AutoCodes – Generic – B3950:02

B3950:02 Code - Left Rear Turn Signal Circuit Short to Ground

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: B3950:02 indicates Left Rear Turn Signal Circuit Short to Ground.
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 240

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 B3950:02 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 ground in the left rear turn signal control circuit.

OBDII Code B3950:02 - Left Rear Turn Signal Circuit Short to Ground - AutoCodes.com — B3950:02 Code - Left Rear Turn Signal Circuit Short to Ground

What does this mean?

What are the Possible Causes of the DTC B3950:02?

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 B3950:02?

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 B3950:02 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 B3950:02 Code

1. What are the common symptoms of OBDII code B3950:02 (Left Rear Turn Signal Circuit Short to Ground)?

- Common symptoms include the left rear turn signal not working or staying on constantly, fast blinking of the turn signal, or a warning light on the dashboard.

2. What are the possible causes of OBDII code B3950:02?

- The code B3950:02 may be triggered by a short circuit in the wiring, a faulty turn signal bulb, a damaged turn signal socket, or a problem with the turn signal switch.

3. How can I diagnose the issue causing OBDII code B3950:02?

- You can start by visually inspecting the left rear turn signal wiring, socket, and bulb for any visible damage. Using a multimeter to test for continuity and shorts in the circuit can help pinpoint the issue.

4. Is it safe to drive with OBDII code B3950:02 active?

- It is not recommended to drive with the code B3950:02 active, as it can affect the signaling of your intentions to other drivers on the road, leading to potential safety hazards.

5. How can I repair OBDII code B3950:02 (Left Rear Turn Signal Circuit Short to Ground)?

- Repair options include repairing or replacing the damaged wiring, socket, or bulb, as well as addressing any issues with the turn signal switch if necessary.

6. Can a DIY enthusiast fix OBDII code B3950:02 at home?

- Depending on your skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair OBDII code B3950:02 at home. However, electrical issues can be complex, so professional help may be required.

7. Will resetting the OBDII system clear the B3950:02 code?

- Resetting the OBDII system may temporarily clear the B3950:02 code, but if the underlying issue causing the code is not fixed, it is likely to reappear once the system detects the problem again.

8. What is the typical cost to repair OBDII code B3950:02?

- The cost to repair OBDII code B3950:02 can vary depending on the cause of the issue, the extent of the damage, and whether you choose to DIY or seek professional help. Costs may range from a few dollars for a replacement bulb to more significant expenses for wiring repairs.

9. Can extreme weather conditions cause OBDII code B3950:02 to trigger?

- Yes, extreme weather conditions such as heavy rain, snow, or extreme temperatures can potentially damage the turn signal wiring or components, leading to a short circuit and triggering code B3950:02.

10. How often should I check my vehicle's turn signal system to prevent OBDII code B3950:02?

- It is recommended to periodically inspect your vehicle's turn signal system, including the wiring, sockets, and bulbs, as part of regular maintenance to catch any potential issues early and prevent OBDII code B3950:02 from occurring.