B3888 - Trailer Right Turn Signal Circuit

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

B3888 Possible Causes

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

How do I fix code B3888

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

B3888 02 Trailer Right Turn Signal Circuit Short to Ground
B3888 04 Trailer Right Turn Signal Circuit Open

Cost of diagnosing the B3888 code

Labor: 1.0

The cost of diagnosing the B3888 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)

B3888 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 right trailer turn signal control circuit.
OBDII Code B3888 - Trailer Right Turn Signal Circuit - AutoCodes.com

B3888 More Information

Need more information on how to fix the B3888 code?
Get Access to Factory Service Manuals

Information for specific makes

Need more help?

Get the B3888 code diagnosed by a professional: Find a repair shop in your area


Help us improve AutoCodes.com. Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the B3888 code? Have you replaced any parts?
Any information is appreciated. Thanks
Top ⇧