B3887 Code - Trailer Left Turn Signal Circuit
Quick Answer
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. Common causes include Faulty Trailer Left Turn Signal, Trailer Left Turn Signal harness is open or shorted, Trailer Left Turn Signal circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- B3887 indicates Trailer Left Turn Signal Circuit.
- Common causes
- Common causes include Faulty Trailer Left Turn Signal, Trailer Left Turn Signal harness is open or shorted, Trailer Left Turn Signal circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code B3887 Description
What are the Possible Causes of the DTC B3887?
- 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 to Fix the DTC B3887?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
B3887 04 Trailer Left Turn Signal Circuit Open
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B3887 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the B3887 code?
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Need Help with the Code?
Get the B3887 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- B3887 Buick — Trailer Left Turn Signal Circuit
- B3887 Cadillac — Trailer Left Turn Signal Circuit
- B3887 Chevrolet — Trailer Left Turn Signal Circuit
- B3887 GMC — Trailer Left Turn Signal Circuit
Frequently Asked Questions about B3887 Code
1. What are the common symptoms of OBDII code B3887 (Trailer Left Turn Signal Circuit)?
- Common symptoms include the trailer left turn signal not functioning properly or not working at all when activated.
2. What are some possible causes of OBDII code B3887?
- Possible causes may include a faulty trailer left turn signal bulb, damaged wiring connections, or a malfunctioning turn signal switch.
3. How can I diagnose the issue related to OBDII code B3887?
- You can start by checking the trailer left turn signal bulb for any visible damage or signs of malfunction. Inspect the wiring connections for loose or corroded terminals. Use a multimeter to test for continuity along the circuit.
4. Is it safe to continue driving with OBDII code B3887 triggered?
- It is not recommended to drive with a malfunctioning trailer left turn signal, as it can pose a safety hazard to you and other drivers on the road.
5. Can I repair OBDII code B3887 myself, or should I seek professional help?
- Depending on your level of automotive expertise, you may be able to repair the issue yourself by replacing the faulty bulb or repairing the damaged wiring. However, if you are unsure, it is best to seek professional help.
6. Are there any specific troubleshooting tips for OBDII code B3887?
- You can start by inspecting the trailer left turn signal wiring harness for any visible damage or wear. Check the fuse related to the turn signal circuit and ensure it is not blown.
7. Will resetting the OBDII code B3887 resolve the issue temporarily?
- Resetting the code may temporarily turn off the warning light, but it will not fix the underlying issue causing the trailer left turn signal malfunction.
8. Are there any common mistakes to avoid when dealing with OBDII code B3887?
- Avoid neglecting the issue, as a malfunctioning trailer left turn signal can lead to accidents. Also, ensure you are addressing the root cause of the problem rather than just resetting the code.
9. Can extreme weather conditions affect the trailer left turn signal circuit triggering OBDII code B3887?
- Yes, extreme weather conditions such as heavy rain or snow can cause corrosion or damage to the wiring connections, leading to issues with the trailer left turn signal circuit.
10. How much can I expect to pay for professional repairs related to OBDII code B3887?
- The cost of professional repairs can vary depending on the exact cause of the issue. It is recommended to get a diagnosis from a trusted mechanic to determine the specific repair costs.
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