C0665 – Level Control Compressor Relay Malfunction

C0665 Possible Symptoms

Anti-Lock Brake System (ABS) Warning Light ON,Engine Light ON (or Service Engine Soon Warning Light)

C0665 Possible Causes

Faulty Level Control Compressor Relay,Level Control Compressor Relay harness is open or shorted,Level Control Compressor Relay circuit poor electrical connection

C0665 Description

The Electronic Suspension Control (ESC) module monitors a lift/dive 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/dive signal goes low (approximately 0-volts), the ESC module commands all four ESC dampers to a FIRM condition.