2020 GMC Sierra 1500 Recalls, Ratings & Complaints

Incident: September 19, 2026 · Filed: October 28, 2026

6.2 liter engine failed at 59,300 miles. Being replaced right now with remanufactured engine. 2020 GMC Sierra is not part of recall but others have had problems as well

Incident: October 1, 2026 · Filed: October 23, 2026

I own a 2020 GMC sierra AT4. It has developed a shudder when cruising on the highway or driving in town around 1500rpm. I believe it is coming from the transmission. A local shop mentioned the torque converter. The shudder feels like a delay in power and makes it difficult to hold speed or accelerate when needed.

Incident: October 23, 2026 · Filed: October 23, 2026

This morning it seems as if my 6.2L GM motor threw a rod. All the initial sounds and check engine information point toward that. I will be taking it to a dealer to confirm the issue. Data center driving ability and sounds indicate steering was affected as well or is somehow connected.

Incident: October 19, 2026 · Filed: October 21, 2026

Transmission control valve real,rear wheels can lock up causing accident recall # 26V083000

Incident: October 2, 2026 · Filed: October 19, 2026

I was driving and my truck shut down on me while I was driving down the road, I had to get it towed to the dealership where it was confirmed that the motor would need to be replaced. There was no warning, it just turned off and luckily I was able to coast to a safe area to wait for the tow truck.

Incident: October 15, 2026 · Filed: October 17, 2026

[XXX] General Motors Company P.O. Box 33170 Detroit, MI 48232-5170 c/o Franklin, Customer Support Re: Formal Demand for Buyback – 2020 GMC Sierra AT4 Black Widow VIN: [XXX] | 6.2L Engine Recall ~ 25V-274. Plus ~ GM 10-Speed Transmission, Multiple Recalls Dear GMC Legal, I am providing written notice as required by 15 U.S.C. §2310 and New York State Lemon Law. This vehicle substantially impairs the safety, use, and value of my truck, and I am requesting a full buyback. The Facts: On [XXX], the vehicle was taken out of service and remained at the shop for 11 weeks. It was returned with yellow marking paint splattered on the exterior, floor mats, and brake pedal. On [XXX] — with fewer than 400 miles on the replacement engine — the engine and/or transmission suddenly shut off at 55 mph on [XXX]. It restarted with a violent boom, then cycled between shutting off and restarting with loud clacking and shaking for the remainder of the drive. I was forced to drive at 25 mph with hazard lights to reach home. The Legal Basis: This is a safety defect on a vehicle subject to Recall 25V-274. GM was on notice of this known, concealed defect. The vehicle has been out of service for 30+ cumulative days. I have been denied a reasonable opportunity to cure. The vehicle has caused me severe and ongoing psychological distress, imminent and uncontrolled danger to my life, and total and continuing loss of use for its fundamental purpose. My Demand: 1.Full buyback under New York State Lemon Law — full purchase price, loan payoff, taxes, registration, and all incidental and consequential damages. 2.$5,000 additional compensation for the safety hazard and loss of use. 3.Attorney's fees and costs under 15 U.S.C. §2310(d)(2). I reserve all rights under the Magnuson-Moss Warranty Act, New York State Lemon Law, and all applicable consumer protection statutes. Please respond in writing within 10 business days. If unresolved, I will join the c INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Incident: September 16, 2026 · Filed: October 15, 2026

Driving down road started to hear a weird growling knocking sound and noticed a reduction of power. also noticed lower then normal oil pressure. Changed oil found metal shavings in the oil. sent to chevy dealership. Diagnosed "rod bearing failure" needs new engine.

Incident: October 10, 2026 · Filed: October 14, 2026

The contact owns a 2020 GMC Sierra 1500. The contact noticed an abnormal odor inside the vehicle. Upon inspection, the contact observed that the roof, rear seats, and rear carpet were saturated with water. The vehicle was taken to the dealer, where the contact was informed that the rear sliding window frame connected to the roof was fractured, causing water to leak into the vehicle. The contact was informed that the failure was a factory defect associated with an unknown recall; however, the VIN was not included. The manufacturer was notified of the failure by phone and referred the contact to the dealer. The contact was advised that the repair was not covered because the VIN was not included in the recall. The failure mileage was approximately 90,320.

Incident: September 29, 2026 · Filed: October 13, 2026

The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle suddenly entered Limp mode without warning. The vehicle was taken to the dealer, where the computer was reflashed and the vehicle temporarily returned to normal operation; however, the failure recurred and the vehicle was returned to the dealer. The contact noticed a burnt odor coming from the engine compartment, along with engine bay cooling fans running at an unusual rate. Upon further inspection, the dealer diagnosed the failure as a defective coolant valve. The contact associated the failure with GM Special Coverage TSB N252508341; however, the VIN was not included in the coverage program. The manufacturer was notified of the failure. The failure mileage was 107,000.

Incident: August 6, 2026 · Filed: October 8, 2026

I have a 2020 GMC Sierra 1500 AT4 with the L87 6.2L V8. The cam shaft and lifters have failed for a 2nd time. The first time happened in 2022. It was under warranty and happened at approximately 40,000 miles. This last time it happened in 2026 and was at 125,000 miles - both for the same thing - cam shaft and lifters. Both were sudden failures and luckily I was on a highway that wasn't buy at the time. This time it is costing me $10,000 to fix. They have had the truck for two months now. My understanding is the significant recall that occurred was being investigated to see if it should be expanded. I believe it should have been expanded. Whatever came of that decision? GM told me they could offer no help as my truck was out of warranty and my truck was not on the recall list. I'm curious if it will be expanded and what would happen in my situation if it is expanded. GM has deleted the support message chain that went on for four weeks where I was trying to get them to cover it under the recall and/or explaining the entire situation. Thanks, [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)