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GMC
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2009
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Sierra 2500 HD, 2D Pickup, 6.0 K, 4WD, Part Time
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Repair and Diagnosis
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Engine Performance
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System
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Data Communication System
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Diagnostic Information and Procedures
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DTC U1815
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DTC Descriptor
DTC Descriptor
DTC U1815 00
Lost Communication With Drive Motor Control Module "A" on Bus "B"