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GMC TSB #07-08-42-006R

2021 GMC Sierra 2500

TSB Document:

Affected Component: EXTERIOR LIGHTING

Summary
This service bulletin provides technicians with information on available BCM calibrations to restore bulb outage detection on vehicles produced by a second stage manufacturer (Upfitter), and/or turn signals flash fast after factory box removed.

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Date Published
FEB 14, 2023
NHTSA TSB #
10232137
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