DTC U0100-87: Lost Communication With ECM/PCM "A" Missing Message; DTC U0293-87: Lost Communication With Hybrid Powertrain Control Module Missing Message; DTC U1170-08: Lost Communication with Brake System Control Module (ch2) Bus Signal / Message Failure; DTC U1170-87: Lost Communication With Brake System Control Module(ch2) Missing Message [10/2022 - ]: Procedure
WARNING: This page is about a different car, the 2025 Lexus RX 350h, 2024 Lexus RX 350h, and 2023 Lexus RX 350h. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK DTC OUTPUT (MOTOR GENERATOR)
Pre-procedure1
- None.
Procedure1
- Check for DTCs.
Powertrain > Motor Generator > Trouble Codes
Result
Result Proceed to None of the following DTCs are output. A Any of the following DTCs are also output. B Relevant DTC P3124-87 Lost Communication between Drive Motor "A" and HV/EV ECU Missing Message HINT:
U0100-87, U0293-87, U1170-08 or U1170-87 may be stored due to a malfunction which also causes the DTCs in the preceding table to be stored. In this case, first troubleshoot the output DTCs in the preceding table. Then, perform a test to attempt to reproduce the problems, and check that no DTCs are output.
Post-procedure1
- Turn the ignition switch off.
Result:
A
GO TO CAN COMMUNICATION SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 08/2023] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2023 - ]
Result:
B
GO TO DTC CHART (MOTOR GENERATOR CONTROL SYSTEM). Refer to DIAGNOSTIC TROUBLE CODE CHART [10/2022 - ]
- None.