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C0840 Chassis

Air Suspension Solenoid Valve Circuit

One of the level control solenoid valves reports an electrical fault. The corresponding axle cannot be levelled.

Affected components

  • Air suspension valve
  • Air suspension module

Common causes

  • High likelihood: Solenoid coil open
  • Medium likelihood: Connector water damage

Possible symptoms

  • ABS warning light on
  • ESC/stability control deactivated
  • Possible reduced brake assist
  • Speedometer may behave erratically

Sources

Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.

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