general problems of the 2020 GMC Sierra 1500 - part 2

When stationary and preparing to start vehicle intermittently see "service steering column lock" message appears and disappear once vehicle is started. This was previously supposed to be addressed with service bulletin 20-na-21 however being told by service department that vehicle has all current updates applied a year ago, including the one that should of addressed the issue. Told that the vehicle history shows records of past "loss of communication to dic" but as they can't immediately reproduce no action was taken.

Dangerous visibility hazard when backing up vehicle at night. Infotainment screen switches to "full brightness" when backup camera is activated, resulting in blinding light to driver. Driver can not backup safely without physically covering the screen to regain visibility. Screen brightness reflects off all 4 windows, windshield and back glass. Side mirrors are unusable in this condition. There was a fix for this issue on previous gm models, (prior to 2018), however no fix for 2019 - present.

Rear window (the one that faces straight back towards bed of truck) is leaking… haven’t taken it in to dealership for repair because I’ve exceeded mileage so truck is no longer under warranty… not sure how long it’s been leaking but I’ve recently noticed that water stains (runs) on the inside of this window after rains, washes, etc….

After vehicle sits idle for a while, the vehicle makes a high pitch whistling sound on startup that last for approximately minute of driving.

Navigation states to turn right when it should be left or vice versa. This was a problem on the 2016-2017 models also.

Can not see anything backing up in the dark because of backup camera. The picture on the screen is grainy and washed out so all you see are blobs of nothing.

The backup camera is entirely too bright at night. It is nearly impossible to see the mirrors due to the brightness.