C0657 GMC – Level Control Compressor Circuit Low

C0657 GMC Possible Symptoms

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

C0657 GMC Possible Causes

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

C0657 GMC Description

The Automatic Level Control compressor is switched ON and OFF using an Electronic Level Control (ELC) compressor relay which is controlled by the Electronic Suspension Control (ESC) module. The ESC module circuitry provides a switched path to ground whenever compressor activity is required. This drive circuit is also continually monitored to determine if the voltage level agrees with the commanded state.