GMC TSB #PIT5948A
2023 GMC Sierra 1500
Affected Component: TRAILER HITCHES
- Summary
- This Preliminary information communicates that when they connect a trailer to the truck that there is a Service Trailer Brake message displayed in the DIC. When checking for DTC's a C159C sym49 maybe set for the Trailer Brake Control Switch. GM Engineering is aware of the issue and working on a fix.