AutoCodes – Chevrolet – B3888 Chevrolet

B3888 Chevrolet Code - Trailer Right 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 Right Turn Signal, Trailer Right Turn Signal harness is open or shorted, Trailer Right 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: B3888 Chevrolet indicates Trailer Right Turn Signal Circuit.
Common causes: Common causes include Faulty Trailer Right Turn Signal, Trailer Right Turn Signal harness is open or shorted, Trailer Right 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.

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Code Popularity 995

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 23, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B3888 Chevrolet 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 Chevrolet - Trailer Right Turn Signal Circuit - AutoCodes.com — B3888 Chevrolet Code - Trailer Right Turn Signal Circuit

What does this mean?

What are the Possible Causes of the DTC B3888 Chevrolet?

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 to Fix the DTC B3888 Chevrolet?

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.

What does this mean?

Code Tech Notes

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3888 Chevrolet 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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Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B3888 Chevrolet Code

1. What does the OBDII code B3888 mean on a Chevrolet?

B3888 indicates a fault in the trailer right turn signal circuit, typically caused by an open, short, or malfunction in the wiring or connector.

2. What are the common symptoms of code B3888 in a Chevrolet?

Symptoms may include the trailerâ€™s right turn signal not functioning, a dashboard warning light, or irregular flashing of the turn signal.

3. What causes the B3888 code to appear on a Chevrolet?

Common causes include damaged wiring, corroded or loose connectors, a faulty trailer module, or a blown fuse.

4. How can I diagnose the B3888 code on my Chevrolet?

Check the wiring and connectors for the trailer turn signal circuit, inspect the fuses, and use a multimeter to test for continuity or shorts in the circuit.

5. Can a faulty trailer module cause the B3888 code in a Chevrolet?

Yes, a malfunctioning trailer control module can disrupt the right turn signal circuit and trigger the B3888 code.

6. Is it safe to drive with the B3888 code on my Chevrolet?

While the vehicle is safe to drive, towing with an inoperative trailer turn signal is unsafe and may be illegal.

7. What should I check first when troubleshooting the B3888 code?

Start by inspecting the trailer wiring harness and connectors for damage, corrosion, or loose connections.

8. Can a blown fuse cause the B3888 code on a Chevrolet?

Yes, a blown fuse in the trailer turn signal circuit can trigger this code. Check the fuse box for any faulty fuses.

9. How do I fix the B3888 code on a Chevrolet?

Repairs may include replacing damaged wiring, cleaning or securing connectors, replacing the fuse, or repairing/replacing the trailer module.

10. Do I need professional help to fix the B3888 code on my Chevrolet?

If basic checks like wiring and fuse inspection donâ€™t resolve the issue, itâ€™s best to consult a professional technician for further diagnosis and repair.