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June 2, 2021 Service bulletin

This service bulletin provides a procedure to correct a condition of a Service Emission System and/or...

Chevrolet technical service bulletin 21NA125 for 2020-2021 Chevrolet Silverado 1500, 2020-2021 GMC Sierra 1500 and 2020-2021 Chevrolet Silverado 2500 and others.

Bulletin number
21NA125
Component
Engine and engine cooling
Summary
This service bulletin provides a procedure to correct a condition of a Service Emission System and/or Service Engine Soon Lamp Illuminated on Driver Information Center (DIC), DTC P208B Set.

Owners of these vehicles have filed 1,399 complaints in the engine category.

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