NHTSA Complaint #11427721 — 2017 CHEVROLET VOLT

I have owned the 2017 Volt since August of 2017. Late 2018 or early 2019 I started having an intermittent problem when I turned the car off. The screen showed an error message "Action required - Shift to park". The car was in park already. I would push the start button. Shift into gear and shift again into park. In the beginning that solved the problem. But the car did not fully shut down when the error message is displayed. If the door is opened, the signal that the engine is running beeps. I took it to the dealer service department . They kept the car for a day to diagnose the problem but did not get the error message. But as the problem was intermittent, it continued. I returned the car to the dealer and they said they made an adjustment that should resolve the problem. It didn't. The problem became constant and I could not shift into park. The car did not fully shut off and I couldn't lock it. I returned the car to the dealer and it was there for several days while they waited for a new shifter. It was on their EV charger full time so as to not drain the battery. The shifter was replaced in February 2019. I thought this was a random incident but found out it is not. In July 2021 the same problem returned. I called 2 dealers for an appointment and have to wait 3 weeks for an appointment. I looked online for solutions and to see if others had the same experience. I found many postings and comments with screenshots of the same error message and cars not turning off. It seems to be a defect affecting the Volt and other GM cars of the same age. I had an appointment at lunch 8/3/21 and after several tries to engage the parking gear, the car still would not turn off. I had to leave it running in the parking lot for 30 minutes and it would not lock. The car shut off normally when I returned to the office. This is not an issue of safety on the road, but the inability to turn off the car and lock it is a safety factor, especially for women.