What 69 owners told NHTSA about the 2021 Porsche Taycan 4s With Performance Pack

Driving at night at ~72 mph on a 65 mph divided highway with no traffic nearby the Collision Warning message appeared on the dash and the car noticeably slowed perhaps 5-10 mph. Then the msg cleared itself and the trip was completed otherwise uneventfully.

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The Taycan offers what Porsche calls Porsche Innodrive (PID). PID once activated, the car uses navigation information and road signs to automatically adjust the vehicle's speed to the speed limit of the road. In some instances, the system speed freezes at, e.g., 50 mph and no longer adjusts to the speed limit of the road. When this happens, the vehicle will accelerate to the speed it froze at. I have experienced this multiple times. See attached image. The car indicates that it would accelerate to 50 mph in a 25 mph zone. This has happened multiple times, with speeds frozen at 65 mph.

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On August 28, 2021, I was on I-75 in light traffic going about 70 MPH when a red alert on my screen appeared that said, “COLLISION WARNING.” It remained illuminated for about 3 seconds, then disappeared. It startled me because I didn’t know what evasive action to take. There were no vehicles even close to me. I also continue to receive "Driver Attention Required" warnings from time to time. My dealer told me that can happen if I don't have both hands on the wheel. In all instances, I had both hands tightly on the wheel. I sent an email to my dealer's manager with a request that he document this with Porsche corporate and that I receive a written response that includes the number of owners reporting a similar event to Porsche, Porsche's attempts to ascertain a cause, Porsche’s determination of the probable cause and Porche’s proposed remedy. He replied, "I’ve escalated your concerns to PCNA." They asked me to take my 2021 Taycan RWD in for them to download the event log for analysis. I did that. Hearing nothing back three weeks later, I followed up with another email to my dealer. I promptly received a phone call from the service manager saying that he was told by PCNA "that they reviewed the log, they have never seen or heard of the problem and that they don't know what may have caused it."

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I am getting a warning and sometimes unwanted braking. the warning is that driver must assume control but this happens when I have all the driver's assist features turned off. on a recent 1500 mile road trip this fault happened at least 10 times at highway speeds.

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