OBD-II code · Chassis
C0317 Compressor Relay Circuit
The air suspension control module has detected a circuit fault on the compressor relay output — typically open circuit, short to ground or short to power. Self-levelling is disabled and the vehicle may sit lower than normal.
Is it safe to drive with C0317?
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 (stuck or open)
- PossibleCompressor motor shorted, dragging supply down
- Less likelyRelay wiring or connector 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
- 0.5–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Compressor Relay, Air Compressor, Air Suspension Module, Relay Wiring
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.