Code result
C0840
Air Suspension Solenoid Valve Circuit
Moderate severity
What it means
One of the level control solenoid valves reports an electrical fault. The corresponding axle cannot be levelled.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Solenoid coil open
highOne of the most commonly reported causes for this code — check this first.
Connector water damage
mediumA plausible cause — test and verify before replacing parts.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose C0840 freeNo credit card required