B3950 2014 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 2014 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 2014 GMC Sierra Description
What are the Possible Causes of the DTC B3950 2014 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 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.
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 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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Frequently Asked Questions about B3950 2014 GMC Sierra Code
1. What does the OBDII code B3950 mean on a 2014 GMC Sierra?
The B3950 code indicates a malfunction in the left rear turn signal circuit, often caused by wiring, bulb, or control module issues.
2. What are the symptoms of the B3950 code on a GMC Sierra?
Symptoms include the left rear turn signal not working, rapid turn signal flashing, or the turn signal indicator staying illuminated.
3. What causes the B3950 code to appear?
Common causes include a burned-out left rear turn signal bulb, damaged wiring, a faulty connector, or a malfunctioning body control module (BCM).
4. Can a bad bulb trigger the B3950 code?
Yes, a defective or burned-out left rear turn signal bulb can cause this code to appear.
5. How do you diagnose the B3950 code on a 2014 GMC Sierra?
Start by inspecting the left rear turn signal bulb, socket, and wiring for damage, then check the connectors and test the circuit for continuity.
6. Is the B3950 code serious?
While not critical, the code affects your turn signal functionality, which is important for safe driving and legal compliance.
7. How do you fix the B3950 code on a GMC Sierra?
Repairs may involve replacing the bulb, repairing damaged wiring, cleaning corroded connectors, or reprogramming/replacing the BCM if necessary.
8. Can a bad Body Control Module (BCM) cause the B3950 code?
Yes, a malfunctioning BCM can fail to properly control the turn signal circuit, triggering this code.
9. Why is my turn signal blinking fast with the B3950 code?
Rapid flashing indicates a fault in the turn signal circuit, often due to a burned-out bulb or a wiring issue.
10. How much does it cost to fix the B3950 code?
Costs vary depending on the issue but typically range from $20 for a bulb replacement to $400 or more if the BCM needs replacement.
Discuss the causes and fixes for B3950 2014 GMC Sierra OBDII Code
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