Table 1 shows two common electrical system related problems of the 2020 GMC Sierra 3500. The number one most common problem is related to the electrical system (eight problems). The second most common problem is related to the car will not start (one problem).
| Problem Category | Number of Problems |
|---|---|
| Electrical System problems | |
| Car Will Not Start problems |
Vehicle will not start due to known gm issues. This failure left my family stranded in cold dark unsafe area once already. If we were in the flow of traffic or had to leave an area immediately we would have been unable too. Known gm issue, engine fault code p12a6 fault code. Read details...
Progressive pause starts when starting vehicle. After a few weeks of pause starting vehicle had no power at all. Towed it to dealer they replaced a bad battery. Pause start continued and after 4-5 weeks vehicle would not start. Couldn�t turn park break off. Read details...