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 (176 problems). The second most common problem is related to the gas recirculation valve (egr valve) (four problems).
To the best of my knowledge… my 2020 GMC sierra denali with a 6. 2l engine and 74,000 miles had a complete engine replacement. One lifter on bank 2 was stuck, and the push rod in the cylinder was bent. The engine made a popping noise when starting. 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...
Tick sound coming from underneath. Also fumes smell. Dealership found it to be the exhaust system. Said the muffler valve is bad. Quoted me $2000 for repair. Never heard of a exhaust system failure in only 5 years. Very unsatisfied with this. Read details...