Assist problems of the 2021 GMC Sierra 1500

Four problems related to assist have been reported for the 2021 GMC Sierra 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2021 GMC Sierra 1500 based on all problems reported for the 2021 Sierra 1500.

1 Assist problem

Failure Date: 08/05/2025

2021 GMC Sierra 1500 [xxx] miles 36,500. My childs seatbelt does not work and the lane keep assist does not work information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

2 Assist problem

Failure Date: 02/15/2025

El motor DE mi camioneta falló por completo empezó a hacerle unos ruidos muy fuertes dentro del motor con solo 80,000 millas ES del 2021 la compré el año pasado no llegó ni un año DE uso una camioneta que supuestamente era muy buenas estaba en el momento DE lo sucedido estaba con mi mujer y mi hijo en el auto regresábamos DE un restaurante acá en miami y la camioneta se paró DE pronto la camioneta fue inspeccionada por la garantía extendida la cual no asumió la reparación luego del problema si salieron luces amarillas y rojas en la pantalla DE mi camioneta.

3 Assist problem

Failure Date: 01/20/2021

The contact owns a 2021 GMC Sierra 1500. The contact stated while driving at undisclosed speeds, the lane departure assist warning failed to activate when the vehicle drifted out of the driving lane. The failure was intermittent. The cause of the failure was not yet determined. The vehicle was taken to the local dealer who was unable to identify the cause of the failure. The contact was informed that the vehicle operated as intended. The manufacturer was notified of the failure. The failure mileage was 100.

4 Assist problem

Failure Date: 12/24/2020

Brand new 2021 sierra at4. Keep lane assist hasn't worked since day one. Lane departure warning either. It's been to the dealer twice and still no solution. It won't turn on.


Other Lane Departure related problems of the 2021 GMC Sierra 1500



Sierra 1500 Service Bulletins
Sierra 1500 Safety Recalls
Sierra 1500 Defect Investigations