AutoCodes – Generic – C0663

C0663 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 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 5,149

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

What does this mean?

What are the Possible Causes of the DTC C0663?

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?

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 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 code?

Need more information on how to fix the C0663 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0663 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C0663 Buick — Level Control Exhaust Valve Circuit High
C0663 Cadillac — Level Control Exhaust Valve Circuit High
C0663 Chevrolet — Level Control Exhaust Valve Circuit High
C0663 GMC — Level Control Exhaust Valve Circuit High

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 Code

1. What are the common symptoms of OBDII code C0663 (Level Control Exhaust Valve Circuit High)?

- Common symptoms include issues with the vehicle's suspension system, uneven ride height, and potential warning lights on the dashboard.

2. What can cause the OBDII code C0663 to trigger?

- The code C0663 can be triggered by a faulty level control exhaust valve, damaged wiring or connectors in the circuit, or a malfunction in the suspension control module.

3. How can I diagnose the cause of OBDII code C0663?

- To diagnose the cause of code C0663, it is recommended to perform a thorough inspection of the level control exhaust valve, circuit wiring, and connectors. Using a diagnostic scan tool can help pinpoint the issue.

4. Is it safe to drive with OBDII code C0663 present?

- It is not recommended to drive with OBDII code C0663 present, as it can affect the vehicle's suspension system and overall ride quality. It is best to address the issue promptly.

5. Can OBDII code C0663 be repaired at home?

- Repairing OBDII code C0663 may require specialized tools and knowledge of the vehicle's suspension system. It is recommended to consult a professional mechanic for proper diagnosis and repair.

6. What are some possible DIY repair tips for OBDII code C0663?

- DIY repair tips for code C0663 may include checking and cleaning the connectors in the circuit, inspecting for any visible damage to the wiring, and ensuring proper connection to the suspension control module.

7. How much does it typically cost to repair OBDII code C0663?

- The cost of repairing OBDII code C0663 can vary depending on the root cause of the issue. It is advisable to obtain a diagnosis from a mechanic to determine the exact cost of repair.

8. Can resetting the OBDII system clear code C0663?

- Resetting the OBDII system may temporarily clear code C0663, but if the underlying issue is not addressed, the code is likely to reappear. It is important to diagnose and repair the root cause of the problem.

9. Will OBDII code C0663 affect the vehicle's performance?

- OBDII code C0663 may affect the vehicle's suspension system and ride quality, potentially leading to a decrease in performance and handling. Prompt diagnosis and repair are recommended.

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

- The repair time for OBDII code C0663 can vary depending on the complexity of the issue and the availability of parts. It is advisable to consult with a professional mechanic for an accurate estimate of repair time.