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Home >> GMC >> 2001 >> C3500 HD 8.1 G, Automatic >> Repair and Diagnosis >> Suspension >> Electronic Suspension >> Electronic Suspension - Suspension Damping & Automatic Level Control >> Diagnostic Information and Procedures >> DTC C0665 >> Diagnostic Aids

Diagnostic Aids

As part of the vehicle diagnostic system, the PCM toggles the lift/dive line within 31 seconds after the ignition is turned ON. This allows the ESC module to determine if the line is faulted or not. A retry is attempted every four minutes until successful.

An intermittent short to ground or an open in the Lift/Dive Signal circuit may cause a random firm/soft ride condition.