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TSB Document:

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.

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Date Published
SEP 27, 2022
NHTSA TSB #
10224300
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