B3950 2015 GMC Sierra Code - Left Rear Turn Signal Circuit
Quick Answer
The B3950 diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the Left Rear Turn Signal Circuit. Common causes include Faulty left rear turn signal bulb, Damaged wiring harness leading to the left rear turn signal, 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
- B3950 2015 GMC Sierra indicates Left Rear Turn Signal Circuit.
- Common causes
- Common causes include Faulty left rear turn signal bulb, Damaged wiring harness leading to the left rear turn signal, 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.
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Code B3950 2015 GMC Sierra Description
The B3950 diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the Left Rear Turn Signal Circuit. This code indicates that there is a malfunction in the electrical circuit responsible for controlling the left rear turn signal on the vehicle. The turn signal circuit is a crucial component of the vehicle's lighting system, which is essential for signaling intentions to other drivers on the road. When this circuit is compromised, it can lead to safety concerns, as other drivers may not be aware of the driver's intentions to turn or change lanes.
Common Causes of B3950 2015 GMC Sierra
- Faulty left rear turn signal bulb
- Damaged wiring harness leading to the left rear turn signal
- Malfunctioning turn signal switch
- Blown fuse related to the left rear turn signal circuit
- Corrosion or poor connections in the turn signal circuit
Symptoms of B3950 2015 GMC Sierra
- 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 indicator staying on continuously
- Turn signal not turning off after completing a turn
How to Fix B3950 2015 GMC Sierra
- Begin by visually inspecting the left rear turn signal bulb for any signs of damage or burnout. Replace the bulb if necessary.
- Check the wiring harness leading to the left rear turn signal for any visible damage or corrosion. Repair or replace any damaged wiring.
- Test the turn signal switch for proper functionality. Replace the switch if it is found to be faulty.
- Inspect the fuses related to the left rear turn signal circuit and replace any blown fuses.
- Clear the DTC from the vehicle's computer using a diagnostic scan tool to reset the system and ensure the issue has been resolved.
Cost to Fix B3950 2015 GMC Sierra
The cost of repairing a B3950 code related to the Left Rear Turn Signal Circuit on a 2015 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of replacing a turn signal bulb ranges from $5 to $20, while repairing or replacing damaged wiring can cost between $50 and $200. A new turn signal switch typically costs between $50 and $150, and replacing fuses is relatively inexpensive. Labor costs for this type of repair can range from $80 to $150 per hour, with the total repair cost likely falling between $100 and $500. It is recommended to consult with a professional mechanic to obtain a more accurate estimate based on the specific circumstances of the vehicle.
Tech Notes for B3950 2015 GMC Sierra
B3950:02 Left Rear Turn Signal Circuit Short to Ground
B3950:04 Left Rear Turn Signal Circuit Open
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Frequently Asked Questions about B3950 2015 GMC Sierra Code
1. What are the common symptoms of OBDII code B3950 in a 2015 GMC Sierra 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 indicator on the dashboard, or a complete failure of the left rear turn signal.
2. What are some possible causes of OBDII code B3950 in a 2015 GMC Sierra?
Possible causes include a faulty left rear turn signal bulb, a damaged turn signal socket, a wiring issue in the left rear turn signal circuit, or a malfunctioning turn signal switch.
3. How can I diagnose the cause of OBDII code B3950 in my 2015 GMC Sierra's left rear turn signal circuit?
You can start by visually inspecting the left rear turn signal bulb and socket for any signs of damage. Check the wiring harness for any visible issues or loose connections. Using a multimeter, test the continuity of the wiring to identify any breaks or shorts.
4. Can I repair OBDII code B3950 in my 2015 GMC Sierra's left rear turn signal circuit myself?
Depending on the cause, you may be able to repair it yourself by replacing a faulty bulb, repairing a damaged socket, or fixing a wiring issue. However, if the problem is more complex, it may require professional diagnosis and repair.
5. Is it safe to drive my 2015 GMC Sierra with OBDII code B3950 affecting the left rear turn signal circuit?
Driving with a malfunctioning turn signal can be dangerous, as it may lead to accidents or traffic violations. It is recommended to address the issue promptly to ensure the proper functioning of your vehicle's turn signals.
6. Can a bad turn signal switch cause OBDII code B3950 in a 2015 GMC Sierra?
Yes, a malfunctioning turn signal switch can potentially cause OBDII code B3950 in the left rear turn signal circuit of a 2015 GMC Sierra. It is one of the possible causes that should be investigated during diagnosis.
7. How much does it typically cost to repair OBDII code B3950 in a 2015 GMC Sierra's left rear turn signal circuit?
The cost of repair can vary depending on the specific cause of the issue. Replacing a bulb or repairing a socket may be relatively inexpensive, while fixing a wiring problem or replacing a turn signal switch can be more costly.
8. Will resetting the OBDII code B3950 in my 2015 GMC Sierra make the left rear turn signal work again?
Resetting the code may temporarily turn off the warning light, but it will not fix the underlying issue causing the left rear turn signal malfunction. It is important to diagnose and repair the problem to ensure proper functionality.
9. Are there any preventive measures to avoid OBDII code B3950 in a 2015 GMC Sierra's left rear turn signal circuit?
Regularly inspecting and maintaining the turn signal bulbs, sockets, and wiring can help prevent issues like OBDII code B3950 from occurring. Addressing any minor problems promptly can help avoid more significant issues in the future.
10. Can extreme weather conditions affect the left rear turn signal circuit and trigger OBDII code B3950 in a 2015 GMC Sierra?
Extreme weather conditions such as heavy rain, snow, or intense heat can potentially damage the turn signal components, leading to malfunctions that trigger OBDII code B3950. It is essential to ensure the turn signal system is properly sealed and protected from the elements.
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