Used 2021 GMC Sierra 1500 Consumer Reviews
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2021 GMC Sierra Denali 1500 4 x 4
DKB, 01/25/2022
2021 GMC Sierra 1500 4dr Double Cab 4WD SB (4.3L 6cyl 6A)
6 of 6 people found this review helpful
My review cameras have ben out since October. Parts were ordered in early November. The dealership has offered little to no communication as well as GMC customer assistance. For their top of the line Sierra, no one at GMC seems to care about their customers after the sale.
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Lifters be damned
Never again GMC, 07/14/2022
2021 GMC Sierra 1500 SLT 4dr Crew Cab 4WD 6.6 ft. SB (5.3L 8cyl 10A)
6 of 6 people found this review helpful
2021 GMC Sierra 1500 SLT 5.3L V8 vehicle that had 6k miles when engine completely failed. Dealer said this was a known issue. I asked why it wasn’t recalled and the response was ‘its happening early and under warranty so you’re covered’. EXCEPT you as the consumer can’t determine when it will fail particularly if you’re traveling. Completely ridiculous approach to doing business. BUYER BEWARE.
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Not great
Eli , 03/04/2022
2021 GMC Sierra 1500 Denali 4dr Crew Cab 4WD 5.8 ft. SB (5.3L 8cyl 10A)
5 of 5 people found this review helpful
I have a 2020 Sierra 1500 Denali 6.2L. Love the looks, power, and gas mileage. That’s where it ends. The trucks been in the shop to have engine parts replaced, the infotainment system completely replaced, the cameras don’t match up anymore and I’m told there’s nothing that can be done…. And just today the volume completely stopped working. I’ll trade it in for a car and wait for the new Tundra to show up.
Terrible unreliable
Bryan, 01/25/2022
updated 02/28/2022
2021 GMC Sierra 1500 SLT 4dr Crew Cab 4WD 5.8 ft. SB (5.3L 8cyl 10A)
5 of 5 people found this review helpful
Purchased on December 30, 2021. So far the radio had to be replaced, the AC system has a leak, and now the engine has a problem with the lifters causing it to misfire on cylinder #2. DO NOT BUY THIS PIECE OF JUNK 2/26/22: I took delivery of my new 2021 GMC sierra on December 30, 2021. In August 2022, the infotainment system failed and had to be replaced. In December 2022, the A/C system developed a leak which the dealer said must be located within the dashboard because they could not find it within the engine compartment. The dealership placed a UV dye and recharged the AC and told me to return when the AC stops cooling and that they would remove the dashboard to attempt to find the leak. It has been winter time and I have not needed to use the AC, so my plan was to recharge right before going to trade this terrible truck in. In January 2022, the engine lifters failed. I had to wait 3 weeks for the parts to arrive and it took another 2 days for the lifters to be replaced. I picked the truck up on February 21, 2022 and planned on going the following weekend to trade this truck in. However, the lifters failed for the 2nd time on February 23 (2 days later). The truck was returned to the dealer because it is still under warrantee. GM's solution for lifters that have failed twice is to replace the lifters again. I don't understand how replacing defective lifters with new defective lifters will solve the problem. I will need to wait another 2 to 3 weeks for the parts to arrive plus another 2 to 3 days for the repair. I will not make the same mistake again. Immediately after picking the truck up this time, I will be driving directly to any dealer other than GM and trading this piece of junk in. It will be someone else's problem
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Piece of junk…GM should be ashamed
Nadir Attiah, 01/03/2023
2021 GMC Sierra 1500 SLT 4dr Crew Cab 5.8 ft. SB (5.3L 8cyl 8A)
4 of 4 people found this review helpful
At about 10000 miles failed engine, rt valve lifter problem. I asked them to do the left side before it fails, GM refused. At 25000 miles left lifter fails. Of course each one failing while I am in the road. For GM to know about the problem yet let people in safely drive their trucks exposing lives to danger is beyond unbelievable. Can’t wait to trade it in for something reliable. They need to learn from Toyota how to recall and fix issues as they rise. Shame on you GM
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