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Hummer EV
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DTC P300B
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Circuit/System Verification
Circuit/System Verification
Vehicle On - Service Mode
Verify DTC U02CE, U05CF is not set.
If any of the DTCs are set
Refer to:
Diagnostic Trouble Code (DTC) List - Vehicle
Go to next step: If none of the DTCs are set
Advise the customer to report a problem with the DC fast charge station.