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Home >> GMC >> 2001 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> Suspension >> Electronic Suspension >> Electronic Suspension - Suspension Damping & Automatic Level Control >> Diagnostic Information and Procedures >> DTC C0690 >> Circuit Description

Circuit Description

The suspension control module provides a common ground (low reference) for all four of the shock solenoid valves. The suspension control module monitors the return voltage on the low reference circuit (ground) for a voltage out of range condition.