2020 GMC SIERRA 1500 Complaints

On 01/07/2025 I got in my truck to take it to GMC for an oil change and 75,000 mile service. When I began to drive I noticed I could barely turn the truck at all. The power steering was not working. Then a warning popped up to have the power steering serviced. The GMC dealership is an hour from my house. The entire drive the power steering didn't work. I explained what was going on to the GMC dealership and when they went to look at the truck the power steering was working again. When I left the dealership the power steering was working. I stopped at a friends house for about an hour and when I went to leave the power steering was not working again. I ended up having to drive an hour again with no power steering and made an appointment with GMC to get the power steering looked at. Currently they haven't commented on the Power Steering function but rather that there is a gear needing to be replaced in the steering column. Upon looking online it shows "Several model years of GMC Sierra trucks have been subject to a recall for intermittent power steering issues related to electrical glitches within the EPS system." However, my truck seems to not be on this list of affected vehicles but there is no other explanation of why this is happening with my truck and GMC has not commented on why it is happening but it is extremely dangerous.

Motor seized at 52,000 miles.... replaced motor... at 72K miles, lifters and rods had to be replaced on the 2nd motor. Transmission also failure at 72K, being replaced.

On January 8th I was driving when my 2020 GMC Sierra 1500 Denali started to misfire as well as several warning lights blinking. I happen to be a couple miles from the dealership I purchased it at so I drove it straight there. A few days later I was notified it was the lifters that went bad and it would cost $5400 plus tax. This is disturbing since I have only had my truck for a little over 4 years with 68,000 miles on it. After researching the problem it appears that its a common issue and I notices a class action lawsuit for this reason. Since it's not recalled currently I'm stuck covering the invoice. Before the problem happened my truck was driving normal and no warning lights came on. This needs to be investigated so the consumer isn't stuck paying for something that is an obvious GM issue .

The contact owns a 2020 GMC Sierra 1500. The contact stated that while accelerating from a stop light, the rear wheels seized. There were no warning lights illuminated. The vehicle was diagnosed by a mobile mechanic with transmission failure. The vehicle was towed to the residence. The dealer was informed of the failure. The contact was informed by the dealer that the repair was not covered under warranty due to the mileage. The vehicle had not been taken to the dealer. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was 82,000. The VIN was not available.

The truck was dropped off on November 11th of last year due to a valve body failure, and I’ve been informed that repairs cannot be completed because the necessary parts are unavailable. I purchased the truck in late August of last year and am now stuck making payments on a vehicle I can’t even drive. When I approached the GMC dealer about trading it in or having them buy it back, they said trading it in was an option but couldn’t offer anywhere near what I paid. To make matters worse, they have no timeline for the repairs, and buying it back isn’t an option.

Driving down highway at 60 mph and truck shut off. had to try to get it over to the shoulder to off the travel lane. Dealer found wire harness chaffed at front left shock tower ECM bracket. Several wires damaged, repaired and cleared codes. This could have been much worse had I been in heavy traffic and needed to cross additional lanes of traffic to park in a safe area. I had no power steering and limited space to park the truck. I called to police to have a car dispatched to park behind me so the truck could be loaded on a tow vehicle to bring it to the dealer. This could have been worse had my wife been driving.

ADDITIONAL INFORMATION RE ODI 116346689: Tried to report to GM using 800-462-8782 provided by you. Agent would not accept ANY information that I tried to provide, including year/make /model and would not confirm or deny that the issue was known by them. Agent said that the dealer would report their inability to fix the issue directly to GM, and that I could not. I have no way of knowing if the dealer made this report to GM. Calling this number was an infuriating, complete waste of time.

I had Engine Failure in June 2024 with roughly 50,000 miles. I was getting on I75 North in Auburn Hills, MI, when I heard a loud pop. The vehicle began shaking violently with a loss of engine power warning displayed, loss of oil pressure displayed followed by 2 successive limp mode warning. The vehicle would not drive over 25 MPH. Luckily the next exit was only a mile down the road. I was able to drive on the shoulder of the Interstate to get off of the highway. When I parked the vehicle shortly after, I viewed oil spewed all over the engine bay and under the truck. I then waited 4 hours in 95+ heat for a tow truck. The engine was replaced by the dealer with no root cause identified or communicated to me. There were no warning prior to this failure. The vehicle has had over 13 warranty related issues including the DEF heater melting, CAC pump failure, Numerous Exhaust Leaks, NOX and EGR sensors failing, brake control module faults etc.

On [XXX], I was driving my truck on [XXX] through Phoenix, AZ. It was 5 days after I had purchased the vehicle and only had 250 miles on the odometer. I was in the left lane was traveling at approximately 75mph. Within the span of about 20 seconds, several lights on the dash annunciated and several messages including a message about a brake failure and steering assist failure and then the engine suddenly turned off. The steering seemed heavy and the brakes seemed less responsive. I was able to coast to a stop on the side of the road thanks to the help of a couple truckers who blocked traffic across multiple lanes. The truck was towed to the dealer and they told me the entire engine needed to be replaced. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The contact owns a 2020 GMC Sierra. The contact stated that while driving at speeds over 38 MPH, and the Lane Departure Warning System was activated the seat indicator did not vibrate or sound an alert as intended. The vehicle was taken to the dealer where the software was reset but the failure persisted. The manufacturer was not notified of the failure. The failure mileage was 47,000.