B3891 - Trailer Fog Lamps Circuit
B3891 Possible Causes
- Faulty Trailer Fog Lamps
- Trailer Fog Lamps harness is open or shorted
- Trailer Fog Lamps circuit poor electrical connection
- Faulty Trailer Lighting Control Module
How do I fix code B3891?Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
B3891 04 Trailer Fog Lamps Circuit Open
Cost of diagnosing the B3891 code
Labor: 1.0The cost of diagnosing the B3891 code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
- Engine Light ON (or Service Engine Soon Warning Light)
B3891 DescriptionThe Trailer Lighting Control Module receives a serial data message from the Body Control Module (BCM) indicating that the vehicle rear fog lamp have been activated. The Trailer Lighting Control Module responds by applying battery voltage to the trailer fog lamp control circuit illuminating the trailer fog lamps. The Diagnostic Trouble Code (DTC) sets when the Trailer Lighting Control Module detects a short to ground or an open/high resistance in the trailer fog lamps control circuit.
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