Most common 2026 GMC Sierra 1500 problems
Share of the 143 complaints; one complaint can involve more than one system. "~" is the median mileage when the problem started.
GMC Sierra 1500 complaints by model year
Best Sierra 1500 years: 2012, 2013. Years to avoid: 2024, 2023, 2022, 2021, 2019. Compare all years →
2026 GMC Sierra 1500 recalls (2)
Power train › Transfer case (4-wheel drive)
General Motors, LLC (GM) is recalling certain 2026 Cadillac Escalade and Escalade ESV, Chevrolet Silverado 1500, Suburban, and Tahoe, and GMC Sierra 1500, Yukon, and Yukon XL vehicles with four-wheel (4WD) or all-wheel drive (AWD), and certain 2015-2020 Suburban, Escalade, Escalade ESV, Yukon, Yukon XL, and Tahoe vehicles.
Remedy: Owners are advised not to drive their vehicle until the remedy is completed. Dealers will inspect and, if necessary, replace the transfer case assembly, free of charge.
Equipment › Other › Owners/service/other manual
General Motors has decided that certain 2027 Chevrolet Bolt EV, 2025-2026 Cadillac OPTIQ, Chevrolet Colorado, Equinox EV, GMC Canyon, 2026 Buick Enclave, Envision, Cadillac CT5, Escalade, Escalade ESV, Escalade IQ, Escalade IQL, LYRIQ, VISTIQ, Chevrolet Blazer EV, Corvette Convertible, Corvette Coupe, Corvette Convertible…
Remedy: Dealers will reset the vehicle radio, which will facilitate automatic download of the electronic owner's manual, free of charge. Owner notification letters were mailed April 16, 2026.
NHTSA defect investigations
Federal safety investigators have looked into a possible defect involving the 2026 GMC Sierra 1500:
Loss of motive power due to engine failure post recall remedy
On January 16, 2026, the Office of Defects Investigation (ODI) opened Recall Query RQ26001. This investigation was opened to assess the remedy effectiveness of Recall 25V-274. ODI has received complaints alleging engine failure in vehicles after the recall remedy had been completed, whether that remedy involved an oil viscosity change or a complete engine replacement.
What 2026 GMC Sierra 1500 owners say
Engine & cooling all 98 →
5/08/2026: I stopped outside my garage. I then placed the truck in park and exited the vehicle while running. I went inside my garage and several minutes later, heard a crash. The truck had driven forward while unattended, and crashed into the corner of my garage, causing damage to both the building and the truck. Truck indicated it was still in park upon reentry. 5/11/2026 In a separate incident 3 days later, while driving at approximately 50mph, truck engaged in an automatic braking event with no discernible cause. Simply applied what felt like 100% braking for a split second, then released. 5/12/2026: Truck taken to GMC for investigation. No codes in any modules detected. 9/20/2026: Vehicle reports transmission fault, states it should not be driven. 9/21/2026: Towed to GMC dealer. Found codes P17A8 and P189D and diagnostic code 6906361, internal fault within gearshift control module. …
The contact owns a 2026 GMC Sierra 1500. The contact stated that while at a stop light, the engine shut off to save fuel, but after releasing the brake pedal, the engine failed to restart. The contact shifted to park, and the engine restarted. The contact stated that the failure had occurred on several occasions after the fuel saving feature was deactivated. Additionally, the contact stated that the failure had occurred while slowing down and driving over a railroad track and hauling a trailer. The vehicle was taken to the local dealer on several occasions, but the failure was not duplicated. The manufacturer was notified of the failure. The failure mileage was 4,300.
Transmission & drivetrain all 34 →
5/08/2026: I stopped outside my garage. I then placed the truck in park and exited the vehicle while running. I went inside my garage and several minutes later, heard a crash. The truck had driven forward while unattended, and crashed into the corner of my garage, causing damage to both the building and the truck. Truck indicated it was still in park upon reentry. 5/11/2026 In a separate incident 3 days later, while driving at approximately 50mph, truck engaged in an automatic braking event with no discernible cause. Simply applied what felt like 100% braking for a split second, then released. 5/12/2026: Truck taken to GMC for investigation. No codes in any modules detected. 9/20/2026: Vehicle reports transmission fault, states it should not be driven. 9/21/2026: Towed to GMC dealer. Found codes P17A8 and P189D and diagnostic code 6906361, internal fault within gearshift control module. …
The contact owns a 2026 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the transmission independently shifted to park or neutral. The contact stated that the failure had occurred while driving at slow speeds. The contact stated that during one failure, the brakes independently activated, and the vehicle shut off. The contact stated that while attempting to restart the vehicle, the vehicle started. The contact stated that the failure was persistent. The dealer was made aware of the failure by phone. The vehicle was taken to the dealer; however, the diagnostic result was not provided. The failure mileage was approximately 500.
