Is your defective GMC Sierra 2500 actually a LEMON?

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GMC TSB #19NA136

2021 GMC Sierra 2500

TSB Document:

MC-10186069-9999.pdf

Affected Component: EQUIPMENT

Summary: This service bulletin provides a diagnostic procedure to aid in correcting a customer concern of a Howling, Whining/Whirring Noise, Shudder/Vibration and/or Grinding Noise While in 4HI, 4HI Auto and/or During Parking Lot Maneuvers in Auto Mode.

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Date Published: DEC 01, 2020
NHTSA TSB #: 10186069

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