Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2010 Lexus LS 460L AWDFACTORY OEM SERVICE PROCEDURE

DTC P0604: Random Access Memory (RAM): Procedure

CHECK DTC
1. Clear DTC. Refer toDTC CHECK / CLEAR .
2. Turn the engine switch off.
3. Disconnect the battery negative terminal and wait for 1 minute. Refer toPRECAUTION .
4. Connect the battery negative terminal. Refer toPRECAUTION .
5. Turn the engine switch on (IG).
6. Connect the Techstream to the DLC3.
7. Turn the Techstream on.
8. Enter the following menus: Powertrain / Engine / Trouble Codes.
9. