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Engine-Codes – Generic – C0660

C0660 Code - Level Control Exhaust Valve Circuit Malfunction

Quick Answer

The C0660 diagnostic trouble code (DTC) indicates a Level Control Exhaust Valve Circuit Malfunction. Common causes include Faulty exhaust valve: The exhaust valve itself may be malfunctioning, either due to wear and tear or electrical issues, Wiring issues: Damaged or corroded wiring in the circuit can disrupt the flow of electrical signals to the exhaust valve, Connector problems: Loose or damaged connectors connecting the control module to the exhaust valve can cause communication issues. 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
C0660 indicates Level Control Exhaust Valve Circuit Malfunction.
Common causes
Common causes include Faulty exhaust valve: The exhaust valve itself may be malfunctioning, either due to wear and tear or electrical issues, Wiring issues: Damaged or corroded wiring in the circuit can disrupt the flow of electrical signals to the exhaust valve, Connector problems: Loose or damaged connectors connecting the control module to the exhaust valve can cause communication issues.
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 09, 2024
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Code C0660 Description

The C0660 diagnostic trouble code (DTC) indicates a Level Control Exhaust Valve Circuit Malfunction. In vehicles equipped with air suspension systems, the level control exhaust valve plays a crucial role in controlling the ride height of the vehicle. The valve is responsible for releasing air from the suspension system to adjust the vehicle's height based on the load it is carrying or to compensate for road conditions.

OBDII Code C0660 - Level Control Exhaust Valve Circuit Malfunction
C0660 Code - Level Control Exhaust Valve Circuit Malfunction

Common Causes of C0660

  1. Faulty exhaust valve: The exhaust valve itself may be malfunctioning, either due to wear and tear or electrical issues.
  2. Wiring issues: Damaged or corroded wiring in the circuit can disrupt the flow of electrical signals to the exhaust valve.
  3. Connector problems: Loose or damaged connectors connecting the control module to the exhaust valve can cause communication issues.
  4. Control module failure: A malfunctioning control module can also trigger the C0660 DTC, preventing proper communication with the exhaust valve.
  5. Environmental factors: Exposure to moisture, dirt, or debris can affect the components of the exhaust valve circuit, leading to malfunctions.

Symptoms of C0660

  1. Uneven ride height: The vehicle may exhibit uneven ride height, with one side sitting lower or higher than the other.
  2. Harsh ride quality: The suspension system may feel stiff or bumpy, affecting the overall comfort of the ride.
  3. Handling issues: The vehicle may experience poor handling, such as increased body roll or instability during turns.
  4. Suspension warning light: The suspension warning light on the dashboard may illuminate, indicating a problem with the system.
  5. Abnormal noises: Strange noises, such as clunking or squeaking, may be heard coming from the suspension system.

How to Fix C0660

  1. Diagnostic scan: Begin by using a diagnostic scan tool to retrieve the specific DTC and identify the root cause of the issue.
  2. Visual inspection: Inspect the wiring, connectors, and exhaust valve for any visible damage or corrosion that may be causing the malfunction.
  3. Repair or replace components: Depending on the findings, repair or replace any damaged wiring, connectors, or the exhaust valve itself.
  4. Clear DTC: After completing the repairs, clear the DTC from the vehicle's memory using the diagnostic scan tool.
  5. Test drive: Take the vehicle for a test drive to ensure that the suspension system is functioning properly and that the issue has been resolved.

Cost to Fix C0660

The cost of repairing a Level Control Exhaust Valve Circuit Malfunction can vary depending on the extent of the damage and the specific components that need to be repaired or replaced. On average, the parts for this repair can range from $100 to $300, with labor costs adding an additional $100 to $200. This brings the total repair cost to approximately $200 to $500. However, it's important to note that labor rates and parts prices can vary based on the location of the repair shop, the make and model of the vehicle, and the extent of the repairs needed. It's recommended to obtain a detailed quote from a trusted auto repair shop to get an accurate estimate for this repair.

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Code C0660 Information for Specific Makes

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 C0660 Code

1. What does OBDII code C0660 mean?

C0660 indicates a malfunction in the level control exhaust valve circuit, which is part of the air suspension system that regulates vehicle height.

2. What are the common symptoms of code C0660?

Symptoms include a sagging or uneven suspension, a stiff or rough ride, and possibly an illuminated suspension system warning light.

3. What causes the C0660 code to appear?

Common causes include a faulty exhaust valve, damaged wiring or electrical connections, a malfunctioning air suspension compressor, or a blown fuse.

4. Can I drive with the C0660 code active?

While the vehicle may still be drivable, ignoring this code can lead to further suspension issues and compromise ride comfort and safety.

5. How do I diagnose code C0660?

Start by inspecting the level control exhaust valve, wiring, and connectors for damage or corrosion. Use a multimeter to test the circuit for proper voltage.

6. What repairs can fix the C0660 code?

Repairs may include replacing the faulty exhaust valve, repairing or replacing damaged wiring, cleaning corroded connectors, or replacing a blown fuse.

7. Is the air suspension compressor always the issue with code C0660?

No, the compressor is not always the issue. The problem is often specific to the exhaust valve circuit or related wiring.

8. How much does it cost to fix code C0660?

Repair costs vary but may range from $100 to $500, depending on whether the issue is a simple wiring repair or requires component replacement.

9. Can a DIYer fix the C0660 code?

If you have basic automotive knowledge and tools, you can attempt repairs like checking wiring or replacing the exhaust valve. However, advanced diagnostics may require a professional.

10. Will clearing the C0660 code with a scanner fix the problem?

Clearing the code may temporarily turn off the warning, but it won’t resolve the underlying issue. Proper diagnostics and repairs are necessary to prevent the code from returning.

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