AutoCodes – GMC – C0663 GMC

C0663 GMC Code - Level Control Exhaust Valve Circuit High

Quick Answer

The Automatic Level Control exhaust solenoid valve is switched ON or OFF by the Electronic Suspension Control (ESC) module. 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: C0663 GMC indicates Level Control Exhaust Valve Circuit High.
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 961

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 C0663 GMC Description

The Automatic Level Control exhaust solenoid valve is switched ON or OFF by the Electronic Suspension Control (ESC) module. The ESC module provides a ground whenever exhaust activity is required and during a head-relief sequence which occurs before each compressor start-up. This drive output from the ESC module is continually monitored to determine if the voltage level agrees with the commanded state.

OBDII Code C0663 GMC - Level Control Exhaust Valve Circuit High - AutoCodes.com — C0663 GMC Code - Level Control Exhaust Valve Circuit High

What does this mean?

What are the Possible Causes of the DTC C0663 GMC?

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 C0663 GMC?

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 C0663 GMC 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 C0663 GMC code?

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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.