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November 1, 2018 Service bulletin

This bulletin provides a procedure to reprogram the ECM to correct a condition of MIL On, DTC P0420 Set.

Chevrolet technical service bulletin 18NA331 for 2013-2015 Chevrolet Trax and 2013-2015 Buick Encore.

Bulletin number
18NA331
Component
Electrical system: software
Summary
This bulletin provides a procedure to reprogram the ECM to correct a condition of MIL On, DTC P0420 Set.

Owners of these vehicles have filed 74 complaints in the electrical category.

Vehicles covered

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