B3890 - Trailer Backup Lamps Circuit
B3890 Possible Causes
- Faulty Trailer Backup Lamps
- Trailer Backup Lamps harness is open or shorted
- Trailer Backup Lamps circuit poor electrical connection
- Faulty Trailer Lighting Control Module
How do I fix code B3890Check 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.
B3890 04 Trailer Backup Lamps Circuit Open
Cost of diagnosing the B3890 code
Labor: 1.0The cost of diagnosing the B3890 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)
B3890 DescriptionThe Trailer Lighting Control Module receives a serial data message from the Body Control Module (BCM) indicating that the vehicle backup lamps have been activated. The Trailer Lighting Control Module responds by applying battery voltage to the trailer backup lamp control circuit illuminating the trailer backup 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 backup lamps control circuit.
B3890 More InformationNeed more information on how to fix the B3890 code?
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