Trailer Lamps Number Of Intermittent Short Circuit Detections Exceeded Signal Cross Coupled
Table of contents
B388E GMC Possible Causes
- Faulty Trailer Interface Control Module
- Trailer Interface Control Module harness is open or shorted
- Trailer Interface Control Module circuit poor electrical connection
How do I fix code B388E 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.
Cost of diagnosing the B388E GMC code
The cost of diagnosing the B388E 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)
B388E GMC Description
The Trailer Interface Control Module is supplied with battery voltage as well as ignition voltage from the rear body fuse block and is permanently grounded. For lighting operation, the trailer interface control module receives serial data messages from the Body Control Module (BCM) indicating what lamps have been activated on the vehicle. The trailer interface control module responds by applying voltage to the appropriate control circuits for the requested lamps illuminating the lamps on the attached trailer.
For stop lamp operation, the Trailer Interface Control Module receives an input from the center high mount stop lamp control circuit. When the brakes are applied on the vehicle, the Trailer Interface Control Module receives the brake applied input from the center high mount stop lamp control circuit. The trailer interface control module responds by applying voltage to the trailer stop lamp control circuit illuminating the trailer stop lamps. The trailer interface control module also receives a serial data message from the BCM indicating that the vehicle brakes have been applied.