Two problems related to warnings have been reported for the 2020 GMC Sierra 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2020 GMC Sierra 1500 based on all problems reported for the 2020 Sierra 1500.
1. Lane keeping assistantance: the green vehicle indicator on the dashboard will disappear and stay off while driving. When it is off, it is unsafe. 2. Parking collision warning: the front and back sensors will disappear and become nonfunctional while driving and parking. Sometimes they activate for no reason as well. 3. Both exterior mirrors: after starting the engine to drive off , both exterior mirrors will lower automatically from my setting. After the truck is started and driven off, they must be rest again.
Lifters failed in November 2023 and had repaired major engine damage including 4 cylinders, cam shaft, lifters, gaskets etc. After major repair work done. Truck is now doing same exact thing in January 2024. The dealership is stating they will not look at the vehicle unless I buy a new battery. I asked them to try a used battery to see if that makes a difference. And then if it is the battery I will replace. I was hung up on after the technician doug pedersen stated ill have a supervisor call you back.
| Warnings problems | |
| Sensing System Camera problems |