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October 1, 2017 Service bulletin

Diagnostic Tip for Malfunction Indicator Lamp (MIL) Illuminated

Chevrolet technical service bulletin 17-NA-219 for 2017-2018 Chevrolet Silverado 1500, 2017-2018 GMC Sierra 1500 and 2017-2018 Chevrolet Silverado 2500 and others.

Bulletin number
17-NA-219
Component
Electrical system: wiring
Summary
Diagnostic Tip for Malfunction Indicator Lamp (MIL) Illuminated - DTC P249D, P249E, U029D, U029E Set Some customers may comment that the MIL is illuminated. The technician may find one or more of the following DTCs set: • U029D • U029E • P249D • P249E Note: The graphic above depicts an example of a torn and missing seal. • Moisture intrusion past a damaged (1) seal located in the connector for the NOx sensor wiring harness. • Missing (2) seal located in the connector for the NOx sensor wiring harness. Correction If you encounter a vehicle with the above concern, perform normal diagnostics for the codes set. ⇒ If diagnostics lead to NOx sensor replacement, inspect the mating chassis electrical connector for corrosion. Clean and repair as necessary.

Owners of these vehicles have filed 638 complaints in the electrical category.

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