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C0663 GMC Code - Level Control Exhaust Valve Circuit High

Quick Answer

The C0663 GMC code indicates a problem with the Level Control Exhaust Valve Circuit being too high. Common causes include Faulty level control exhaust valve, Damaged wiring or connectors in the circuit, Malfunctioning control module. 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
C0663 GMC indicates Level Control Exhaust Valve Circuit High.
Common causes
Common causes include Faulty level control exhaust valve, Damaged wiring or connectors in the circuit, Malfunctioning control module.
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 17, 2024
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Code C0663 GMC Description

The C0663 GMC code indicates a problem with the Level Control Exhaust Valve Circuit being too high. This system is part of the vehicle's suspension system, specifically the air suspension system. The level control exhaust valve is responsible for regulating the air pressure in the suspension system to maintain the vehicle's ride height and stability. When this circuit is reading high, it means that there is an issue with the valve not functioning properly, which can lead to an imbalance in the suspension system.

OBDII Code C0663 GMC - Level Control Exhaust Valve Circuit High
C0663 GMC Code - Level Control Exhaust Valve Circuit High

Common Causes of C0663 GMC

  1. Faulty level control exhaust valve
  2. Damaged wiring or connectors in the circuit
  3. Malfunctioning control module
  4. Issues with the air suspension system components
  5. Corrosion or moisture in the system affecting electrical connections

Symptoms of C0663 GMC

  1. Uneven ride height
  2. Excessive bouncing or dipping when driving over bumps
  3. Vehicle leaning to one side
  4. Harsh or rough ride quality
  5. Illumination of the suspension warning light on the dashboard

How to Fix C0663 GMC

  1. Begin by conducting a thorough inspection of the level control exhaust valve, wiring, connectors, and control module to identify any visible damage or issues.
  2. Test the circuit using a multimeter to check for proper voltage and continuity, focusing on the exhaust valve and related components.
  3. Replace any damaged or faulty parts, such as the level control exhaust valve, wiring harness, connectors, or control module.
  4. Clear the diagnostic trouble codes from the vehicle's system using a scan tool and test drive the vehicle to ensure the issue has been resolved.
  5. Perform a final calibration of the suspension system to ensure proper operation and ride height adjustment.

Cost to Fix C0663 GMC

The typical repair costs for addressing a Level Control Exhaust Valve Circuit High code can vary depending on the specific cause of the issue and the parts required for repair. In general, the cost of parts for this repair can range from $100 to $300, while labor costs can range from $150 to $400. Overall, the total cost of repairing this issue may fall between $250 and $700. It's important to note that these are rough estimates, and actual costs may vary based on factors such as location, vehicle make and model, and labor rates at auto repair shops. It's recommended to obtain quotes from local shops to get a more accurate cost estimate for this repair.

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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 C0663 GMC Code

1. What are common symptoms of OBDII code C0663 in a GMC related to the Level Control Exhaust Valve Circuit High?

- Common symptoms include issues with the vehicle's suspension system, such as uneven ride height and difficulty maintaining a level ride.

2. What are the potential causes of OBDII code C0663 in a GMC?

- The code C0663 is often triggered by faults in the exhaust valve circuit, such as a malfunctioning exhaust valve or wiring issues.

3. How can I diagnose the Level Control Exhaust Valve Circuit High issue in my GMC?

- Diagnosing this issue may involve using an OBDII scanner to read the specific error code, inspecting the exhaust valve and related wiring, and testing the circuit for continuity.

4. What are some tips for repairing OBDII code C0663 in a GMC?

- Repairing this code may involve replacing a faulty exhaust valve, repairing damaged wiring, or resetting the system after fixing the underlying issue.

5. Can driving with OBDII code C0663 in a GMC cause further damage?

- While driving with this code may not cause immediate harm, it is recommended to address the underlying issue promptly to prevent potential suspension system problems.

6. How much does it typically cost to repair OBDII code C0663 in a GMC?

- The cost of repairing this code can vary based on the specific cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

7. Is it safe to continue driving my GMC with the Level Control Exhaust Valve Circuit High issue?

- While the vehicle may still be operable with this issue, it is advisable to have it inspected and repaired to ensure optimal performance and safety.

8. Can I reset the OBDII code C0663 in my GMC without repairing the underlying problem?

- While you can clear the error code temporarily, it is important to address the root cause of the issue to prevent the code from reappearing.

9. Are there any DIY repairs I can attempt for OBDII code C0663 in my GMC?

- DIY repairs for this code may include checking and cleaning the exhaust valve connections, inspecting for visible wiring issues, and resetting the system to see if the code clears.

10. How long does it take to repair OBDII code C0663 in a GMC?

- The repair time for this code can vary depending on the exact cause of the issue and the complexity of the repair, but it may take a few hours to a day to complete the necessary fixes.

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