Diagnostic Trouble Code (DTC) List

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Diagnostic Trouble Code List

Courtesy of GENERAL MOTORS CORP.

DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION

DTC	Definition
C0655	Level Control Compressor Relay Malfunction
C0660	Level Control Exhaust Valve Circuit Malfunction
C0711	Suspension Control Module Detects Improper Signal Voltage