B3951 2015 GMC Sierra Code - Right Rear Turn Signal Circuit
Quick Answer
The B3951 diagnostic trouble code (DTC) for the 2015 GMC Sierra specifically refers to an issue with the right rear turn signal circuit. Common causes include Faulty right rear turn signal bulb, Damaged wiring harness, Defective 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 2015 GMC Sierra indicates Right Rear Turn Signal Circuit.
- Common causes
- Common causes include Faulty right rear turn signal bulb, Damaged wiring harness, Defective 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.
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Code B3951 2015 GMC Sierra Description
The B3951 diagnostic trouble code (DTC) for the 2015 GMC Sierra specifically refers to an issue with the right rear turn signal circuit. This code indicates that there is a problem with the electrical circuit that controls the right rear turn signal on the vehicle. The turn signal circuit is responsible for activating the right rear turn signal light when the driver indicates a right turn or lane change.
Common Causes of B3951 2015 GMC Sierra
- Faulty right rear turn signal bulb
- Damaged wiring harness
- Defective turn signal switch
- Issue with the body control module
- Corrosion or poor connection in the electrical system
Symptoms of B3951 2015 GMC Sierra
- Right rear turn signal not working
- Rapid blinking of the right turn signal on the dashboard
- Turn signal indicator staying on continuously
- Dim or flickering right rear turn signal light
How to Fix B3951 2015 GMC Sierra
- Begin by visually inspecting the right rear turn signal bulb to check for any signs of damage or burnout. Replace the bulb if necessary.
- Inspect the wiring harness connected to the right rear turn signal for any cuts, frays, or damage. Repair or replace the wiring harness as needed.
- Test the turn signal switch to ensure it is functioning correctly. Replace the switch if it is found to be faulty.
- If the above steps do not resolve the issue, further diagnostic testing may be required to check the body control module for any faults or errors.
Cost to Fix B3951 2015 GMC Sierra
The cost of repairing a right rear turn signal circuit issue can vary depending on the specific cause of the problem and the extent of the repairs needed. In general, replacing a turn signal bulb may cost around $10-$20, while repairing or replacing a wiring harness could range from $50-$200. If the turn signal switch needs to be replaced, the cost can be between $100-$300. More complex repairs involving the body control module may cost upwards of $500-$1000. Additionally, labor costs for diagnosis and repair can range from $80-$150 per hour. It's recommended to get a detailed estimate from a qualified mechanic or auto repair shop to determine the exact cost for your specific situation.
Tech Notes for B3951 2015 GMC Sierra
B3951:02 Right Rear Turn Signal Circuit Short to Ground
B3951:04 Right Rear Turn Signal Circuit Open
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Frequently Asked Questions about B3951 2015 GMC Sierra Code
What does the OBDII code B3951 mean for a 2015 GMC Sierra?
The code B3951 indicates a fault in the right rear turn signal circuit, often due to wiring, a bulb issue, or a failed module.
What are the symptoms of code B3951 on a GMC Sierra?
Symptoms may include the right rear turn signal not working, rapid flashing of the turn signal indicator, or a warning message on the dashboard.
What causes the B3951 code to appear on a 2015 GMC Sierra?
Common causes include a burned-out bulb, damaged wiring, corroded connectors, or a malfunctioning Body Control Module (BCM).
Can a faulty turn signal bulb trigger code B3951?
Yes, a failed or incorrect bulb can disrupt the circuit and trigger the B3951 code.
How do you diagnose code B3951 on a GMC Sierra?
Start by inspecting the right rear turn signal bulb, wiring, and connectors for damage or corrosion. Use a scan tool to check for related codes and test the circuit.
Can driving with code B3951 cause further damage?
While it may not cause immediate damage, driving with a faulty turn signal can pose safety risks and lead to potential traffic violations.
How do you fix code B3951 on a 2015 GMC Sierra?
Repair steps include replacing the turn signal bulb, repairing damaged wiring or connectors, and resetting the code with a scan tool.
Does the B3951 code require replacing the BCM?
Not always. Replace the Body Control Module only if other repairs fail and diagnostics confirm it is faulty.
Will clearing the B3951 code solve the issue permanently?
No, clearing the code without addressing the underlying problem will likely result in the code returning.
How much does it cost to fix code B3951 on a GMC Sierra?
Costs vary based on the issue. Replacing a bulb may cost $10-$30, while BCM repairs can exceed $300-$500, plus labor.
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