C0301

Air Suspension Compressor Relay

Moderate severity

The air suspension control module has detected a fault in the compressor relay circuit. The compressor cannot be energized which prevents the system from refilling the air struts and ride height drops over time.

Common causes

Compressor relay failed
One of the most commonly reported causes for this code — check this first.
high
Typical part cost: $70-550
Relay wiring or fuse fault
A plausible cause — test and verify before replacing parts.
medium
Typical part cost: $70-550
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First things to check

1Confirm the code with a scan tool and check for additional related codes.
2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.

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Related codes

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Frequently asked questions

What does C0301 mean?

C0301 means "Air Suspension Compressor Relay". It is a generic OBD-II code that points to a fault in the chassis.

What are the most common causes of C0301?

compressor relay failed; relay wiring or fuse fault; internal module fault — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.

Can I keep driving with this code?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.

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