DTC P0604-44: Internal Control Module Random Access Memory (RAM) Error Data Memory Failure [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.
- CLEAR DTC
- Clear the DTCs.
Powertrain > Stop and Start > Clear DTCs
- Turn the ignition switch off.
Result
Proceed to NEXT
Result:
NEXT
See step 2
- Clear the DTCs.
- READ OUTPUT DTC (DTC P0604-44)
Pre-procedure1
- Disconnect the cable from the negative (-) battery terminal and wait for 1 minute.
- Connect the cable to the negative (-) battery terminal.
- Turn the ignition switch to ON.
- Wait 16 seconds or more.
- Read the DTCs.
Powertrain > Stop and Start > Trouble Codes
Result
Result Proceed to DTCs are not output A P0604-44 is output B
Post-procedure1
- None.
Result:
A
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ]
Result:
B
REPLACE ENGINE STOP AND START ECU. Refer to REMOVAL [10/2022 - ]