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GMC TSB #PIT5948

2022 GMC Sierra 1500

Summary: This Preliminary information communicates thatÂ when they connect a trailer to the truck that there is a Service Trailer Brake message displayed in the DIC.Â When checking for DTC's a C159C sym49 maybe set for theÂ Trailer Brake Control Switch.Â GM Engineering is aware of the issue and working on a fix.

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