Is your defective GMC Terrain actually a LEMON?

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GMC TSB #21NA289

2021 GMC Terrain

TSB Document:

MC-10207925-9999.pdf

Affected Component: ELECTRICAL SYSTEM:IGNITION:COIL:SPARK PLUGS

Summary: This technical bulletin provides a procedure to inspect the ceramic portion of the sparkplug for cracking and to replace if found the cause of the customers concern.

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Date Published: DEC 15, 2021
NHTSA TSB #: 10207925

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