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We found the following complaints for GMC SIERRA DENALI (2020)

Read complaints for GMC SIERRA DENALI (2020)


I noticed several spots of oil on my driveway, i then inspectedthe underside of the engine (l5p) and noticed oil dripping from several bolts and lines. My vehicle, a 2020 2500hd denali diesel, has only 2,200 miles on it from normal highway driving.

Knocking coming from engine - noticeable unnecessary noise in which dealer can not fix the problem

Two issues broken valve springcaused engine to shut down, second service brake, brake failure light, service esc, service trailer brake messages causing brake failure

Brakes squeak.started about 3000 miles. I have complained to dealer several times.

Two issues broken valve springcaused engine to shut down, second service brake, brake failure light, service esc, service trailer brake messages causing brake failure




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