My 2021 GMC Sierra burned to the ground in my driveway and exploded next to my house 5 minutes after I got out of it. Purchased at Blaise Alexander in Mansfield Pa

The review by drgonzo of his GMC Sierra sounded exactly like what we experienced with our 2021 Sierra SLT. It drove beautifully until we hit 8,000 miles when our lifters suddenly went out and needed replaced. Within weeks our transmission started to spontaneously downshift enough to jerk us forward. That was repaired then same thing happened several weeks later. Transmission replaced then same thing happened several weeks later. Special GM engineer sent in who recommended control module be replaced. DAYS later same sudden downshifting occurred even worse. Truck declared a lemon, GM to replace truck but we have to pay difference. Now we have the impossible task of finding a 2021 satin steel slt CC/short box so our $4000 camper shell (painted satin steel) will fit. I found ONE that is priced $6,000 more than what we paid but it may sell before GM finds us a “host” dealership willing to to do negotiating. Oh, and we will be dinged a usage fee for the 8,000 miles we put on truck.

The only thing more disappointing than this vehicle is the customer service at General Motors. I bought a brand-new GMC Sierra 1500 Elevation pickup with the 5.3L engine and have had issues with it from the beginning. On cold mornings the transmission slips when accelerating. Luckily that goes away once the truck warms up. At 8200 miles, lifters on the right side of the engine failed, taking out a push rod and rocker arm. I was informed by the dealership that this was a known issue at GM, but no recall had been issued. If the truck had less than 8000 miles on it, GM would have authorized them to replace the lifters on both sides of the engine. Because GM is cheap and does not do the right thing for their customers, the opposite side of the engine experienced the same failure at the 14,000-mile mark. Also, the alignment was never right on the truck from day one, and by the 12,000-mile mark the front tires had worn so unevenly that they wouldn't pass state inspection. GM refuses to pay for the alignment, or the tires, because I took it to a reputable tire shop rather than the dealership. I would advise anyone to avoid these trucks at all costs. Don't make the same mistake that I did. Be smart and avoid all GM products.