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GMC
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2014
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Yukon SLT, 4WD
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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 U1842: Lost Communication With ECM/PCM
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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 (without HP2)