OBD-II code · Chassis
C0840 Air Suspension Solenoid Valve Circuit
One of the level control solenoid valves reports an electrical fault. The corresponding axle cannot be levelled.
Is it safe to drive with C0840?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySolenoid coil open
- PossibleConnector water damage
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
- Best left to a mechanic
- Typical labour
- 1–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Air Suspension Valve, Air Suspension Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.