One problem related to warnings has been reported for the 2018 GMC Sierra 2500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2018 GMC Sierra 2500 based on all problems reported for the 2018 Sierra 2500.
While braking ( after being on the highway) all dash gauges turn black, radio shuts off, ac shuts off. Service stabilitrak light comes on when dash flashes back on. While driving ac turns off, radio turns off same stabilitrak warning flashes, speedometer turns off. Power steer control went out while trying to turn. Truck put itself in 4 wheel drive when I turned on the trailer assist. Parking assist periodically turns itself off.