turning off and on ignition will restart car and allow driving. Had problem investigated and was told it was a transmission sensor which was repaired but failed to fix problem. Re-investigation identified transmission failure due to sensor in sealed transmission required replacement.

MY 2014 PANAMERA 4 STARTED HAVING THIS ISSUE ON 10/09/2019. I PLACED THE CAR IN PARK AND FOUND THAT THE CAR WAS STILL MOVING LIKE IT WAS IN NEUTRAL. I HAVE TO SET THE EMERGENCY BRAKE ON THE CAR BEFORE LEAVING IT OR IT MIGHT ROLL DOWN THE STREET AND INTO TRAFFIC. IT SOUNDS LIKE IT HAS TO BE TIED TO THE RECALL 19V-446.

MY CAR A PANAMERA S 2014 IS SHOWING THE ISSUES PRESENTED IN THE SAFETY RECALL 19V-446. IF I MOVE THE SHIFT LEVEL TO "PARK" POSITION AND REMOVE THE IGNITION KEY, THE CAR IS NOT REALLY IN "PARK". IF THE THE CAR IS IN A SLOPE IT WILL MOVE. I PUT MY VIN NUMBER IN YOUR SITE AND PORSCHE SITE AND IS INDICATED THAT THERE ARE NO RECALLS FOR MY CAR. MY CAR IS DOING THE PROBLEM DESCRIBED IN THE SAFETY RECALL AND IS WITHIN THE RANGE OF PANAMERAS WITH THIS ISSUE ACCORDING TO YOUR RECALL, BUT I DON'T UNDERSTAND WHY MY CAR IS NOT INCLUDED. I CALLED MY LOCAL PORSCHE DEALER AND THEY TOLD ME THAT GIVEN MY VIN NUMBER HAS NOT BEEN FORMALLY RECALLED BY PORSCHE THEY CAN'T HELP ME. THIS SITUATION MIGHT CAUSE AN ACCIDENT IF I FORGOT TO USE THE "PARKING BRAKE" OR IF THE "PARKING BRAKE" FAIL. THIS IS A SERIOUS RISK OF ROLLAWAY, THE CAR CAN UNEXPECTEDLY MOVE. I NEED YOUR HELP TO INCLUDE MY VIN NUMBER IN THIS RECALL.