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Engine-Codes – GMC – C0660 GMC

C0660 GMC Code - Level Control Exhaust Valve Circuit Malfunction

Quick Answer

The C0660 GMC code indicates a Level Control Exhaust Valve Circuit Malfunction. Common causes include Faulty exhaust valve, Wiring or electrical connection issues, Corrosion or damage to the circuit components. 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 GMC indicates Level Control Exhaust Valve Circuit Malfunction.
Common causes
Common causes include Faulty exhaust valve, Wiring or electrical connection issues, Corrosion or damage to the circuit components.
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 Aug 18, 2024
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Code C0660 GMC Description

The C0660 GMC code indicates a Level Control Exhaust Valve Circuit Malfunction. This means that there is a problem with the exhaust valve circuit in the vehicle's level control system. The level control system is responsible for adjusting the vehicle's suspension to maintain a consistent ride height, particularly when carrying heavy loads or towing.

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

Common Causes of C0660 GMC

  1. Faulty exhaust valve
  2. Wiring or electrical connection issues
  3. Corrosion or damage to the circuit components
  4. Malfunctioning level control module
  5. Software issues or calibration errors

Symptoms of C0660 GMC

  1. Uneven ride height
  2. Suspension issues (e.g., bouncing or bottoming out)
  3. Illuminated warning lights on the dashboard
  4. Poor handling or steering response
  5. Abnormal noises coming from the suspension system

How to Fix C0660 GMC

  1. Perform a diagnostic scan to confirm the C0660 code and identify the specific cause of the malfunction.
  2. Inspect the exhaust valve circuit, wiring, and connections for any damage or corrosion.
  3. Test the level control module and other related components for proper functioning.
  4. Replace any faulty exhaust valve or repair damaged wiring as needed.
  5. Clear the diagnostic trouble codes and reset the system to ensure proper operation.

Cost to Fix C0660 GMC

The typical repair costs for addressing a Level Control Exhaust Valve Circuit Malfunction can vary depending on the extent of the issue and the specific components that need to be replaced or repaired. On average, the repair for this code may range from $200 to $500, including parts and labor. However, it's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's recommended to obtain local estimates for a more accurate cost assessment.

What does this mean?

Tech Notes for C0660 GMC





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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 GMC Code

What does the OBDII code C0660 mean for GMC vehicles?

C0660 refers to a malfunction in the Level Control Exhaust Valve Circuit, which is part of the air suspension system that controls the vehicle's ride height.

What symptoms might indicate a C0660 code?

Common symptoms include a warning light on the dashboard, a rough or uneven ride, the vehicle sitting lower than normal, or an inoperative air suspension system.

What are some common causes of the C0660 code?

Causes may include a faulty level control exhaust valve, damaged wiring or connectors in the circuit, a blown fuse, or issues with the air suspension control module.

How can I diagnose the C0660 code accurately?

Use an OBDII scanner to confirm the code, then visually inspect the wiring and connectors for damage. Perform tests on the level control exhaust valve to check for proper operation.

What repairs might be needed to fix a C0660 code?

Repairs may involve replacing the level control exhaust valve, repairing or replacing damaged wiring or connectors, or replacing the air suspension control module if it is faulty.

Can I clear the C0660 code without fixing the problem?

Yes, you can clear the code with an OBDII scanner, but if the underlying issue is not resolved, the code will likely return.

Is it safe to drive a vehicle with a C0660 code?

While it may still be driveable, the vehicle may have an impaired suspension system, which can affect handling and safety, so it's best to address the issue promptly.

Will a C0660 code affect my vehicle's performance?

Yes, it can lead to an uneven ride height and may cause handling problems, reducing overall vehicle performance and comfort.

What is the average cost to repair a C0660 code?

Repair costs can vary widely depending on the cause but may range from $100 for simple wiring repairs to over $500 for replacing the level control valve or module.

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