AutoCodes – Buick – B3949 Buick

B3949 Buick 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 Buick 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 1,157

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 Buick 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 Buick - Right Front Turn Signal Circuit - AutoCodes.com — B3949 Buick Code - Right Front Turn Signal Circuit

What does this mean?

What are the Possible Causes of the DTC B3949 Buick?

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 Buick?

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 Buick 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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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 Buick Code

1. What are the common symptoms of OBDII code B3949 Buick related to the Right Front Turn Signal Circuit?

The common symptoms include the right front turn signal not working, fast blinking of the turn signal, or a warning light on the dashboard indicating a turn signal malfunction.

2. What are the possible causes of OBDII code B3949 Buick for the Right Front Turn Signal Circuit?

Possible causes include a faulty turn signal bulb, a damaged wiring harness, a malfunctioning turn signal switch, or a problem with the Body Control Module (BCM).

3. How can I diagnose the issue with OBDII code B3949 Buick for the Right Front Turn Signal Circuit?

You can start by visually inspecting the right front turn signal bulb for any signs of damage. Check the wiring harness for any breaks or corrosion. Using a multimeter, test the continuity of the circuit and inspect the turn signal switch for proper operation.

4. Can I repair OBDII code B3949 Buick for the Right Front Turn Signal Circuit myself?

If you have some experience with automotive repairs and the necessary tools, you may be able to repair the issue yourself by replacing the faulty turn signal bulb, repairing the wiring harness, or replacing the turn signal switch.

5. Is it safe to drive with OBDII code B3949 Buick related to the Right Front Turn Signal Circuit?

It is not safe to drive with a malfunctioning turn signal as it can lead to accidents or traffic violations. It is recommended to address the issue promptly to ensure your safety and the safety of others on the road.

6. How much does it typically cost to repair OBDII code B3949 Buick for the Right Front Turn Signal Circuit at a mechanic's shop?

The cost of repairs can vary depending on the exact cause of the issue and the labor rates in your area. On average, repairing the Right Front Turn Signal Circuit can cost between $50 to $200 at a mechanic's shop.

7. Can a low battery voltage trigger OBDII code B3949 Buick for the Right Front Turn Signal Circuit?

Yes, low battery voltage can sometimes cause electrical issues, including problems with the turn signal circuit. It is recommended to ensure that the vehicle's battery is in good condition and properly charged.

8. How long does it take to repair OBDII code B3949 Buick for the Right Front Turn Signal Circuit?

The repair time can vary based on the exact cause of the issue and the complexity of the repair. In general, it can take anywhere from 30 minutes to a few hours to diagnose and repair the Right Front Turn Signal Circuit.

9. Can OBDII code B3949 Buick for the Right Front Turn Signal Circuit affect other electrical systems in the vehicle?

While the code specifically relates to the right front turn signal circuit, electrical issues can sometimes have broader effects on other systems in the vehicle. It is essential to address the problem promptly to prevent further electrical issues.

10. Will resetting the OBDII system clear the B3949 Buick code for the Right Front Turn Signal Circuit?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear. It is recommended to diagnose and repair the root cause of the problem to prevent the code from coming back.