C1540 Code: Meaning, Causes, and Symptoms | OBD2 Codes
C1540 – Air Suspension Left Rear Ride Height Level Control
C1540 Possible Symptoms
Anti-Lock Brake System (ABS) Warning Light ON,Engine Light ON (or Service Engine Soon Warning Light)
C1540 Possible Causes
Faulty Left Rear Ride Air Spring Control Valve,Faulty Air Suspension Solenoid,Air Suspension Solenoid harness is open or shorted,Air Suspension Solenoid circuit poor electrical connection,Faulty Air Suspension Control Module (ASCM)
C1540 Description
The Air Suspension Control Module (ASCM) monitors the Left Rear Ride Air Spring Control Valve. The ECM sets the OBDII code when the Air Suspension Control Module (ASCM) detects when the Left Rear Ride Air Spring Control Valve is not to factory specifications while the ignition is in the Run position.