Level Control Compressor Relay Malfunction
Table of contents
C0665 GMC Possible Causes
- Faulty Level Control Compressor Relay
- Level Control Compressor Relay harness is open or shorted
- Level Control Compressor Relay circuit poor electrical connection
How do I fix code C0665 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 C0665 GMC code
The cost of diagnosing the C0665 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)
C0665 GMC Description
The Electronic Suspension Control (ESC) module monitors a lift/pe signal at the Powertrain Control Module (PCM). Under normal conditions, the ESC module supplies a 5-volt reference voltage to the PCM. The PCM grounds this circuit when the vehicle is accelerating rapidly (LIFT) or braking hard (DIVE). When the lift/pe signal goes low (approximately 0-volts), the ESC module commands all four ESC dampers to a FIRM condition.