AutoCodes – GMC – B3951 2014 GMC Sierra

B3951 2014 GMC Sierra Code - Right Rear Turn Signal Circuit

Quick Answer

Ground is applied at all times to the turn signal/multifunction switch. Common causes include Faulty Right Rear Turn Signal Lamp, Right Rear Turn Signal Lamp harness is open or shorted, Right Rear Turn Signal Lamp 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: B3951 2014 GMC Sierra indicates Right Rear Turn Signal Circuit.
Common causes: Common causes include Faulty Right Rear Turn Signal Lamp, Right Rear Turn Signal Lamp harness is open or shorted, Right Rear Turn Signal Lamp 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 199

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Basic DIY (1 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 17, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B3951 2014 GMC Sierra Description

Ground is applied at all times to the turn signal/multifunction switch. The turn signal lamps may only be activated with the ignition switch in the ON or START positions. When the turn signal/multifunction switch is placed in either the TURN RIGHT or TURN LEFT position, ground is applied to the Body Control Module (BCM) through either the right turn or left turn signal switch signal circuit. The BCM responds to the turn signal switch input by applying a pulsating voltage to the front and rear turn signal lamps through there respective control circuits. When a turn signal request is received by the BCM, a serial data message is sent to the instrument cluster requesting the respective turn signal indicator be pulsed ON and OFF. The Diagnostic Trouble Code (DTC) will be set when the BCM detects a short to voltage, short to ground, or an open/high resistance in the right rear turn signal control circuit.

OBDII Code B3951 2014 GMC Sierra - Right Rear Turn Signal Circuit - AutoCodes.com — B3951 2014 GMC Sierra Code - Right Rear Turn Signal Circuit

What does this mean?

What are the Possible Causes of the DTC B3951 2014 GMC Sierra?

Faulty Right Rear Turn Signal Lamp
Right Rear Turn Signal Lamp harness is open or shorted
Right Rear Turn Signal Lamp circuit poor electrical connection

How to Fix the DTC B3951 2014 GMC Sierra?

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

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3951 2014 GMC Sierra 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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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.