AutoCodes – Pontiac – B3949 Pontiac

B3949 Pontiac 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 Pontiac 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 1,028

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

What does this mean?

What are the Possible Causes of the DTC B3949 Pontiac?

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 Pontiac?

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 Pontiac 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 Pontiac Code

1. What are common symptoms of OBDII code B3949 Pontiac related to the right front turn signal circuit?

- Common symptoms include the right front turn signal not working, flashing rapidly, or staying on continuously.

2. What are possible causes of OBDII code B3949 Pontiac indicating an issue with the right front turn signal circuit?

- Potential causes may include a faulty turn signal bulb, a damaged wiring harness, a defective turn signal switch, or a malfunctioning body control module.

3. How can I diagnose the right front turn signal circuit issue indicated by OBDII code B3949 Pontiac?

- You can start by visually inspecting the right front turn signal bulb for damage and checking the wiring connections for any signs of wear or corrosion. Using a multimeter to test continuity along the circuit can help pinpoint the problem.

4. What are some repair tips for addressing OBDII code B3949 Pontiac related to the right front turn signal circuit?

- Begin by replacing the right front turn signal bulb with a new one to see if that resolves the issue. If the problem persists, inspect and repair any damaged wiring or connectors. Consider testing and, if necessary, replacing the turn signal switch or body control module.

5. Can a DIY enthusiast fix OBDII code B3949 Pontiac affecting the right front turn signal circuit?

- Depending on their skill level and access to tools, a DIY enthusiast may be able to address this issue by following a systematic diagnostic approach and performing the necessary repairs or replacements.

6. Is it safe to continue driving with OBDII code B3949 Pontiac triggered by a malfunction in the right front turn signal circuit?

- It is not recommended to drive with a faulty turn signal as it compromises vehicle safety and may result in a citation. Promptly addressing the issue is advisable to ensure proper signaling while driving.

7. How do I reset OBDII code B3949 Pontiac once I have resolved the right front turn signal circuit problem?

- After fixing the underlying issue with the right front turn signal circuit, you can reset the OBDII code by using an OBDII scanner or disconnecting the vehicle's battery for a few minutes to clear the error code.

8. Are there any recalls or technical service bulletins related to OBDII code B3949 Pontiac and the right front turn signal circuit?

- Check with the manufacturer or authorized service centers to inquire about any recalls or technical service bulletins specific to OBDII code B3949 Pontiac and related issues with the right front turn signal circuit.

9. Will fixing OBDII code B3949 Pontiac affecting the right front turn signal circuit affect my vehicle's overall performance?

- Fixing this code should not have a direct impact on the overall performance of your vehicle but will ensure proper functioning of the right front turn signal, enhancing safety and compliance with road regulations.

10. How can I prevent issues with the right front turn signal circuit that trigger OBDII code B3949 Pontiac in the future?

- Regularly inspecting and maintaining your vehicle's turn signal system, including checking bulbs, wiring, and connectors, can help prevent issues that lead to OBDII code B3949 Pontiac and ensure proper signaling while driving.