Level Control Exhaust Valve Circuit High
Table of contents
C0663 GMC Possible Causes
- Faulty Level Control Exhaust Valve
- Level Control Exhaust Valve harness is open or shorted
- Level Control Exhaust Valve circuit poor electrical connection
How do I fix code C0663 GMC?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the C0663 GMC code
The cost of diagnosing the C0663 GMC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Anti-Lock Brake System (ABS) Warning Light ON
- Engine Light ON (or Service Engine Soon Warning Light)
C0663 GMC Description
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.