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Code C0664

Symptoms

• Uneven ride height

• Poor ride quality

• Warning light on the dashboard

Common Causes

• Faulty ride height sensor

• Damaged air suspension components

• Wiring or connector issues

Glossary

Ride Height Sensor: A device that measures the height of the vehicle's body relative to its wheels.

Air Suspension: A type of vehicle suspension powered by an electric or engine-driven air pump or compressor.

Related Codes

• C0665

• C0666

Laymans terms

This code means that the car's computer has found a problem with the level control system, which helps keep the car balanced and comfortable while driving.

Explanation

The C0664 code indicates an issue with the level control system, often related to the air suspension or ride height sensors.

Technical description

C0664 is a chassis code that refers to a malfunction in the vehicle's level control system, which is responsible for maintaining the proper ride height and balance of the vehicle. This system may involve components such as air suspension, sensors, and control modules.

Diagnosis steps

• Check for any visible damage to the suspension components.

• Inspect the wiring and connectors related to the level control system.

• Use a diagnostic scanner to read and clear codes, then test the system.

Repair procedures

• Replace the faulty ride height sensor.

• Repair or replace damaged air suspension parts.

• Fix any wiring or connector issues.

Tools required

• OBD-II scanner

• Multimeter

• Basic hand tools

Estimated repair cost

$200 - $600

Difficulty level

Moderate

Commonly affected vehicles

• Chevrolet Suburban

• GMC Yukon

• Cadillac Escalade

Preventive measures

• Regularly inspect suspension components.

• Keep the vehicle's undercarriage clean.

• Avoid overloading the vehicle.

Error code type

Chassis Control System Issue

User experience recommendations

• Have the suspension system checked regularly.

• Be cautious when driving on uneven terrain.

Warranty information

Check with your vehicle manufacturer for specific warranty coverage on suspension components.

Historical data

C0664 has been a common issue in vehicles with air suspension systems, particularly in older models.

Urgency level

Moderate – This issue affects ride quality and vehicle handling, so it should be addressed soon.

Legal and safety notice

Driving with a malfunctioning suspension system can be unsafe, particularly at high speeds or on rough roads.

Testing conditions

• Vehicle parked on a level surface

• Engine running

Component location

The ride height sensor is typically located near the vehicle's suspension components, often near the wheels.

FAQs

Q: Can I drive with a C0664 code?
A: It's possible to drive, but it's not recommended as it can affect the vehicle's stability and comfort.

Q: How do I reset the C0664 code?
A: You can reset the code with an OBD-II scanner, but it's important to fix the underlying issue first.

Last updated: Mar 2, 2026 • Source: internal database
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