AutoCodes – Chevrolet – B3949 2018 Chevrolet Silverado

B3949 2018 Chevrolet Silverado Code - Right Front Turn Signal Circuit

Quick Answer

Ground is applied at all times to the turn signal/multifunction switch. Common causes include Faulty Right Front Turn Signal Lamp, Right Front Turn Signal Lamp harness is open or shorted, Right Front 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: B3949 2018 Chevrolet Silverado indicates Right Front Turn Signal Circuit.
Common causes: Common causes include Faulty Right Front Turn Signal Lamp, Right Front Turn Signal Lamp harness is open or shorted, Right Front 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 321

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

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

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3949 2018 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 an open/high resistance in the left front turn signal control circuit.

OBDII Code B3949 2018 Chevrolet Silverado - Right Front Turn Signal Circuit - AutoCodes.com — B3949 2018 Chevrolet Silverado Code - Right Front Turn Signal Circuit

What does this mean?

What are the Possible Causes of the DTC B3949 2018 Chevrolet Silverado?

Faulty Right Front Turn Signal Lamp
Right Front Turn Signal Lamp harness is open or shorted
Right Front Turn Signal Lamp circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B3949 2018 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3949 2018 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 B3949 2018 Chevrolet Silverado code?

Need more information on how to fix the B3949 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3949 2018 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 B3949 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code B3949 in a 2018 Chevrolet Silverado's right front turn signal circuit?

The common symptoms include the right front turn signal not working properly or flashing at an incorrect rate.

2. What could be the possible causes of OBDII code B3949 in a 2018 Chevrolet Silverado?

Possible causes may include a faulty right front turn signal bulb, a damaged turn signal wiring harness, or a malfunctioning turn signal switch.

3. How can I diagnose the OBDII code B3949 in my 2018 Chevrolet Silverado's right front turn signal circuit?

You can start by visually inspecting the right front turn signal bulb, checking the wiring harness for any visible damage, and testing the turn signal switch for proper functionality.

4. Can a blown fuse cause OBDII code B3949 in a 2018 Chevrolet Silverado?

Yes, a blown fuse related to the right front turn signal circuit can trigger OBDII code B3949 on a 2018 Chevrolet Silverado.

5. Is it possible to repair OBDII code B3949 in a 2018 Chevrolet Silverado at home?

Depending on the specific cause, you may be able to repair the issue at home by replacing the faulty bulb, repairing damaged wiring, or replacing the turn signal switch.

6. Should I be concerned about driving my 2018 Chevrolet Silverado with OBDII code B3949 in the right front turn signal circuit?

It is recommended to address the issue promptly to ensure proper functioning of your vehicle's turn signal system, which is crucial for safety on the road.

7. How much does it typically cost to repair OBDII code B3949 in a 2018 Chevrolet Silverado at a professional auto repair shop?

The cost of repairing OBDII code B3949 can vary depending on the specific cause and the labor rates of the auto repair shop. It is advisable to get a diagnostic assessment for an accurate estimate.

8. Can moisture or water damage trigger OBDII code B3949 in a 2018 Chevrolet Silverado's right front turn signal circuit?

Yes, moisture or water intrusion into the turn signal assembly or wiring can cause electrical issues leading to OBDII code B3949.

9. Are there any recalls or technical service bulletins related to OBDII code B3949 in a 2018 Chevrolet Silverado?

It's recommended to check with authorized Chevrolet service centers or visit the manufacturer's website to see if there are any relevant recalls or technical service bulletins related to this issue.

10. How can I prevent OBDII code B3949 from occurring in my 2018 Chevrolet Silverado's right front turn signal circuit in the future?

Regularly inspecting and maintaining your vehicle's turn signal system, including checking for proper bulb function and addressing any signs of water damage, can help prevent OBDII code B3949 from occurring.