OBDII Code List

C0665 BUICK - Level Control Compressor Relay Malfunction

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

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

Possible symptoms

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

C0665 Buick 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.
OBDII Code C0665 Buick - Level Control Compressor Relay Malfunction -

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