B3889 - Trailer Brake Lamps
B3889 Possible Causes
- Faulty Trailer Brake Lamps
- Trailer Brake Lamps harness is open or shorted
- Trailer Brake Lamps circuit poor electrical connection
- Faulty Trailer Lighting Control Module
How do I fix code B3889Check 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.
B3889 04 Trailer Brake Lamps Circuit Open
Cost of diagnosing the B3889 code
Labor: 1.0The cost of diagnosing the B3889 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)
B3889 DescriptionThe brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an analog voltage signal that will increase as the brake pedal is applied. The Body Control Module (BCM) provides a low reference signal and a 5 V reference voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM applies battery voltage to the center high mounted stop lamp control circuit and Trailer Lighting Control Module. The Trailer Lighting Control Module responds by applying battery voltage to the trailer stop lamp control circuit illuminating the trailer stop lamps.
B3889 More InformationNeed more information on how to fix the B3889 code?
Get Access to Factory Service Manuals
Information for specific makes
Need more help?Get the B3889 code diagnosed by a professional: Find a repair shop in your area
CommentsHelp 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 B3889 code? Have you replaced any parts?
Any information is appreciated. Thanks