AutoCodes – Subaru – C0231 Subaru

C0231 Subaru Code - Engine Control Module Failure

Quick Answer

The Anti-Lock Brake System (ABS) Module monitors the Engine Control Module (ECM) signal. Common causes include Faulty Engine Control Module (ECM), Engine Control Module (ECM) harness is open or shorted, Engine Control Module (ECM) 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: C0231 Subaru indicates Engine Control Module Failure.
Common causes: Common causes include Faulty Engine Control Module (ECM), Engine Control Module (ECM) harness is open or shorted, Engine Control Module (ECM) 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 33,002

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 Jun 01, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0231 Subaru Description

The Anti-Lock Brake System (ABS) Module monitors the Engine Control Module (ECM) signal. The ABS Module sets the OBDII code when the ECM signal is not to factory specifications.

OBDII Code C0231 Subaru - Engine Control Module Failure - AutoCodes.com — C0231 Subaru Code - Engine Control Module Failure

What does this mean?

What are the Possible Causes of the DTC C0231 Subaru?

Faulty Engine Control Module (ECM)
Engine Control Module (ECM) harness is open or shorted
Engine Control Module (ECM) circuit poor electrical connection

How to Fix the DTC C0231 Subaru?

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 C0231 Subaru 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 C0231 Subaru code?

Need more information on how to fix the C0231 Subaru code? Get Access to Factory Service Manuals

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Get the C0231 Subaru code diagnosed by a professional: Find a repair shop in your area

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 C0231 Subaru Code

1. What are the common symptoms of OBDII code C0231 in a Subaru related to Engine Control Module failure?

- Common symptoms include engine stalling, rough idling, poor acceleration, and the illumination of the check engine light.

2. What can cause the OBDII code C0231 in a Subaru indicating Engine Control Module failure?

- The code C0231 can be triggered by a faulty Engine Control Module, wiring issues, or a poor connection between the ECM and other components.

3. How can I diagnose the OBDII code C0231 in my Subaru related to Engine Control Module failure?

- Diagnosing this code typically involves using an OBDII scanner to read the code, checking for any other related codes, and performing a thorough inspection of the ECM and its connections.

4. Can a DIY enthusiast repair the Engine Control Module failure causing OBDII code C0231 in a Subaru?

- Repairing or replacing the Engine Control Module usually requires specialized tools and expertise, so it is recommended to consult a professional mechanic or dealership for proper diagnosis and repair.

5. Is it safe to drive my Subaru with the OBDII code C0231 indicating Engine Control Module failure?

- It is not recommended to drive your Subaru with the C0231 code as it can lead to further damage to the engine or other components. Immediate attention from a mechanic is advised.

6. How much does it cost to repair the Engine Control Module failure causing OBDII code C0231 in a Subaru?

- The cost of repairing or replacing the Engine Control Module can vary depending on the extent of the damage, the model of the Subaru, and labor costs. It is best to obtain quotes from different repair shops.

7. Can resetting the OBDII code C0231 in my Subaru temporarily resolve the issue related to Engine Control Module failure?

- Resetting the code may temporarily turn off the check engine light, but it will not fix the underlying issue causing the code. It is essential to address the root cause of the problem.

8. Are there any preventive maintenance tips to avoid OBDII code C0231 related to Engine Control Module failure in a Subaru?

- Regular maintenance, such as checking and cleaning connections, ensuring proper wiring, and promptly addressing any warning signs, can help prevent issues leading to the C0231 code.

9. Can a weak battery or alternator cause the OBDII code C0231 in a Subaru indicating Engine Control Module failure?

- A weak battery or alternator can sometimes cause electrical issues that may lead to the C0231 code. It is advisable to have the battery and charging system checked as part of the diagnostic process.

10. How long does it take to repair the Engine Control Module failure causing OBDII code C0231 in a Subaru?

- The repair time can vary depending on the extent of the issue, availability of parts, and the mechanic's workload. It is best to consult with the repair shop for an estimated timeframe.