There are currently hundreds (if not thousands) of cars, operating on roads of USA, that at any particular time stop in the middle of the road. The power is cut off and Engine Control Error is displayed on the monitor. This issue has been described many times on Reddit, under Taycan-Engine Control Error threads. The affects 2020-21 Porsche Taycans. As an owner of '21 Taycan, I have run into this issue 8 times in the past 4 months. I have been lucky so far not to cause any incidents. I've brought in my car 3 times to Porsche dealership. The first time, a fix was made, but it did not do anything. The second time I brought it in, I was told that there is a transmission issue, but since the dealership can't replicate this issue, they can't fix it. After the second attempt, I contacted Porsche headquarters, looking for resolution. The customer service requested for me to bring the car back to dealership for additional analysis. After I brought the car to dealership, I waited for over a month and then received an email from Corporate Customer Service- there is nothing wrong with my car. So, I'm still driving a car, that can and will stop at any moment. I warned Porsche corporate that if the next time my car stops for no apparent reason and this leads to an injury or worse, someone at Porsche will be charged with manslaughter. Even though Porsche Corporate knows that these cars are a problem, the company refuses to address this issue and blatantly lies to clients, hoping that no one wants to take on a big corporation. How long will it be, until there is a serious injury or worse happens due to these sudden stops? I have all the communication between myself,orsche corporate and Porsche North Seattle showing the exact dates, when these issues happened, the attempt to fix them, the text message from dealership telling me that there is a transmission issue and lastly the email from Corporate, stating that there are no issues with this car. Please take a look. Thank you.

Source: NHTSA complaint ODI #11725896 · view all complaints for this vehicle at nhtsa.gov

The vehicle’s battery module became defective and would not accept or hold a charge. When attempting to charge the vehicle using standard charging equipment, the battery system repeatedly failed to initiate or complete the charging cycle. The vehicle displayed charging error messages and/or failed to respond when connected to a charging source. Despite using properly functioning charging equipment and verified power sources, the battery module would not charge. The issue was diagnosed as a defective battery module. As a result, the vehicle became inoperable due to the inability to recharge the high-voltage battery. This defect created a safety concern because the vehicle could unexpectedly lose available driving range and become disabled without warning. The failure rendered the vehicle unusable until the battery module required repair or replacement.

Source: NHTSA complaint ODI #11721039 · view all complaints for this vehicle at nhtsa.gov

On September 5th I was driving my 2021 Taycan 4S on my way to the Gym at 4:15 am, at that time there hardly any traffic. As am merging on the 101 southbound at the nearest on ramp everything seemed ok, as am driving along at 60-65 mph, I came to a downhill and the car was gaining speed, I stepped on the brake pedal to slow it down and to my surprise the brake pedal went all the way down to the floor! I had no brakes and gaining speed, my first thought was if the brakes had failed I would either crash the car against the freeway sidewalks or try to find a place where I can crash without hurting other drivers, fortunately I kept on pressing the brake pedal and it built up some pressure to slow it down but not to stop it, I kept my cool, but I was shaking knowing that I had no brakes! after a few miles the car was slowing down and was able To get off the freeway and pulled into my gym’s parking lot that luckily has an uphill and it helped to slow it down to a complete stop. At this point there was no warnings or error on the dashboard until it came to a complete stop, the message read “PSM failure” and to visit the workshop, nothing about the brake failure that had just happened! And it was after 2 hours, the failure occurred at 4:15 am and that did not show up until 6:12 am. I went into my gym to calm myself down after this horrible experience and after an hour or so I went back to my car and that is when I saw the warning, after a while I called Porsche road assistance and left the car where it was because Porsche road assistance couldn’t send a tow truck quickly, I revived a call from the tow truck company at 9:00 am and met them at the location, I explained to the driver what had happened and as he drove the car out of the parking spot brake fluid started to spray,out of the driver side font caliper, and there was a poodle of brake fluid under the car.

Source: NHTSA complaint ODI #11617777 · view all complaints for this vehicle at nhtsa.gov

I was making a left hand turn into a shopping center today around 4:55pm and the collision indicator flashed on and jerked my car to a stop in the middle of the road. There were no cars in my immediate area so it should not have been triggered. It was incredibly dangerous as it left me in the middle of the road, mid-turn. I am unaware if this has been checked by my dealership but we have had other issues that they have claimed to check to no avail.

Source: NHTSA complaint ODI #11765099 · view all complaints for this vehicle at nhtsa.gov