DTC P0604-44: Internal Control Module Random Access Memory (RAM) Error Data Memory Failure [08/2023 - ]: Procedure
WARNING: This page is about a different car, the 2025 Lexus RX 450h+, 2025 Lexus RX 350h, 2024 Lexus RX 450h+, 2024 Lexus RX 350h, and 2023 Lexus RX 350h. However, it is still accessible from the selected car via links, so may be relevant.
- CLEAR DTC
Pre-procedure1
- None.
Post-procedure1
- Turn the ignition switch off.
Result:
NEXT
See step 2
- READ OUTPUT DTC (DTC P0604-44)
Pre-procedure1
- Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute.
- Connect the cable to the negative (-) auxiliary battery terminal.
- Wait 16 seconds or more.
- Read the DTCs.
Powertrain > Engine > Trouble Codes
Result
Result Proceed to DTCs are not output A P0604-44 is output B
Post-procedure1
- None.
Result:
A
CHECK FOR INTERMITTENT PROBLEMS. Refer to CHECK FOR INTERMITTENT PROBLEMS [10/2022 - ]
Result:
B
REPLACE ECM. Refer to REMOVAL [08/2023 - ]