AutoCodes.com | All About OBDII Engine Codes
AutoCodes - Chevrolet - B3890 Chevrolet

B3890 Chevrolet Code - Trailer Backup Lamps Circuit

- Code Popularity: 487 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
Share on Facebook   Share on Twitter   Share on Linkedin

What are the Possible Causes of the DTC B3890 Chevrolet?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Trailer Backup Lamps
  • Trailer Backup Lamps harness is open or shorted
  • Trailer Backup Lamps circuit poor electrical connection
  • Faulty Trailer Lighting Control Module
⚠ Does your Chevrolet have Safety Recalls? → Check here

How to Fix the DTC B3890 Chevrolet?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Code Tech Notes

B3890 02 Trailer Backup Lamps Circuit Short to Ground
B3890 04 Trailer Backup Lamps Circuit Open

Search for B3890 Chevrolet Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3890 Chevrolet code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code B3890 Chevrolet Description

The Trailer Lighting Control Module receives a serial data message from the Body Control Module (BCM) indicating that the vehicle backup lamps have been activated. The Trailer Lighting Control Module responds by applying battery voltage to the trailer backup lamp control circuit illuminating the trailer backup 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 trailer backup lamps control circuit.

OBDII Code B3890 Chevrolet - Trailer Backup Lamps Circuit - AutoCodes.com
B3890 Chevrolet Code - Trailer Backup Lamps Circuit

Need More Information on the Code?

Need more information on how to fix the B3890 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3890 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Code B3890 Chevrolet comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the B3890 Chevrolet code? Have you replaced any parts?
Any information is appreciated. Thanks