AutoCodes – GMC – C0662 GMC

C0662 GMC 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 GMC 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 1,059

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

What does this mean?

What are the Possible Causes of the DTC C0662 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 C0662 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 C0662 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 C0662 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 C0662 GMC Code

What does the OBDII code C0662 indicate for a GMC vehicle?

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

What are the common symptoms associated with the C0662 code?

Common symptoms include a warning light on the dashboard, an unresponsive or malfunctioning air suspension system, and poor ride quality.

What might cause the C0662 code to trigger in a GMC vehicle?

Possible causes include a faulty level control exhaust valve, damaged wiring or connectors, a malfunctioning air suspension control module, or a blown fuse in the circuit.

How can I diagnose the C0662 code?

To diagnose the C0662 code, check for any visible damage to the wiring and connectors, test the level control exhaust valve for proper operation, and inspect the air suspension control module and its connections.

What are some common repair tips for resolving the C0662 code?

Common repairs include replacing a faulty level control exhaust valve, repairing or replacing damaged wiring or connectors, and ensuring that all electrical connections are secure and free from corrosion.

Can I drive my vehicle with the C0662 code active?

While you can drive with the C0662 code present, it may lead to compromised ride quality and vehicle handling. Itâ€™s advisable to have it checked and repaired to restore proper function.

Is the C0662 code specific to GMC vehicles?

No, while the C0662 code is often associated with GMC vehicles, it can also appear in other makes and models that utilize a similar level control system.

How can I clear the C0662 code after repairs?

You can clear the C0662 code using an OBDII scanner to reset the trouble codes. However, ensure that the underlying issue has been properly addressed before clearing the code to avoid recurring problems.

What should I do if the C0662 code returns after repairs?

If the C0662 code returns after repairs, recheck all related components and wiring for faults, and consider consulting a professional mechanic for a thorough diagnosis.