Electrical system
The contact owns a 2026 GMC Sierra 1500. The contact stated that upon starting the vehicle and shifting into reverse(R), the vehicle failed to move while depressing the accelerator pedal. The contact felt a hesitation while depressing the brake and accelerator pedals, and the contact then attempted to restart the vehicle. The contact restarted the vehicl;e however, while attempting to accelerate, the brakes independently activated. Despite the repeated failure, the contact was able to pull into a gas station to restart the vehicle. The contact stated that after several attempts, the vehicle finally resumed normal operation, and the contact drove the vehicle to the residence. The next day, the contact test drove the vehicle, and the failure reoccurred while the contact was attempting to park the vehicle in a parking spot. …
5/08/2026: I stopped outside my garage. I then placed the truck in park and exited the vehicle while running. I went inside my garage and several minutes later, heard a crash. The truck had driven forward while unattended, and crashed into the corner of my garage, causing damage to both the building and the truck. Truck indicated it was still in park upon reentry. 5/11/2026 In a separate incident 3 days later, while driving at approximately 50mph, truck engaged in an automatic braking event with no discernible cause. Simply applied what felt like 100% braking for a split second, then released. 5/12/2026: Truck taken to GMC for investigation. No codes in any modules detected. 9/20/2026: Vehicle reports transmission fault, states it should not be driven. 9/21/2026: Towed to GMC dealer. Found codes P17A8 and P189D and diagnostic code 6906361, internal fault within gearshift control module. …
2026 GMC Sierra 1500 engines & fuel economy
| Engine | Transmission | Drive | MPG city / hwy / combined | Range |
|---|---|---|---|---|
| Electric | Single-speed | 4WD | 75 / 61 / 68 MPGe | 410 mi |
| 3.0L 6-cyl turbo diesel | 10-speed automatic | RWD | 23 / 28 / 25 | — |
| 3.0L 6-cyl turbo diesel | 10-speed automatic | 4WD | 22 / 26 / 24 | — |
| 2.7L 4-cyl turbo | 8-speed automatic | RWD | 18 / 21 / 20 | — |
| 5.3L 8-cyl | 10-speed automatic | RWD | 16 / 21 / 18 | — |
| 2.7L 4-cyl turbo | 8-speed automatic | 4WD | 17 / 20 / 18 | — |
| 5.3L 8-cyl | 10-speed automatic | 4WD | 15 / 19 / 17 | — |
| 6.2L 8-cyl | 10-speed automatic | 4WD | 15 / 19 / 16 | — |
EPA ratings. Class: Full-size pickup.
Frequently asked questions
Is the 2026 GMC Sierra 1500 a good car?
Based on 143 owner complaints filed with NHTSA, the 2026 Sierra 1500 rates avoid: 14.3× as many complaints as a typical year of the Sierra 1500 at the same age. Complaint counts don't account for sales volume or individual maintenance, so have any used car inspected before buying.
What is the most common problem with the 2026 GMC Sierra 1500?
The engine & cooling — 98 complaints, 69% of all complaints for this model year. Next are the transmission & drivetrain (34) and electrical system (17).
How many recalls does the 2026 GMC Sierra 1500 have?
There are 2 recalls for the 2026 GMC Sierra 1500, the most recent from May 7, 2026 (transfer case (4-wheel drive)). Recall repairs are free at any authorized dealer — check whether yours has been done with the VIN recall check.
What are the best and worst years of the GMC Sierra 1500?
The best years by complaints, compared at the same age, are 2012 and 2013. Years to avoid or approach with caution: 2024, 2023, 2022, 2021 and 2019. See the full GMC Sierra 1500 years comparison.
At what mileage do 2026 GMC Sierra 1500 problems happen?
The median mileage reported in complaints is about 4,000 miles; 100% of problems with a recorded mileage started before 50,000 miles.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.