AutoCodes – Generic – C0662

C0662 Code - Level Control Exhaust Valve Circuit Low

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: C0662 indicates Level Control Exhaust Valve Circuit Low.
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 1,877

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 C0662 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 C0662 - Level Control Exhaust Valve Circuit Low - AutoCodes.com — C0662 Code - Level Control Exhaust Valve Circuit Low

What does this mean?

What are the Possible Causes of the DTC C0662?

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 C0662?

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 C0662 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 C0662 code?

Need more information on how to fix the C0662 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0662 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C0662 Buick — Level Control Exhaust Valve Circuit Low
C0662 Cadillac — Level Control Exhaust Valve Circuit Low
C0662 Chevrolet — Level Control Exhaust Valve Circuit Low
C0662 GMC — Level Control Exhaust Valve Circuit Low

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 C0662 Code

1. What does the OBDII code C0662 mean?

C0662 indicates a problem with the Level Control Exhaust Valve Circuit, specifically that the circuit voltage is lower than expected.

2. What are the common symptoms of code C0662?

Common symptoms include a warning light on the dash, issues with the air suspension not adjusting properly, and a possible rough or uneven ride.

3. What causes the C0662 code to appear?

This code is typically caused by a faulty exhaust valve, damaged wiring or connectors in the circuit, or a malfunctioning air suspension control module.

4. Can a blown fuse trigger the C0662 code?

Yes, if the fuse associated with the level control exhaust valve circuit is blown, it can cause the circuit to have low voltage and trigger this code.

5. How do I diagnose the C0662 code?

Start by checking the wiring and connectors for damage or corrosion, test the exhaust valve for proper operation, and verify the fuse is intact. A scan tool can also be used to monitor the control module signals.

6. Is it safe to drive with the C0662 code?

While it may be safe to drive short distances, ignoring the issue can lead to further suspension problems and compromised ride quality.

7. How is the C0662 code repaired?

Repairs may include replacing the exhaust valve, fixing damaged wiring, cleaning corroded connectors, or replacing the air suspension control module if needed.

8. Can I clear the C0662 code without fixing the problem?

Clearing the code without addressing the root cause will likely result in the code returning, as the underlying issue remains unresolved.

9. What tools are needed to fix the C0662 code?

You'll need a digital multimeter to test the circuit, a scan tool to read and clear codes, and basic hand tools to access and inspect components.

10. How much does it cost to fix the C0662 code?

Repair costs vary depending on the issue. Wiring repairs may cost around $50-$100, while replacing the exhaust valve or control module can range from $200 to $800, including labor.