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January 8, 2025 Service bulletin

This service bulletin advises the technician of possible coolant entering the areas of the engine, either...

Chevrolet technical service bulletin 20-NA-166 for 2014-2025 Chevrolet Silverado 1500, 2015-2025 Chevrolet Tahoe and 2014-2025 GMC Sierra 1500 and others.

Bulletin number
20-NA-166
Component
Engine
Summary
This service bulletin advises the technician of possible coolant entering the areas of the engine, either through failed parts or defects in the castings, that may be the cause of the concerns related to the MIL or the engine running rough.

Owners of these vehicles have filed 7,958 complaints in the engine category.

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