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GMC
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2001
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C3500 HD 8.1 G, Standard
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Repair and Diagnosis
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Suspension
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Electronic Suspension
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Electronic Suspension - Suspension Damping & Automatic Level Control
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Diagnostic Information and Procedures
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DTC C0690
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Conditions for Setting the DTC
Conditions for Setting the DTC
The suspension control module senses a low reference voltage out of range condition.