AutoCodesGeneric – B3951:01

B3951:01 Code - Right Rear Turn Signal Circuit Short to Battery

Quick Answer

Ground is applied at all times to the turn signal/multifunction switch. Common causes include Faulty Right Rear Turn Signal Lamp, Right Rear Turn Signal Lamp harness is open or shorted, Right 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
B3951:01 indicates Right Rear Turn Signal Circuit Short to Battery.
Common causes
Common causes include Faulty Right Rear Turn Signal Lamp, Right Rear Turn Signal Lamp harness is open or shorted, Right 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 334
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Jun 17, 2023
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Code B3951:01 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 in the right rear turn signal control circuit.
OBDII Code B3951:01 - Right Rear Turn Signal Circuit Short to Battery - AutoCodes.com
B3951:01 Code - Right Rear Turn Signal Circuit Short to Battery

What are the Possible Causes of the DTC B3951:01?

  • Faulty Right Rear Turn Signal Lamp
  • Right Rear Turn Signal Lamp harness is open or shorted
  • Right Rear Turn Signal Lamp circuit poor electrical connection

How to Fix the DTC B3951:01?

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.

Code Tech Notes

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3951:01 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 B3951:01 Code

1. What does the OBDII code B3951:01 mean?

It indicates a short to battery in the right rear turn signal circuit, causing improper functioning of the turn signal.

2. What are the symptoms of code B3951:01?

Symptoms include the right rear turn signal staying on constantly, not flashing, or failing to operate.

3. What causes the B3951:01 code?

Common causes include damaged wiring, a short circuit, a faulty turn signal bulb, or issues with the turn signal assembly.

4. Can a damaged bulb trigger the B3951:01 code?

Yes, a damaged or incorrect bulb can create a short to battery condition and trigger the code.

5. How do I diagnose the B3951:01 code?

Inspect the right rear turn signal wiring, bulb, and connector for damage, corrosion, or signs of a short circuit.

6. Can water intrusion cause the B3951:01 code?

Yes, water entering the turn signal assembly can damage wiring or connectors, leading to a short circuit.

7. How can I fix the B3951:01 code?

Repair or replace damaged wiring, connectors, or the turn signal bulb. Ensure all components are properly insulated.

8. Is the B3951:01 code dangerous to drive with?

Driving with a malfunctioning turn signal can be unsafe and illegal in many areas, as it compromises signaling to other drivers.

9. Does the B3951:01 code always require professional repair?

Not always. If the issue is a damaged bulb or connector, you can often resolve it yourself with basic tools and replacement parts.

10. Can clearing the B3951:01 code fix the problem?

Clearing the code without addressing the underlying issue won’t fix the problem. The code will likely return if the fault persists.

Discuss the causes and fixes for B3951:01 OBDII Code

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