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Hummer
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2008
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H2 4D Utility Wagon
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Repair and Diagnosis
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Brakes
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Traction Control
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Antilock Brake System With TCS & VSES
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Diagnostic Information and Procedures
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DTC C0901
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Diagnostic Aids
Diagnostic Aids
A possible cause of this DTC could be overcharging with a battery charger or jump starting.
A high voltage value in multiple modules indicates a concern in the charging system.