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C0140 Subaru Code - ABS CAN Communication Malfunction

Quick Answer

The C0140 code for Subaru vehicles indicates an ABS CAN communication malfunction. Common causes include Faulty ABS module, Wiring issues or damaged connectors in the CAN communication network, Corrosion or water damage in the ABS control module. 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
C0140 Subaru indicates ABS CAN Communication Malfunction.
Common causes
Common causes include Faulty ABS module, Wiring issues or damaged connectors in the CAN communication network, Corrosion or water damage in the ABS control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 05, 2024
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Code C0140 Subaru Description

The C0140 code for Subaru vehicles indicates an ABS CAN communication malfunction. This means that there is an issue with the communication network between the Anti-lock Braking System (ABS) module and other control modules in the vehicle. The ABS system relies on communication with other systems to function properly, so a malfunction in this communication can lead to ABS system failure. This can affect the vehicle's braking performance, stability control, and overall safety.

OBDII Code C0140 Subaru - ABS CAN Communication Malfunction
C0140 Subaru Code - ABS CAN Communication Malfunction

Common Causes of C0140 Subaru

  1. Faulty ABS module
  2. Wiring issues or damaged connectors in the CAN communication network
  3. Corrosion or water damage in the ABS control module
  4. Software glitches or programming errors
  5. Electrical interference from other components in the vehicle

Symptoms of C0140 Subaru

  1. ABS warning light illuminated on the dashboard
  2. Loss of ABS functionality
  3. Traction control system not working properly
  4. Brake pedal feels spongy or unresponsive
  5. Strange noises coming from the ABS system during braking

How to Fix C0140 Subaru

  1. Begin by performing a thorough inspection of the ABS module, wiring, and connectors for any visible damage or corrosion.
  2. Use a diagnostic scan tool to retrieve the trouble codes and pinpoint the exact location of the communication malfunction.
  3. Test the CAN communication network for continuity and proper voltage levels.
  4. Replace any damaged wiring or connectors, and repair any corroded connections.
  5. If necessary, replace the ABS module with a new one and reprogram it to ensure proper communication with other vehicle systems.

Cost to Fix C0140 Subaru

The cost of repairing an ABS CAN communication malfunction can vary depending on the extent of the issue and the specific repairs needed. On average, the cost can range from $200 to $800, including parts and labor. Keep in mind that diagnostic time and labor rates can impact the final cost, so it's recommended to consult with a professional mechanic for a more accurate estimate.

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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 C0140 Subaru Code

1. What are common symptoms of OBDII code C0140 in a Subaru indicating ABS CAN Communication Malfunction?

- Common symptoms include the ABS warning light illuminating on the dashboard, loss of ABS functionality, and potential traction control system issues.

2. What could cause the ABS CAN Communication Malfunction (code C0140) in a Subaru?

- Possible causes include damaged ABS wheel speed sensors, faulty ABS module, wiring issues, or a malfunctioning CAN communication network.

3. How can I diagnose the ABS CAN Communication Malfunction in my Subaru?

- You can diagnose the issue using an OBDII scanner to retrieve the specific trouble code (C0140) and then inspect the ABS sensors, wiring connections, and CAN network for any visible damage or faults.

4. Is it safe to drive my Subaru with OBDII code C0140 indicating ABS CAN Communication Malfunction?

- It is not recommended to drive the vehicle with this code as it can compromise the effectiveness of the ABS system, potentially leading to unsafe driving conditions.

5. Can I reset the OBDII code C0140 related to ABS CAN Communication Malfunction in my Subaru?

- While you can clear the trouble code with an OBDII scanner, it is crucial to address the underlying issue causing the malfunction to prevent the code from reoccurring.

6. How can I repair the ABS CAN Communication Malfunction in my Subaru?

- Repair options may include replacing damaged ABS wheel speed sensors, repairing faulty wiring connections, diagnosing and fixing CAN communication network issues, or replacing the ABS module if necessary.

7. Are there any DIY tips for troubleshooting OBDII code C0140 in a Subaru?

- DIY tips include visually inspecting ABS sensors and wiring for damage, checking for loose connections, and ensuring proper CAN communication network functionality.

8. Can a weak battery or alternator cause OBDII code C0140 in a Subaru related to ABS CAN Communication Malfunction?

- Yes, a weak battery or alternator can potentially cause electrical issues that may trigger the ABS CAN Communication Malfunction code (C0140) in your Subaru.

9. How much does it typically cost to repair OBDII code C0140 for ABS CAN Communication Malfunction in a Subaru?

- Repair costs can vary depending on the exact cause of the issue, but they may range from $200 to $800, including parts and labor.

10. Will ignoring OBDII code C0140 in a Subaru lead to further damage or safety hazards?

- Ignoring the ABS CAN Communication Malfunction code (C0140) can result in compromised ABS functionality, reduced vehicle stability, and potentially unsafe driving conditions, so it is important to address the issue promptly.

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