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Home >> GMC >> 2022 >> Hummer EV >> Repair and Diagnosis >> Electrical >> Motors, Switches, Relays >> Hybrid/EV Energy Storage - Diagnostic Information And Procedures (1 Of 2) >> Diagnostic Information and Procedures >> DTC P0C78 >> Diagnostic Aids

Diagnostic Aids

DTC P0C78 may indicate the high voltage system is not intact. Always visually inspect the high voltage connectors to verify the connectors are completely seated.