B3950 Buick Code - Left Rear Turn Signal Circuit
Quick Answer
The B3950 Buick code indicates a problem with the left rear turn signal circuit in the vehicle. Common causes include Faulty left rear turn signal bulb, Corrosion or loose connections in the turn signal wiring, 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
- B3950 Buick indicates Left Rear Turn Signal Circuit.
- Common causes
- Common causes include Faulty left rear turn signal bulb, Corrosion or loose connections in the turn signal wiring, 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code B3950 Buick Description
The B3950 Buick code indicates a problem with the left rear turn signal circuit in the vehicle. This code is typically triggered when the Body Control Module (BCM) detects a malfunction in the circuit that controls the left rear turn signal. The turn signal circuit is an essential component of the vehicle's lighting system, responsible for indicating the driver's intention to turn left to other road users.
Common Causes of B3950 Buick
- Faulty left rear turn signal bulb
- Corrosion or loose connections in the turn signal wiring
- Defective turn signal switch
- BCM malfunction
- Short circuit in the turn signal circuit
Symptoms of B3950 Buick
- Left rear turn signal not working
- Rapid blinking of the turn signal indicator on the dashboard
- Dim or flickering left rear turn signal
- Turn signal staying on continuously without blinking
- Dashboard warning light indicating a turn signal malfunction
How to Fix B3950 Buick
- Begin by inspecting the left rear turn signal bulb to ensure it is not burnt out. Replace the bulb if necessary.
- Check the wiring connections for corrosion or looseness. Clean the connections and secure them properly.
- Test the turn signal switch for proper functionality. Replace the switch if it is faulty.
- Use a multimeter to diagnose any electrical issues in the turn signal circuit, such as a short circuit. Repair or replace any damaged wiring.
- Clear the B3950 code from the vehicle's computer using a diagnostic scanner to reset the system and ensure the issue has been resolved.
Cost to Fix B3950 Buick
The typical repair costs for addressing the B3950 Buick code related to the left rear turn signal circuit can vary depending on the specific cause of the issue. In general, replacing a turn signal bulb can cost between $10 to $30, while repairing wiring connections or replacing the turn signal switch can range from $50 to $200. If the issue is more complex and requires BCM replacement or extensive electrical repairs, the cost can exceed $500. It is advisable to consult with a professional mechanic to get an accurate estimate based on the specific diagnosis and repair needed. Labor rates at auto repair shops can vary, typically ranging from $80 to $150 per hour.
Tech Notes for B3950 Buick
B3950:02 Left Rear Turn Signal Circuit Short to Ground
B3950:04 Left Rear Turn Signal Circuit Open
Need more information about the B3950 Buick code?
Need more information on how to fix the B3950 Buick code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the B3950 Buick code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about B3950 Buick Code
1. What are the common symptoms of OBDII code B3950 Buick related to the Left Rear Turn Signal Circuit?
The common symptoms include the left rear turn signal not working, fast blinking of the turn signal, or a dashboard warning light indicating a turn signal fault.
2. What are the possible causes of OBDII code B3950 Buick for the Left Rear Turn Signal Circuit?
Potential causes can include a faulty turn signal bulb, a damaged wiring harness, a malfunctioning turn signal switch, or a problem with the body control module.
3. How can I diagnose the issue causing OBDII code B3950 for the Left Rear Turn Signal Circuit?
You can start by visually inspecting the left rear turn signal bulb, checking the wiring for any visible damage, testing the turn signal switch, and using a diagnostic scanner to read the specific fault codes.
4. What are some DIY repair tips for fixing OBDII code B3950 Buick related to the Left Rear Turn Signal Circuit?
You can try replacing the left rear turn signal bulb, repairing any damaged wiring, cleaning or replacing the turn signal switch, or resetting the body control module to see if the issue resolves.
5. Is it safe to continue driving with OBDII code B3950 Buick triggered for the Left Rear Turn Signal Circuit?
It is not recommended to drive with a malfunctioning turn signal, as it can pose a safety hazard to you and other drivers on the road. Promptly address the issue to ensure proper signaling.
6. Can a faulty fuse cause OBDII code B3950 Buick to appear for the Left Rear Turn Signal Circuit?
While a blown fuse can affect the turn signal operation, it may not directly trigger this specific diagnostic trouble code. However, checking the fuse for the turn signal circuit is still a good troubleshooting step.
7. How much does it typically cost to repair OBDII code B3950 Buick associated with the Left Rear Turn Signal Circuit?
The cost of repair can vary depending on the underlying cause of the issue. Simple fixes like bulb replacement may cost around $10-$20, while more complex repairs involving wiring or module replacement can range from $100 to $300 or more.
8. Can weather conditions impact the occurrence of OBDII code B3950 Buick for the Left Rear Turn Signal Circuit?
Extreme weather conditions, such as heavy rain or snow, can potentially exacerbate existing issues with the turn signal circuit. Moisture intrusion or exposure to the elements may lead to electrical malfunctions.
9. Are there any recalls or technical service bulletins related to OBDII code B3950 Buick concerning the Left Rear Turn Signal Circuit?
It's advisable to check with your local Buick dealership or visit the National Highway Traffic Safety Administration (NHTSA) website to see if there are any relevant recalls or technical service bulletins addressing this specific OBDII code.
10. Will resetting the OBDII system clear the B3950 code for the Left Rear Turn Signal Circuit?
Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing the fault is not addressed, the code is likely to reappear. It's essential to diagnose and fix the root cause of the problem for a lasting solution.
Discuss the causes and fixes for B3950 Buick OBDII Code
Code B3950 Buick comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.