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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1087 (Lighting Systems) >> Diagnostic Information and Procedures >> DTC B2540 >> Conditions for Setting the DTC >> DTC B2540 05

DTC B2540 05

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

DTC B2540 05 will set when the BCM detects a short to voltage or an open/high resistance in the rear fog lamp relay control circuit.

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