AutoCodes – Chevrolet – B3950 2015 Chevrolet Silverado

B3950 2015 Chevrolet Silverado 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 2015 Chevrolet Silverado 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.

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Code Popularity 326

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Basic DIY (1 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 17, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B3950 2015 Chevrolet Silverado Description

Ground is applied at all times to the turn signal/multifunction switch. The turn signal lamps may only be activated with the ignition switch in the ON or START positions. When the turn signal/multifunction switch is placed in either the TURN RIGHT or TURN LEFT position, ground is applied to the Body Control Module (BCM) through either the right turn or left turn signal switch signal circuit. The BCM responds to the turn signal switch input by applying a pulsating voltage to the front and rear turn signal lamps through there respective control circuits. When a turn signal request is received by the BCM, a serial data message is sent to the instrument cluster requesting the respective turn signal indicator be pulsed ON and OFF. The Diagnostic Trouble Code (DTC) will be set when the BCM detects a short to voltage, short to ground, or an open/high resistance in the left rear turn signal control circuit.

OBDII Code B3950 2015 Chevrolet Silverado - Left Rear Turn Signal Circuit - AutoCodes.com — B3950 2015 Chevrolet Silverado Code - Left Rear Turn Signal Circuit

What does this mean?

What are the Possible Causes of the DTC B3950 2015 Chevrolet Silverado?

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 2015 Chevrolet Silverado?

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.

What does this mean?

Code Tech Notes

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3950 2015 Chevrolet Silverado 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.

Need more information about the B3950 2015 Chevrolet Silverado code?

Need more information on how to fix the B3950 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 2015 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code B3950 on a 2015 Chevrolet Silverado related to the left rear turn signal circuit?

The common symptoms include the left rear turn signal not working or flashing rapidly, the turn signal indicator on the dashboard blinking quickly, or receiving a warning message on the instrument cluster.

2. What are the possible causes of OBDII code B3950 on a 2015 Chevrolet Silverado indicating a fault in the left rear turn signal circuit?

The code B3950 can be triggered by 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 causing OBDII code B3950 on my 2015 Chevrolet Silverado's left rear turn signal circuit?

You can start by visually inspecting the left rear turn signal bulb for damage or corrosion, checking the wiring harness for any signs of wear or breakage, testing the turn signal switch for proper functionality, and using a diagnostic scanner to read the trouble codes stored in the body control module.

4. What are some repair tips for resolving OBDII code B3950 on a 2015 Chevrolet Silverado associated with the left rear turn signal circuit?

Try replacing the left rear turn signal bulb with a new one, repairing any damaged wiring in the circuit, cleaning or replacing the turn signal switch if necessary, and resetting the fault codes using a diagnostic scanner after completing the repairs.

5. Can a DIY enthusiast fix OBDII code B3950 on a 2015 Chevrolet Silverado related to the left rear turn signal circuit?

Yes, if you have some experience working with automotive electrical systems and the right tools, you may be able to diagnose and repair the issue causing the code B3950. However, if you are unsure or uncomfortable, it's best to seek professional help to avoid further damage.

6. Is it safe to continue driving my 2015 Chevrolet Silverado with OBDII code B3950 indicating a problem in the left rear turn signal circuit?

It is not recommended to drive the vehicle with a malfunctioning turn signal, as it can pose a safety hazard to you and other drivers on the road. It is best to address the issue promptly to ensure proper signaling while driving.

7. How much does it typically cost to repair OBDII code B3950 on a 2015 Chevrolet Silverado associated with the left rear turn signal circuit?

The cost of repair can vary depending on the exact cause of the issue. Replacing a turn signal bulb may cost around $10-$20, while fixing a wiring harness or replacing a faulty switch could range from $50 to $200 or more, including labor charges.

8. Will resetting the OBDII code B3950 on my 2015 Chevrolet Silverado make the issue with the left rear turn signal circuit go away?

Resetting the fault code may temporarily clear the warning light, but it will not fix the underlying problem causing the code to appear. It is essential to diagnose and address the root cause of the issue to prevent the code from reoccurring.

9. How long does it typically take to repair OBDII code B3950 on a 2015 Chevrolet Silverado related to the left rear turn signal circuit?

The repair time can vary based on the complexity of the issue. Replacing a turn signal bulb can be done in a few minutes, while troubleshooting and repairing a wiring or module issue may take an hour or more, depending on the expertise of the technician.

10. Can extreme weather conditions affect the left rear turn signal circuit and trigger OBDII code B3950 on a 2015 Chevrolet Silverado?

Yes, extreme temperatures or moisture can impact the performance of the turn signal circuit components, leading to malfunctions that trigger the B3950 trouble code. It's essential to keep the vehicle protected and perform regular maintenance to prevent weather-related issues.