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GMC
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2001
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C3500 HD 6.5 F, Standard
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Repair and Diagnosis
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Accessories & Equipment
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Gauges & Instrument Panels
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Instrument Panel System Displays, Gauges And Console
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Diagnostic Information and Procedures
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DTC B1023
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Conditions for Setting the DTC
Conditions for Setting the DTC
The DIC detects that a switch signal circuit is low for greater than 30 seconds.