DTC Summary

The hybrid vehicle control ECU detects a stuck closed malfunction of a system main relay on the HV battery positive (+) terminal side.

The cause of this malfunction may be one of the following:

Inverter voltage sensor (VH) internal circuit malfunction 

• Voltage sensor (VH) malfunction
• Motor generator control ECU (MG ECU) malfunction
• Communication (wire harness) malfunction

High voltage system malfunction 

• HV battery junction block assembly malfunction

Low-voltage circuit (12 V) malfunction 

• Hybrid vehicle control ECU malfunction
• HV battery junction block assembly malfunction
• Low voltage wire harness malfunction
• Low voltage connector malfunction