2021 Porsche Taycan transmission problems

Filed Sep 29, 2026 · Acceleration, Electrical · GA

While driving at approximately 90 mph on XXX on the highway, my 2021 Porsche Taycan (VIN [XXX], 51,730 miles) displayed an electrical system error with the turtle (reduced power) icon. The car received all loss of acceleration, warning message to pull over to a complete stop, and was able thankfully to pull over safely to the shoulder. I took the vehicle to Porsche Atlanta Perimeter on XXX. The technician found fault code P0E9D00, DC/DC converter current circuit 2 short to ground, with an active red warning "Electrical System Fault - Stop Vehicle Safely" stored in the front (A49) or rear (A50) high-voltage power electronics control units. The dealer referenced Porsche Technical Information bulletin TI 2791. The technician reprogrammed both control units, raising the software level from 0021 to 0023, cleared the faults, and test drove 15 miles without reproducing the concern. My VIN is not included in recall [XXX] (AMB5 software error causing loss of motive power), but the symptoms and the fix appear closely related. The dealer also performed warranty reprogramming of the onboard charger, driver assistance, and 12V battery sensor control units during the same visit. I am reporting this because the vehicle may be affected by the same defect while falling outside the recall population. No crash or injury occurred. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Dec 11, 2024 · Transmission · CA

Vehicle LOST PROPULSION while driving on the road. The motor (traction inverter) abruptly started to vibrate very aggressively, then the error warning "ENGINE CONTROL ERROR" flashed on the cluster display. The car immediately stopped responding to the gas/drive pedal and quickly coasted to a stop. After a full power-off then back on, the car woke back up like normal - as if nothing had happened. Happened twice now, each time within a few minutes of starting the car. This vehicle is NOT SAFE TO DRIVE at the moment.

Filed Jul 25, 2024 · Transmission · CA

Car lost ability to accelerate (motive power) while driving. Depending on the situation, this can be extremely dangerous. I brought my car to Porsche 4+ times with this problem, they attempt to fix it, but the problem returns.

Filed Feb 19, 2024 · Transmission · NC

Received "Engine Control Error" in red, where entire vehicle shut down and I had to stop and restart the vehicle for it to move. This happened twice in the span of 4 miles.

Filed Aug 12, 2023 · Transmission · GA

Owned the car for 6 months and driving down highway and car just shuts off, limited braking and no accelerator. Coasts to a stop and then stops in the middle of the highway. My daughter and i were almost killed by the car behind us. Had to run across highway to get to safety. Porsche North America says this is just a service issue and not a safety issue. Google search reveals this is a widespread problem and not an isolated event as was told to owner. This was my 6th porsche and my last. Was told the power converter from AC to DC was fried and replacement part took almost 4 weeks to get and replace. No prior warnings lamps or indication that something was about to fry and cause the car to become inoperable.

Filed Dec 11, 2022 · Electrical, Engine · WA

Spontaneous shutdown of the vehicle while driving. Critical failure of motility while driving. Driving at 50km per hour extremely dangerous as car just shutdown and I had to try to roll off the road but it died so I had to put it in neutral and push it by hand on a busy road. Car has been at the dealer for 3 weeks now. The spontaneous shut occurred and a red light came on.

Filed Dec 3, 2022 · Transmission · CA

There have been four total episodes when the car would not accelerate when the acceleration pedal was pressed. The last time it happened (late October 2022) the acceleration was very sluggish and I barely made it home. This happened on a residential street, and continued for 10+ minutes. If this power loss occurred on a highway, it could have lead to a very dangerous situation. There were no errors/warnings on dash. I brought the car for service to address this issue on Nov 2nd to Porsche Irvine. They told me that they identified a problem and had to replace "rear control unit" but since it's not available, they cannot provide ETA and car is still in service for 30 days now.

Filed Sep 22, 2022 · Driver assistance, Transmission · HI

The car experiences issue, after issue, including but not limited to collision alert warning not functioning, lane change assist failure, and the alarm sounding (disturbing the peace). As Porsche fixes the issues one by one, other matters emerge. The latest is the antania, and communications.

Filed Jun 26, 2021 · Electrical, Engine · OH

This has happened more than once now. I got in the car and as soon as it attempted to start up, I received the following error: “ELECTRICAL SYSTEM ERROR” I was not able to put the car in R or D. There was no other option to start the car. My car is 2 weeks old with less than 750 miles. Porsche has experienced a lot of these problems over the last 12+ months, yet this issue has not been resolved or acknowledged by Porsche. I am afraid for my safety because if this happens on the road or in traffic, there will be no way of moving this car out of the way.

Filed Jun 17, 2021 · Transmission · TX

I bought the car on April 22, 2021 and driven the new car approx. 250 miles and on a short trip of 2 miles, the car stuttered and shook briefly and a yellow warning light appeared on the main dash. It said something like "engine control issue, is drivable, take to workshop" so I proceeded, a mile later I pulled into the driveway of a relative and the yellow warning turned red and started beeping repeatedly. It said the "car could not go into park". I blocked the back wheel and turned the car off, locked it and came back about 3-4 hours later. The beeping started again and the red warning returned. It started and went into reverse but died once the car was in the street. Put in neutral and pushed to the curb. Tow truck Porsche sent took car to dealer on May 9th and they checked it into service on the following day. It has stayed at the dealer service center ever since and counting today, that is 37 days. Finally, they are shipping a new transmission from Germany to install in the car. They have tried several attempts to fix and shipped a shifter motor from Germany that did not fix the issue. At this point I do not think they know, for sure, what is wrong with the car. I have requested that Porsche North America buyback the car so I can buy another one. They keep telling me to be patient while they investigate and go through their processes. We are nearing 6 weeks of no progress.