GMC TSB #21NA275
2020 GMC Sierra 3500
Affected Component: WHEELS
- Summary
- This service bulletin provides repair information to correct customer concerns of Rear Wheel Lock Up, ABS Event, Loud Bang and a Flashing ?D? on Driver Information Center (DIC) when Lightly or Moderately Accelerating Forcing an 8-7 or 8-6 Downshift.