Is your defective GMC Sierra 1500 actually a LEMON?

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GMC TSB #21NA002

2021 GMC Sierra 1500

TSB Document:

MC-10187767-9999.pdf

Affected Component: EQUIPMENT:ELECTRICAL:ENGINE BLOCK HEATER

Summary: This informational bulletin provides a test procedure, for a possible faulty DEF Heater.

Click a tab for more information.

Date Published: JAN 13, 2021
NHTSA TSB #: 10187767

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