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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 271 (Lighting System - DTC B0655 To DTC B3890) >> Diagnostic Information and Procedures >> DTC B3890: Trailer Backup Lamps >> Conditions for Setting the DTC

Conditions for Setting the DTC

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

DTC B3890 02 

The trailer lighting control module detects a short to ground in the trailer backup lamps control circuit.

DTC B3890 04 

The trailer lighting control module detects an open/high resistance in the trailer backup lamps control circuit.

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