Driving the car it started backfiring and then the ESC light came on and the car engine seemed to become erratic as well as steering and braking error messages and the check engine started blinking. Very scary before I got it pulled over and very thankful I wasn-??t on the highway etc. I-??m seeing all the issues online sounds like the supposed fixes for the 2019 models having issues aren-??t solving the problem. I bought mine in April and 4 months later it-??s become unreliable.

- Georgetown, MA, USA

Brand new 2021 Sierra AT4. Keep lane assist hasn't worked since day one. Lane departure warning either. It's been to the dealer twice and still no solution. It won't turn

- Spokane, WA, USA

Started vehicle everything was normal shifted vehicle into drive proceeded forward. While driving vehicles steering seized I was unable two move the steering wheel. It was also very difficult to stop the vehicle brakes were not working properly. Messages came up on to display reading service power steering and briefly imessage about the brakes flashed quickly on the message board. At that point turn the vehicle off after I got it stopped turn it back on same message still unable to turn the steering wheel repeated this several times approximately for fourth time the message cleared and the vehicle was back to normal. This occurred on a city street.

- Tucson, AZ, USA