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June 22, 2021 Service bulletin

This service bulletin provides a repair procedure to correct a customer concern of Coolant and/or Oil...

Chevrolet technical service bulletin 21NA147 for 2012-2020 Chevrolet Impala, 2010-2017 Chevrolet Equinox and 2019-2021 Chevrolet Blazer and others.

Bulletin number
21NA147
Component
Electrical system: ignition: coil: spark plugs
Summary
This service bulletin provides a repair procedure to correct a customer concern of Coolant and/or Oil Leak, Malfunction Indicator Lamp (MIL) Illuminated?.

Owners of these vehicles have filed 4,941 complaints in the electrical category.

Vehicles covered

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