AutoCodes – Cadillac – C0660 Cadillac

C0660 Cadillac 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 Cadillac 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 10,986

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

What does this mean?

What are the Possible Causes of the DTC C0660 Cadillac?

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 Cadillac?

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 Cadillac 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.

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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 C0660 Cadillac Code

1. What does the OBDII code C0660 on a Cadillac mean?

C0660 indicates a malfunction in the level control exhaust valve circuit, which is part of the air suspension system responsible for adjusting the vehicleâ€™s ride height.

2. What are the common symptoms of a C0660 code on a Cadillac?

Symptoms include uneven ride height, a sagging suspension, warning lights on the dashboard, and unusual noises from the air suspension system.

3. What causes the C0660 code on a Cadillac?

Common causes include a faulty exhaust valve, damaged wiring or connectors in the level control circuit, a malfunctioning air suspension compressor, or a blown fuse.

4. Can I drive my Cadillac with a C0660 code?

While the vehicle may still be drivable, ignoring the issue can lead to further suspension damage and reduced handling performance, so itâ€™s best to address it promptly.

5. How is the C0660 code diagnosed?

A technician will use a scan tool to confirm the code, inspect the wiring and connectors for damage, test the exhaust valve for proper operation, and check the air suspension compressor.

6. How do you fix a C0660 code on a Cadillac?

Repairs may involve replacing the exhaust valve, repairing or replacing damaged wiring or connectors, or replacing the air suspension compressor if itâ€™s faulty.

7. How much does it cost to repair the C0660 code on a Cadillac?

Repair costs vary but typically range from $200 to $800, depending on whether itâ€™s a wiring issue, valve replacement, or a compressor problem.

8. Can a faulty exhaust valve cause other codes to appear?

Yes, a malfunctioning exhaust valve can trigger related suspension codes, such as those for the air compressor or pressure sensor.

9. How do I prevent the C0660 code from recurring?

Regularly inspect the air suspension components, keep the system free from dirt or debris, and address any suspension issues promptly to avoid further damage.

10. Is the C0660 code specific to Cadillac vehicles?

While the code can appear on other vehicles with air suspension systems, it is commonly associated with Cadillac models equipped with electronic level control.