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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 274 (Lighting System - DTC B3891 To DTC C0297 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC B3948 or B3949: Front Turn Signal Circuits >> 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 B3948 01 and B3948 04 

The BCM detects an open/high resistance in the left front turn signal control circuit.

DTC B3948 02 

The BCM detects a short to ground in the left front turn signal control circuit.

DTC B3949 01 and B3949 04 

The BCM detects an open/high resistance in the right front turn signal control circuit.

DTC B3949 02 

The BCM detects a short to ground in the right front turn signal control circuit.

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