DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message [10/2022 - ]: Procedure
WARNING: This page is about a different car, the 2025 Lexus RX 350, 2024 Lexus RX 350, and 2023 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC U0100-87)
- Read the DTCs using the GTS.
Powertrain > Transmission > Trouble Codes
Result
Result Proceed to Only U0100-87 is output A U0100-87 and other DTCs are output B
Result:
B
GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART [10/2022 - 08/2023] , or refer to DIAGNOSTIC TROUBLE CODE CHART [08/2023 - 10/2024] , or refer to DIAGNOSTIC TROUBLE CODE CHART [10/2024 - ]
Result:
A
See step 2
- Read the DTCs using the GTS.
- REPLACE ECM
HINT:
Refer to REMOVAL [10/2022 - ]
Result
Proceed to NEXT Result:
NEXT
PERFORM REGISTRATION. Refer to REGISTRATION [10/2022 - ]