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GMC TSB #N222372592
2021 GMC Sierra 1500
TSB Document:
Affected Component: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)
- Summary
- Service Update. Certain vehicles may have a condition in which ice or sludge can accumulate in the Charge Air Cooler (CAC) or Closed Crankcase Ventilation (CCV) system when driving in extremely cold weather conditions (-18°C (0°F) or less). Dealers will install a radiator air front lower baffle and, if necessary, reprogram the Engine Control Module.
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