DTC P0D20-422: Charger Relay Stuck Open: Description

The charge relay are located in the hybrid battery junction block assembly inside the HV battery pack. The charge relays operate according to the command from the plugin charge control ECU assembly to connect or interrupt the high-voltage circuits between the electric vehicle charger assembly and HV battery.

When the power switch is on (READY), the circuits to the HV battery are interrupted to prevent electricity leakage from the high-voltage circuits, electrical shock and fire in case of a collision.

During plug-in charging, the SMRs are closed in the order of SMRB ON, SMRP ON, SMRG ON and SMRP OFF, then the charge relays (CHRB and CHRG) are closed.

When plug-in charging is canceled, the SMRs and charge relays are opened in this order.

DTC No.	INF Code	DTC Detection Condition	Trouble Area
P0D20	422	VCHG sensor voltage is too low when plug-in charging is started even though the charge relays (CHRB and CHRG) are closed.	Plugin charge control ECU assembly Hybrid battery junction block assembly Wire harness or connector Electric vehicle fuse Electric vehicle charger assembly Electric vehicle charger wire