B3887 Cadillac 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 Cadillac 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 Cadillac Description
What are the Possible Causes of the DTC B3887 Cadillac?
- 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 Cadillac?
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 Cadillac 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.
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Frequently Asked Questions about B3887 Cadillac Code
What does the OBDII code B3887 indicate in a Cadillac?
B3887 indicates a fault in the trailer left turn signal circuit, often related to issues with the trailer wiring or the vehicle’s towing system.
What are common symptoms of the B3887 code?
Common symptoms include the left turn signal not functioning properly, warning lights on the dashboard, or a malfunctioning trailer light when the vehicle is towing.
What can cause the B3887 code to trigger?
Causes can include a short circuit in the trailer wiring, a blown fuse, a faulty turn signal relay, or an issue with the vehicle's body control module.
How can I troubleshoot the B3887 code?
Start by checking the trailer wiring for any visible damage or corrosion, inspect fuses related to the turn signal circuit, and test the turn signal relay for proper operation.
Is it safe to drive with the B3887 code active?
While it may be safe to drive, the malfunctioning turn signal can pose a safety risk when towing, as it may not communicate your intentions to other drivers.
Can I fix the B3887 code myself?
If you have experience with automotive electrical systems, you can inspect and repair the wiring or components. Otherwise, it’s advisable to seek professional help.
What should I do if the code returns after repairs?
If the code returns, further diagnostics may be needed to check for intermittent faults, wiring issues, or the possibility of a defective control module.
Does the B3887 code affect vehicle performance?
Typically, the B3887 code does not affect overall vehicle performance but can compromise safety when towing due to improper signal operation.
Will clearing the B3887 code fix the problem?
Clearing the code may temporarily remove the warning, but if the underlying issue is not resolved, the code will likely reappear.
Could a bad trailer connector cause the B3887 code?
Yes, a faulty or corroded trailer connector can disrupt the signal circuit and trigger the B3887 code.
Discuss the causes and fixes for B3887 Cadillac OBDII Code
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