AutoCodes – Generic – C0038

C0038 Code - Left Rear Wheel Speed Sensor Supply

Quick Answer

The Anti-Lock Brake System (ABS) Module monitors the Left Rear Wheel Speed Sensor. Common causes include Faulty Left Rear Wheel Speed Sensor, Left Rear Wheel Speed Sensor harness is open or shorted, Left Rear Wheel Speed Sensor 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: C0038 indicates Left Rear Wheel Speed Sensor Supply.
Common causes: Common causes include Faulty Left Rear Wheel Speed Sensor, Left Rear Wheel Speed Sensor harness is open or shorted, Left Rear Wheel Speed Sensor 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 7,509

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 May 02, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0038 Description

The Anti-Lock Brake System (ABS) Module monitors the Left Rear Wheel Speed Sensor. The ABS Module sets the OBDII code when the Left Rear Wheel Speed Sensor is not to factory specifications.

OBDII Code C0038 - Left Rear Wheel Speed Sensor Supply - AutoCodes.com — C0038 Code - Left Rear Wheel Speed Sensor Supply

What does this mean?

What are the Possible Causes of the DTC C0038?

Faulty Left Rear Wheel Speed Sensor
Left Rear Wheel Speed Sensor harness is open or shorted
Left Rear Wheel Speed Sensor circuit poor electrical connection

How to Fix the DTC C0038?

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 C0038 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 C0038 code?

Need more information on how to fix the C0038 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0038 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C0038 Subaru — Rear Left Pressure Reducing Valve Malfunction

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 C0038 Code

1. What are the common symptoms of OBDII code C0038 (Left Rear Wheel Speed Sensor Supply)?

A: Common symptoms include the ABS warning light being illuminated on the dashboard, traction control issues, and potential loss of stability control.

2. What are the possible causes of OBDII code C0038?

A: The code C0038 is typically triggered by a faulty left rear wheel speed sensor, damaged wiring or connectors, or issues with the ABS module.

3. How can I diagnose the cause of OBDII code C0038?

A: Diagnosing code C0038 involves using a scan tool to retrieve the code, inspecting the left rear wheel speed sensor and its connections, and testing the sensor's output using a multimeter.

4. Can I continue driving my vehicle with OBDII code C0038?

A: It is not recommended to drive your vehicle with OBDII code C0038 as it can affect the proper functioning of the ABS and stability control systems, compromising safety.

5. What is the typical repair for OBDII code C0038?

A: The typical repair involves replacing the left rear wheel speed sensor, repairing or replacing damaged wiring or connectors, and clearing the code with a scan tool.

6. Are there any DIY tips for fixing OBDII code C0038?

A: DIY tips include checking for loose or damaged wiring, ensuring proper sensor alignment during installation, and clearing the code after completing the repair.

7. How much does it cost to repair OBDII code C0038 at a mechanic?

A: The cost of repairing OBDII code C0038 at a mechanic can vary depending on the labor rates and whether other components need to be replaced. It can range from $100 to $300.

8. Will OBDII code C0038 affect my vehicle's performance?

A: OBDII code C0038 may affect the ABS and stability control systems, potentially compromising your vehicle's performance, especially in situations where traction and stability are crucial.

9. Can extreme weather conditions trigger OBDII code C0038?

A: Extreme weather conditions, such as excessive moisture or extreme cold, can sometimes lead to issues with wheel speed sensors and trigger OBDII code C0038.

10. How often should I check my wheel speed sensors to prevent OBDII code C0038?

A: It is recommended to include wheel speed sensor inspection as part of regular maintenance checks to prevent issues that could trigger OBDII code C0038.