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.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: medium
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Common causes
Ordered by how often each turns out to be the cause.
- Compressor relay failed (stuck or open)Common
- Compressor motor shorted, dragging supply downPossible
- Relay wiring or connector faultLess likely
Parts involved
- Compressor Relay
- Air Compressor
- Air Suspension Module
- Relay Wiring
C0317 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.