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Home >> GMC >> 2022 >> Hummer EV >> Repair and Diagnosis >> Electrical >> Charging Systems >> Plug-In Charging System >> Diagnostic Information and Procedures >> DTC P3027-P3029 >> Circuit/System Description

Circuit/System Description

The battery charger coupler lock control circuit is contained within the battery energy control module and consists of a series of switching circuits in an H-Bridge configuration to drive 12 V DC in either direction on the battery charger coupler lock actuator circuit for the purpose of engaging/disengaging the lock. Coupler lock position is monitored by a 5 V, 2-wire sensor located in the Charge Receptacle assembly.

The integrated circuit that controls coupler lock actuation is internal to the battery energy control module and not serviceable.