C0663 Code: Meaning, Causes, and Symptoms | OBD2 Codes
C0663 – Level Control Exhaust Valve Circuit High
C0663 Possible Symptoms
Anti-Lock Brake System (ABS) Warning Light ON,Engine Light ON (or Service Engine Soon Warning Light)
C0663 Possible Causes
Faulty Level Control Exhaust Valve,Level Control Exhaust Valve harness is open or shorted,Level Control Exhaust Valve circuit poor electrical connection
The Automatic Level Control exhaust solenoid valve is switched ON or OFF by the Electronic Suspension Control (ESC) module. The ESC module provides a ground whenever exhaust activity is required and during a head-relief sequence which occurs before each compressor start-up. This drive output from the ESC module is continually monitored to determine if the voltage level agrees with the commanded state.