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Code C0604

Symptoms

• Warning light on the dashboard

• Uneven ride height

• Poor vehicle handling

Common Causes

• Faulty ride height sensor

• Damaged wiring or connectors

• Faulty suspension control module

Glossary

OBD-II: On-Board Diagnostics, a system that monitors vehicle performance.

Ride Height Sensor: A sensor that measures the distance between the vehicle's body and its wheels.

Related Codes

• C0605

• C0606

Laymans terms

This code means that there's a problem with one of the sensors in your car that helps it know how high or low it is off the ground. It's like when your toy car's wheels aren't all touching the floor properly.

Explanation

The C0604 code indicates a malfunction in the ride height sensor circuit.

Technical description

C0604 is a chassis code related to the ride height sensor circuit. This sensor is part of the vehicle's suspension system and is responsible for monitoring the height of the vehicle's body relative to its wheels. The code is triggered when the sensor circuit sends abnormal signals to the control module.

Diagnosis steps

• Perform a visual inspection of the ride height sensor and its wiring.

• Use a multimeter to test the sensor's electrical circuit for continuity.

• Check the suspension control module for any additional fault codes.

Repair procedures

• Replace the faulty ride height sensor.

• Repair or replace damaged wiring or connectors.

• Replace the suspension control module if necessary.

Tools required

• OBD-II scanner

• Multimeter

• Basic hand tools

Estimated repair cost

$150 - $500

Difficulty level

Moderate

Commonly affected vehicles

• Chevrolet Tahoe

• GMC Yukon

• Cadillac Escalade

Preventive measures

• Regularly inspect suspension components.

• Ensure proper maintenance of the vehicle's electrical system.

• Avoid overloading the vehicle.

Error code type

Sensor Issue

User experience recommendations

• Avoid driving on rough terrain until the issue is resolved.

• Consult a professional mechanic for a thorough inspection.

Warranty information

Check with the vehicle manufacturer for warranty coverage on suspension components.

Historical data

This code has been associated with vehicles that have advanced suspension systems, particularly in SUVs and trucks.

Urgency level

Moderate – It is recommended to address this issue soon to avoid further suspension problems.

Legal and safety notice

Driving with a malfunctioning suspension system can be unsafe. Ensure repairs are conducted by a qualified professional.

Testing conditions

• Vehicle parked on a level surface

• Ignition in the 'on' position

Component location

The ride height sensor is typically located near the suspension components, often attached to the control arms or the frame of the vehicle.

FAQs

Q: Can I drive with a C0604 code?
A: It's not recommended to drive with this code as it can affect vehicle handling and safety.

Q: How can I reset the C0604 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue persists, further diagnosis is needed.

Last updated: Feb 15, 2026 • Source: internal database
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