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Engine-Codes – GMC – B3951 2014 GMC Sierra

B3951 2014 GMC Sierra Code - Right Rear Turn Signal Circuit

Quick Answer

The B3951 diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates an issue with the right rear turn signal circuit. Common causes include Faulty wiring or connection in the right rear turn signal circuit, Defective right rear turn signal bulb, Malfunctioning turn signal switch. 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
B3951 2014 GMC Sierra indicates Right Rear Turn Signal Circuit.
Common causes
Common causes include Faulty wiring or connection in the right rear turn signal circuit, Defective right rear turn signal bulb, Malfunctioning turn signal switch.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code B3951 2014 GMC Sierra Description

The B3951 diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates an issue with the right rear turn signal circuit. This code specifically points to a problem with the electrical system that controls the right rear turn signal on the vehicle. The turn signal circuit is responsible for illuminating the right rear turn signal light when the driver activates the turn signal switch.

OBDII Code B3951 2014 GMC Sierra - Right Rear Turn Signal Circuit
B3951 2014 GMC Sierra Code - Right Rear Turn Signal Circuit

Common Causes of B3951 2014 GMC Sierra

  1. Faulty wiring or connection in the right rear turn signal circuit
  2. Defective right rear turn signal bulb
  3. Malfunctioning turn signal switch
  4. Issue with the body control module
  5. Corrosion or damage to the electrical connections in the turn signal circuit

Symptoms of B3951 2014 GMC Sierra

  1. Right rear turn signal not illuminating
  2. Rapid blinking of the right turn signal
  3. Dashboard indicator flashing rapidly
  4. Turn signal indicator on the right side of the vehicle not functioning
  5. Turn signal staying on continuously without blinking

How to Fix B3951 2014 GMC Sierra

  1. Begin by visually inspecting the right rear turn signal bulb for any signs of damage or burnout. Replace the bulb if necessary.
  2. Check the wiring and connections in the right rear turn signal circuit for any corrosion, damage, or loose connections. Repair or replace as needed.
  3. Test the turn signal switch for proper functionality by checking for continuity and proper operation.
  4. Use a diagnostic tool to scan the vehicle's computer system for any stored fault codes and clear the B3951 code after completing the repair.
  5. If the issue persists after the above steps, consult a professional technician for further diagnosis and repair.

Cost to Fix B3951 2014 GMC Sierra

The cost of repairing the right rear turn signal circuit on a 2014 GMC Sierra can vary depending on the specific cause of the issue. On average, you can expect to pay between $100 and $300 for parts and labor. Keep in mind that diagnostic time and labor rates can vary based on the location, vehicle make and model, and the complexity of the repair. It is recommended to consult with a local auto repair shop for a more accurate estimate.

What does this mean?

Tech Notes for B3951 2014 GMC Sierra

B3951:01 Right Rear Turn Signal Circuit Short to Battery

B3951:02 Right Rear Turn Signal Circuit Short to Ground

B3951:04 Right Rear Turn Signal Circuit Open

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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 B3951 2014 GMC Sierra Code

1. What are some common symptoms of OBDII code B3951 on a 2014 GMC Sierra related to the right rear turn signal circuit?

The common symptoms include the right rear turn signal not functioning properly, rapid flashing of the right turn signal, or a complete failure of the right rear turn signal.

2. What are the possible causes of OBDII code B3951 on a 2014 GMC Sierra indicating a problem with the right rear turn signal circuit?

Possible causes include a faulty right rear turn signal bulb, a damaged wiring harness, a defective turn signal switch, or a problem with the body control module.

3. How can I diagnose and repair OBDII code B3951 on a 2014 GMC Sierra affecting the right rear turn signal circuit?

Start by visually inspecting the right rear turn signal bulb and socket for any damage or corrosion. Check the wiring for any breaks or shorts. Test the turn signal switch and body control module for proper functionality. Replace any faulty components as needed.

4. Can a blown fuse be a potential cause of OBDII code B3951 on a 2014 GMC Sierra related to the right rear turn signal circuit?

Yes, a blown fuse in the turn signal circuit can cause this OBDII code to appear. Check the fuse box for any blown fuses and replace them if necessary.

5. Is it possible for water or moisture to cause OBDII code B3951 on a 2014 GMC Sierra due to a right rear turn signal circuit issue?

Yes, water or moisture entering the right rear turn signal assembly can cause electrical problems leading to this OBDII code. Ensure the turn signal housing is properly sealed to prevent water intrusion.

6. Can a loose or corroded ground connection be a potential reason for OBDII code B3951 on a 2014 GMC Sierra associated with the right rear turn signal circuit?

Yes, a loose or corroded ground connection can disrupt the proper functioning of the right rear turn signal circuit, triggering this OBDII code. Check and clean the ground connections to ensure a solid electrical connection.

7. Should I reset the OBDII code B3951 after repairing the right rear turn signal circuit issue on a 2014 GMC Sierra?

Yes, it is recommended to clear the OBDII code B3951 after repairing the right rear turn signal circuit problem. This can be done using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes.

8. Can a damaged turn signal relay cause OBDII code B3951 to appear on a 2014 GMC Sierra related to the right rear turn signal circuit?

Yes, a faulty turn signal relay can interfere with the proper operation of the right rear turn signal circuit and trigger this OBDII code. Consider testing and replacing the turn signal relay if necessary.

9. Is it possible for a software glitch in the vehicle's computer system to trigger OBDII code B3951 on a 2014 GMC Sierra due to a right rear turn signal circuit malfunction?

While less common, a software glitch in the body control module or other related systems could potentially lead to this OBDII code being generated. In such cases, updating or reflashing the vehicle's software may be necessary.

10. Can a damaged or malfunctioning right rear turn signal socket cause OBDII code B3951 to appear on a 2014 GMC Sierra?

Yes, a damaged or malfunctioning right rear turn signal socket can disrupt the electrical connection and operation of the turn signal circuit, potentially leading to the appearance of this OBDII code. Inspect the socket for any issues and replace if needed.

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