AutoCodes – Generic – C0660

C0660 Code - Level Control Exhaust Valve Circuit Malfunction

Quick Answer

The automatic level control adjusts the vehicle suspension ride height. Common causes include Faulty Level Control Exhaust Valve, Level Control Exhaust Valve harness is open or shorted, Level Control Exhaust Valve 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: C0660 indicates Level Control Exhaust Valve Circuit Malfunction.
Common causes: Common causes include Faulty Level Control Exhaust Valve, Level Control Exhaust Valve harness is open or shorted, Level Control Exhaust Valve 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 22,231

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 Jul 31, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0660 Description

The automatic level control adjusts the vehicle suspension ride height. The Rear Integration Module (RIM) determines the height of the vehicle based on the voltage from the automatic level control sensor. The RIM raises and lowers the rear of the vehicle in order to keep the vehicle level.

OBDII Code C0660 - Level Control Exhaust Valve Circuit Malfunction - AutoCodes.com — C0660 Code - Level Control Exhaust Valve Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC C0660?

Faulty Level Control Exhaust Valve
Level Control Exhaust Valve harness is open or shorted
Level Control Exhaust Valve circuit poor electrical connection

How to Fix the DTC C0660?

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 C0660 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 C0660 code?

Need more information on how to fix the C0660 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0660 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C0660 Buick — Level Control Exhaust Valve Circuit Malfunction
C0660 Cadillac — Level Control Exhaust Valve Circuit Malfunction
C0660 Chevrolet — Level Control Exhaust Valve Circuit Malfunction
C0660 GMC — Level Control Exhaust Valve Circuit 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 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 wonâ€™t resolve the underlying issue. Proper diagnostics and repairs are necessary to prevent the code from returning.