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March 16, 2023 Service bulletin

This service bulletin explains how to identify possible DEF system contamination.

Chevrolet technical service bulletin 19-NA-237 for 2011-2018, 2020-2023 Chevrolet Silverado 1500, 2021-2023 Chevrolet Tahoe and 2018-2019, 2022 Chevrolet Equinox and others.

Bulletin number
19-NA-237
Component
Engine and engine cooling
Summary
This service bulletin explains how to identify possible DEF system contamination.

Owners of these vehicles have filed 6,687 complaints in the engine category.

Vehicles covered

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