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GMC
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2004
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Sierra 2500, 4D Pickup, RWD
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Repair and Diagnosis (Single Page)
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Accessories & Equipment
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Communication Devices
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Data Link Communication System
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Diagnostic Information and Procedures
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DTC U1881 To U1899: Starter/Generator Control Module Lost Communication With Engine Control Module (ECM)/Powertrain Control Module (PCM)
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Conditions for Running the DTC
Conditions for Running the DTC
Voltage supplied to the module is in the normal operating voltage range of 9-16 volts.