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B3950 2014 Chevrolet Silverado Code - Left Rear Turn Signal Circuit

Quick Answer

The B3950 diagnostic trouble code (DTC) for the 2014 Chevrolet Silverado indicates a problem with the left rear turn signal circuit. Common causes include Burnt-out left rear turn signal bulb, Damaged or corroded wiring in the left rear turn signal circuit, Faulty turn signal switch or BCM. 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 Chevrolet Silverado indicates Left Rear Turn Signal Circuit.
Common causes
Common causes include Burnt-out left rear turn signal bulb, Damaged or corroded wiring in the left rear turn signal circuit, Faulty turn signal switch or BCM.
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.
What is this?
Table of contents Created and updated by William Orellana on Oct 08, 2024
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Code B3950 2014 Chevrolet Silverado Description

The B3950 diagnostic trouble code (DTC) for the 2014 Chevrolet Silverado indicates a problem with the left rear turn signal circuit. This code is part of the vehicle's body control module (BCM) diagnostics, which monitors various lighting and signaling systems. When the BCM detects an issue with the left rear turn signal circuit, it triggers this code to alert the driver and technicians of a potential malfunction.

OBDII Code B3950 2014 Chevrolet Silverado - Left Rear Turn Signal Circuit
B3950 2014 Chevrolet Silverado Code - Left Rear Turn Signal Circuit

Common Causes of B3950 2014 Chevrolet Silverado

  1. Burnt-out left rear turn signal bulb.
  2. Damaged or corroded wiring in the left rear turn signal circuit.
  3. Faulty turn signal switch or BCM.
  4. Poor ground connection affecting the left rear turn signal circuit.
  5. Water intrusion or moisture damage in the bulb socket or wiring harness.

Symptoms of B3950 2014 Chevrolet Silverado

  1. Left rear turn signal not functioning or flickering.
  2. Dashboard warning light indicating a turn signal issue.
  3. Hyper-flashing of the turn signal indicator on the dashboard.
  4. Inconsistent operation of the left rear turn signal (works intermittently).
  5. Possible malfunction of other lighting systems, such as brake lights or hazard lights.

How to Fix B3950 2014 Chevrolet Silverado

  1. Visual Inspection: Begin with a thorough visual inspection of the left rear turn signal bulb, socket, and wiring. Look for signs of corrosion, damage, or loose connections.
  2. Bulb Replacement: If the bulb is burnt out, replace it with a new one. Ensure that the bulb type matches the specifications for the vehicle.
  3. Wiring Repair: If any damaged wiring or connectors are found, repair or replace them as necessary. This may involve splicing new wire or using electrical connectors to ensure a solid connection.
  4. Ground Check: Verify the ground connection for the left rear turn signal circuit. Clean any corroded ground points and ensure a solid connection to the chassis.
  5. BCM Testing: If the issue persists after addressing the bulb and wiring, test the BCM for faults. This may require specialized diagnostic equipment to read BCM data and perform a reset if necessary.

Cost to Fix B3950 2014 Chevrolet Silverado

The typical repair costs for addressing the B3950 code can vary widely based on the specific issue and the labor rates in your area. Generally, you can expect to pay between $100 and $300 for repairs, which may include parts like bulbs, wiring, and connectors, as well as labor costs. Labor rates typically range from $80 to $150 per hour, depending on the shop's location and reputation. In metropolitan areas or at dealerships, rates may be higher, while independent shops often offer more competitive pricing. It is advisable to obtain quotes from local repair shops to get a more precise estimate tailored to your specific situation.

What does this mean?

Tech Notes for B3950 2014 Chevrolet Silverado

B3950:01 Left Rear Turn Signal Circuit Short to Battery

B3950:02 Left Rear Turn Signal Circuit Short to Ground

B3950:04 Left Rear Turn Signal Circuit Open

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B3950 2014 Chevrolet Silverado Code

1. What does the OBDII code B3950 mean on a 2014 Chevrolet Silverado?

B3950 indicates an issue with the left rear turn signal circuit, such as a malfunction or open/short in the wiring or component.

2. What are the common symptoms of the B3950 code in a 2014 Silverado?

Symptoms include the left rear turn signal not working, rapid flashing of the turn signal indicator, or a warning light on the dashboard.

3. What causes the B3950 code to appear?

Common causes include a burned-out left rear turn signal bulb, damaged wiring, a faulty bulb socket, or a malfunctioning Body Control Module (BCM).

4. How do I diagnose the B3950 code in my Silverado?

Start by visually inspecting the left rear turn signal bulb and socket, checking for damage or corrosion. Then, test the wiring for continuity and scan the BCM for additional trouble codes.

5. Can a burned-out bulb trigger the B3950 code?

Yes, a burned-out left rear turn signal bulb is one of the most common reasons for this code.

6. How do I fix the B3950 code on my 2014 Silverado?

Replace the left rear turn signal bulb if it’s burned out. If the bulb is fine, check and repair or replace damaged wiring, connectors, or the bulb socket. If necessary, reprogram or replace the BCM.

7. Can a faulty BCM cause the B3950 code?

Yes, a malfunctioning Body Control Module can cause the B3950 code if it’s unable to properly control the turn signal circuit.

8. How much does it cost to fix the B3950 code on a 2014 Silverado?

The cost varies depending on the issue, ranging from $10–$30 for a new bulb to $200–$1,000 if the BCM needs replacement or reprogramming.

9. Can I drive my 2014 Silverado with the B3950 code active?

It’s not recommended to drive for extended periods with this code active, as the left rear turn signal not working can pose a safety hazard.

10. Will clearing the code fix the B3950 issue?

Clearing the code without addressing the underlying issue will not fix the problem, and the code is likely to return. Proper diagnosis and repair are necessary.

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