B3950 2018 GMC Sierra Code - Left Rear Turn Signal Circuit
Quick Answer
Ground is applied at all times to the turn signal/multifunction switch. Common causes include Faulty Left Rear Turn Signal Lamp, Left Rear Turn Signal Lamp harness is open or shorted, Left 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
- B3950 2018 GMC Sierra indicates Left Rear Turn Signal Circuit.
- Common causes
- Common causes include Faulty Left Rear Turn Signal Lamp, Left Rear Turn Signal Lamp harness is open or shorted, Left 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.
Code B3950 2018 GMC Sierra Description
What are the Possible Causes of the DTC B3950 2018 GMC Sierra?
- Faulty Left Rear Turn Signal Lamp
- Left Rear Turn Signal Lamp harness is open or shorted
- Left Rear Turn Signal Lamp circuit poor electrical connection
How to Fix the DTC B3950 2018 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.
Code Tech Notes
B3950:02 Left Rear Turn Signal Circuit Short to Ground
B3950:04 Left Rear Turn Signal Circuit Open
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B3950 2018 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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Frequently Asked Questions about B3950 2018 GMC Sierra Code
1. What are the common symptoms of OBDII code B3950 in a 2018 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 warning message displayed on the instrument cluster.
2. What are the possible causes of OBDII code B3950 in a 2018 GMC Sierra?
Possible causes of this code could be a faulty left rear 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 with the Left Rear Turn Signal Circuit in a 2018 GMC Sierra?
You can start by visually inspecting the left rear turn signal bulb and its connection. Check for any visible damage to the wiring harness. Using a multimeter, test the continuity of the circuit and check for any voltage drops.
4. Can I repair OBDII code B3950 in a 2018 GMC Sierra on my own?
Depending on your level of automotive experience, you may be able to replace a faulty bulb or repair a damaged wire on your own. However, more complex issues involving the electrical system or modules may require professional diagnosis and repair.
5. What are some tips for fixing OBDII code B3950 in a 2018 GMC Sierra?
Ensure you use the correct replacement bulb for the left rear turn signal. Properly secure any repaired wiring connections to prevent future issues. Clear the trouble codes after completing the repair to reset the system.
6. Is it safe to drive my 2018 GMC Sierra with OBDII code B3950 related to the Left Rear Turn Signal Circuit?
It is not recommended to drive the vehicle with a malfunctioning turn signal, as it compromises road safety. Other drivers may not be able to anticipate your turns or lane changes, increasing the risk of accidents.
7. How much does it typically cost to repair OBDII code B3950 in a 2018 GMC Sierra?
The cost of repair can vary depending on the specific issue causing the code. Replacing a turn signal bulb is relatively inexpensive, while repairing or replacing a damaged wiring harness or module can be more costly. Consult a mechanic for an accurate estimate.
8. Can extreme weather conditions affect the Left Rear Turn Signal Circuit in a 2018 GMC Sierra?
Yes, extreme weather conditions such as heavy rain or snow can cause water damage to the wiring harness or connectors, leading to electrical issues and triggering OBDII code B3950. It's essential to protect the electrical components from exposure to harsh elements.
9. Will resetting the vehicle's battery clear OBDII code B3950 in a 2018 GMC Sierra?
Resetting the battery may temporarily clear the code, but it will likely reappear if the underlying issue with the Left Rear Turn Signal Circuit is not addressed. It's important to diagnose and repair the root cause of the problem to prevent the code from returning.
10. How can I prevent OBDII code B3950 from recurring in my 2018 GMC Sierra in the future?
Regularly inspect and maintain the vehicle's lighting system, including the turn signals, to ensure they are functioning properly. Address any issues promptly to prevent further damage to the electrical components and avoid triggering the code again.
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