One problem related to wiring has been reported for the 2015 GMC Sierra. The most recently reported issues are listed below.
Vehicle started showing "service lane departure system, service park assist, service trailer brake system" alarms while driving. Upon taking it to the dealer for service it was found to have broken wiring for haptic motor for drivers seat. Not only did this cause a possible safety issue with the lane departure system and trailer brake system not working correctly, but it also caused a possible fire concern due to broken wiring.
| Electrical System problems | |
| Wiring problems |