DTC Summary

WARNING: This page is about a different car, the 2025 Lexus RX 450h+ and 2024 Lexus RX 450h+. However, it is still accessible from the selected car via links, so may be relevant.

MALFUNCTION DESCRIPTION
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
- No. 2 traction battery device box assembly malfunction
Low-voltage circuit (12 V) malfunction
- Hybrid vehicle control ECU malfunction
- No. 2 traction battery device box assembly malfunction
- Low voltage wire harness malfunction
- Low voltage connector malfunction