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2017
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Express 2500 LS, 2.8L Eng VIN 1
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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 U0074: Control Module Powertrain Expansion Communication Bus Off
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Conditions for Running the DTC
Conditions for Running the DTC
Supply voltage to the control modules are in the normal operating range.
The vehicle power mode requires serial data communications.