2021 GMC Sierra 1500 locks problems

Filed Sep 16, 2026 · Locks · 66,000 miles · MN

The contact owns a 2021 GMC Sierra 1500. The contact stated that while driving at various speeds, the tailgate opened independently. The failure occurred several times and became more persistent recently. The contact stated that while the vehicle was parked in the driveway, the side marker lights started flashing, and the tailgate opened. Additionally, upon exiting a store, the contact discovered that the tailgate had opened while the vehicle was parked. The dealer and the manufacturer were notified of the failure and confirmed that the VIN was not included in a recall. The failure mileage was approximately 66,000.

Filed Dec 22, 2025 · Locks · 30,000 miles · WI

The contact owns a 2021 GMC Sierra 1500. The contact stated that after the vehicle was taken to a local car wash, upon further inspection, the tailgate door had independently unlatched and was open. No warning light was illuminated. In addition, the contact stated that while driving at an undisclosed speed, the local Police Department called about luggage found on the side of the road. Upon further inspection, the contact noticed that the tailgate had independently unlatched and was open. The vehicle was previously taken to a local dealer, where the vehicle was repaired under warranty. The vehicle was taken back to the same local dealer where it was repaired for a tailgate switch failure at the owner's expense. The manufacturer was made aware of the failure. The failure mileage was approximately 30,000.

Filed Aug 18, 2025 · Locks · 90,300 miles · UT

The contact owns a 2021 GMC Sierra 1500. The contact stated that while the vehicle was parked, the tailgate opened independently. No warning lights were illuminated. The contact stated that on a separate occasion, while the vehicle was parked at the residence, the contact approached the vehicle and the tailgate attempted to open independently. The contact moved the vehicle and turned off the engine. The tailgate attempted to open independently again. The contact moved the key fob away from the vehicle to prevent the tailgate from opening. No warning lights were illuminated. Most recently, the vehicle was parked at the residence in front of a toolbox, when the tailgate opened independently and dented the tailgate. The contact called the dealer; however, the vehicle was not diagnosed or repaired. Upon further investigation, the contact related the failure to Manufacturer Recall Number: N232426400. The manufacturer was not notified of the failure. The failure mileage was approximately 90,300.

Filed May 19, 2025 · Locks · 20,000 miles · FL

The contact owns a 2021 GMC Sierra 1500. The contact stated that the rear tailgate panel buttons had deteriorated causing water intrusion into the panel, and the buttons became inoperable when pressed, and the rear tailgate would not open. The vehicle was taken to the local dealer who replaced the rear tailgate panel, and the vehicle was repaired. The manufacturer was notified of the failure, but no assistance was offered. The failure mileage was 20,000.

Filed Apr 4, 2025 · Electrical, Locks · 63,315 miles · CA

The contact owns a 2021 GMC Sierra 1500. The contact stated while the vehicle was parked, the contact attempted to turn off the vehicle; however, the vehicle remained running. A message was displayed to shift to park(P). The contact stated that the lights, radio, and other functions remained operational. On another occasion, the vehicle jerked, and the steering was difficult to turn. The dealer was contacted; however, the vehicle had not been taken to be diagnosed or repaired. The contact also stated that the trunk failed to fully close. The message that the trunk was open was displayed. The contact attempted to close the trunk and message on the displayed was turned off; however, the trunk remained slightly open. The vehicle was not taken to be diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 63,315.

Filed Feb 28, 2025 · Locks · 76,000 miles · IN

The contact owns a 2021 GMC Sierra 1500. The contact stated that the tailgate opened unintendedly while driving, and while the vehicle was parked. The contact stated that the failure had been recurring. The vehicle was taken to the dealer but was not diagnosed or repaired. The contact related the failure to GM Campaign Number: N232426400. The manufacturer was notified of the failure and referred the contact to the federal safety agency Hotline to report the failure. The failure mileage was approximately 76,000.

Filed Dec 27, 2024 · Electrical, Locks · 57,000 miles · OH

The contact owns a 2021 GMC Sierra 1500. The contact stated while driving at various speeds, the tailgate opened unintendedly. No warning light was illuminated. The vehicle was taken to the dealer but was not diagnosed or repaired. The dealer informed the contact that the VIN was not included in GM Campaign Number: N232426401. The manufacturer was not notified of the failure. The failure mileage was approximately 57,000.

Filed Dec 18, 2024 · Locks · 41,000 miles · IN

The contact owns a 2021 GMC Sierra 1500. The contact stated while driving 40 MPH, the message that the tailgate was opened was displayed, and the contact became aware that the tailgate had opened. The contact pulled over to the right side of the road to close the tailgate. The vehicle was not taken to an independent mechanic or dealer to be diagnosed or repaired. The contact stated that the VIN was not included in the federal safety agency Campaign Number: 24V060000 (LATCHES/LOCKS/LINKAGES). The manufacturer was notified of the failure and opened a case and referred the contact to the federal safety agency Hotline to report the failure. The failure mileage was 41,000.

Filed Jul 16, 2024 · Locks · 58,000 miles · ME

The contact owns a 2021 GMC Sierra 1500. The contact stated while the vehicle was parked and turned off, the electronic rear tailgate door erroneously unlatched and opened. The contact stated that the failure had occurred on several occasions. The cause of the failure was not yet determined. The local dealer and manufacturer were notified of the failure. The failure mileage was 58,000.

Filed Jun 20, 2024 · Body, Locks · 45,000 miles · MI

The contact owns a 2021 GMC Sierra 1500. The contact stated that the inner tailgate door failed to open while pressing the release button. On several occasions while pressing the release button, the inner door would lower down. The cause of the failure was not yet determined. The manufacturer and local dealer were notified of the failure, but no assistance was provided. The failure mileage was 45,000.