Table 1 shows nine common engine and engine cooling related problems of the 2020 GMC Sierra 1500. The number one most common problem is related to the engine and engine cooling (200 problems). The second most common problem is related to the gas recirculation valve (egr valve) (four problems).
My 2020 GMC Sierra 1500 denali with l87 6. 2l v8 suffered a catastrophic, silent seizure at 108,000 miles. Driving at highway speeds, warning light stating shift to neutral and press start, engine completely shut off and would not turn back on. Read details...
1. On 05/9/25, the exhaust emissions system malfunctioned, triggering diagnostic trouble code p2c7a (exhaust emissions system failure). This repair, the seventh attempt since June 2024, addressed the same recurring emissions issue previously involving replacements of components such as the nox Read details...
- the ground strap corroded and broke apart. Yes, I have the ground cable that failed, if needed for inspection. - yes!!! the truck's steering kept going in and out of manual steering and the engine reduced in speed allowed, and then the engine cut out on me completely - while I was in the middle Read details...