OBD-II code · Chassis
C0301 Air Suspension Compressor Relay
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.
Is it safe to drive with C0301?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyCompressor relay failed
- PossibleRelay wiring or fuse fault
- Less likelyInternal module fault
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–2 h
- Emissions test
- Usually unaffected
- Parts involved
- Compressor Relay, Air Compressor, Air Suspension Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.