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)
2021 Porsche Taycan: sudden loss of power
7 of the 71 complaints about the 2021 Porsche Taycan describe sudden loss of power.
- owner complaints
- 7
- of this car's complaints
- 10%
- recalls
- 1
Sudden loss of power by model year
What owners say
When accelerating the has a sudden loss of power. I get a message to pull off the.road. After turning offf the engine and restarting car begins to function properly again.
when push the pedal little hard from slow driving, i get the warning: " Engine control error, park vehicle in a safe place" and the car goes dead and lose power. it happened few days ago on the highway, the car stopped responding and i got that warning, luckily there was a shoulder on the highway to park the car, otherwise it would be very dangerous, i turned the car off, waited about 2 minutes then turned it on, all worked, i could drive it carefully back home, called the porsche dealer about the issue and got an appointment to see what is going on with this problem.
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.
I was driving on high 495 in MA at approximately 05:00 in the far left lane at ~75MPH. The car had a sudden loss of power. There was zero propulsion. I had to quickly cross 3 lanes on the highway to the far right side; I was not able to pull off to the left because there was no breakdown lane. Once I came to a complete stop, I power-cycled the car and it resumed normal operations. I was able to keep driving with full power and no apparent residual effects. I did not take a picture, however this link shows the error message I received: https://www.taycanforum.com/forum/threads/motor-control-error-and-system-error.3114/
While driving i experienced a sudden loss of power, I was traveling on an interstate going approximately 75 mph when the car suddenly and without warning came to a sudden stop by itself causing multiple cars to swerve and endangering myself and multiple other drivers. The car restarted shortly afterwards however I was at a complete stop in the middle of traffic, I then experienced this problem yet again, this time I was going slowly; however, I was in the middle of an intersection and had to once again restart the car after it experienced a sudden loss of power and stopped itself.
While driving on a highway at about 60 MPH, the a warning message appeared stating "electrical system error / park vehicle in a safe place." fortunately was able to maneuver vehicle to the shoulder before losing responsiveness. Vehicle then went into park status with no ability to drive. Then received message that 12v battery is low. Very unsafe because vehicle suddenly lost power in a high-speed driving situation
Service bulletins that may apply
- Allocation of Approved Engine Oils MY 2027 (13/26)
- Overview of Approved Porsche C40 Engine Oils (18/26)
- Overview of Approved Porsche C20 Engine Oils (17/26)
- Overview of Approved Porsche C30 Engine Oils (16/26)
- Overview of Approved Porsche A40 Engine Oils (15/26)
- Overview of Approved Porsche C40 Engine Oils (21/26)
- Overview of Approved Porsche C30 Engine Oils (19/26)
- Overview of Approved Porsche C20 Engine Oils (20/26)
Related recalls
Engine and engine cooling: engine: engine control module (ecu/ECM): software
- What is wrong
- Porsche Cars North America, Inc. (Porsche) is recalling certain 2020-2021 Taycan Turbo, Taycan Turbo S, Taycan 4S, 2021 Taycan, Taycan Cross Turismo, Taycan Turbo S Cross Turismo, Taycan 4S Cross Turismo, and Taycan Turbo Cross Turismo vehicles. The monitoring software can incorrectly detect a fault and shutdown the power train, causing a loss of motive power.
- Risk
- A loss of motive power increases the risk of a crash.
- Remedy
- Dealers will reprogram the power electronics and the engine control unit, free of charge. Owner notification letters were mailed July 30, 2021. Owners may contact Porsche customer service at 1‑800‑767‑7243. Porsche's number for this recall is AMB5.
Recall number 21V486000 · Recall details
Questions about the 2021 Porsche Taycan loss of power
Is sudden loss of power a common problem on the 2021 Porsche Taycan?
7 of 71 owner complaints about the 2021 Porsche Taycan (10%) mention sudden loss of power. The model year with the most reports is 2020.
Is there a recall or service bulletin for this on the 2021 Porsche Taycan?
There is 1 recall and 80 service bulletins for the same area of the car. Check them below with your VIN.
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