B3887 - Trailer Left Turn Signal Circuit

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3    What is this?
Table of contents

B3887 Possible Causes

  • Faulty Trailer Left Turn Signal
  • Trailer Left Turn Signal harness is open or shorted
  • Trailer Left Turn Signal circuit poor electrical connection
  • Faulty Trailer Lighting Control Module

How do I fix code B3887

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

B3887 02 Trailer Left Turn Signal Circuit Short to Ground
B3887 04 Trailer Left Turn Signal Circuit Open

Cost of diagnosing the B3887 code

Labor: 1.0

The cost of diagnosing the B3887 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)

B3887 Description

The Trailer Lighting Control Module receives a serial data message from the Body Control Module (BCM) indicating that the vehicle left or right turn signal lamp has been activated. The Trailer Lighting Control Module responds by applying a pulsating voltage to the appropriate trailer turn signal lamp through their respective control circuit illuminating the desired trailer turn signal lamp. 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 turn signal control circuit.
OBDII Code B3887 - Trailer Left Turn Signal Circuit - AutoCodes.com

B3887 More Information

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