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GMC
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2011
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Sierra 2500 HD, 4D Pickup, 6.0 G, 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 Communications System
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Diagnostic Information and Procedures
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DTC U1843
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Circuit/System Verification
Circuit/System Verification
Verify that U0100 is not set.
If the DTC is set, refer to
DTC U0100-U02FF (with HP2)
or
DTC U0100-U02FF (without HP2)