Trailer Left Tail Lamp Circuit
Table of contents
B3885 GMC Possible Causes
- Faulty Trailer Left Tail Lamp
- Trailer Left Tail Lamp harness is open or shorted
- Trailer Left Tail Lamp circuit poor electrical connection
- Faulty Trailer Lighting Control Module
How do I fix code B3885 GMC?
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.
Tech Notes
- B3885 02 Trailer Left Tail Lamp Circuit Short to Ground
- B3885 04 Trailer Left Tail Lamp Circuit Open
Cost of diagnosing the B3885 GMC code
The cost of diagnosing the B3885 GMC 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.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B3885 GMC Description
The Trailer Lighting Control Module receives a serial data message from the Body Control Module (BCM) indicating that the vehicle park lamps have been activated. The Trailer Lighting Control Module responds by applying battery voltage to the left and right trailer tail lamp control circuits illuminating the trailer tail 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 left trailer tail lamp control circuit.