AutoCodes – Generic – C0140

C0140 Code - ABS CAN Communication Malfunction

Quick Answer

The Engine Control Module (ECM) monitors the ABS Control Module. Common causes include Faulty ABS Control Module, ABS Control Module harness is open or shorted, ABS Control Module 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: C0140 indicates ABS CAN Communication Malfunction.
Common causes: Common causes include Faulty ABS Control Module, ABS Control Module harness is open or shorted, ABS Control Module 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 6,609

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 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0140 Description

The Engine Control Module (ECM) monitors the ABS Control Module. The ECM sets the OBDII code when communication with the ABS Control Module fails.

OBDII Code C0140 - ABS CAN Communication Malfunction - AutoCodes.com — C0140 Code - ABS CAN Communication Malfunction

What does this mean?

What are the Possible Causes of the DTC C0140?

Faulty ABS Control Module
ABS Control Module harness is open or shorted
ABS Control Module circuit poor electrical connection

How to Fix the DTC C0140?

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 C0140 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 C0140 code?

Need more information on how to fix the C0140 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0140 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C0140 Subaru — ABS CAN Communication 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 C0140 Code

1. What are the common symptoms of OBDII code C0140 (ABS CAN Communication Malfunction)?

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

2. What are the possible causes of OBDII code C0140?

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

3. How can I diagnose the ABS CAN communication malfunction associated with code C0140?

- Diagnose by checking the condition of ABS sensors, inspecting wiring harnesses for damage, scanning the ABS module for fault codes, and testing the CAN communication network.

4. Is it safe to continue driving with OBDII code C0140 triggered?

- It is not recommended to drive with the ABS CAN communication malfunction as it can affect the vehicle's braking performance, especially in emergency situations.

5. Can a DIY enthusiast repair OBDII code C0140 at home?

- Repairing code C0140 may require advanced diagnostic tools and technical knowledge. DIY enthusiasts can check basic connections but should consult a professional for a thorough diagnosis and repair.

6. How much does it typically cost to repair OBDII code C0140?

- The cost of repairing code C0140 can vary depending on the underlying issue. It may range from a few hundred dollars for sensor replacements to over a thousand dollars for ABS module repairs.

7. Can a low battery voltage cause OBDII code C0140 to appear?

- Yes, low battery voltage can potentially disrupt the ABS CAN communication system and trigger code C0140. Ensuring a proper battery charge is a good initial troubleshooting step.

8. Will resetting the OBDII code C0140 clear the issue permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue is not fixed, the code is likely to reappear. Proper diagnosis and repair are essential for a permanent solution.

9. Are there any preventive maintenance steps to avoid OBDII code C0140 in the future?

- Regularly inspecting ABS sensors, maintaining the vehicle's electrical system, and addressing any warning lights promptly can help prevent the occurrence of ABS CAN communication malfunctions.

10. Can a malfunctioning ABS CAN communication system affect other vehicle systems?

- Yes, a malfunctioning ABS CAN communication system can impact other systems like traction control, stability control, and potentially the overall drivability of the vehicle.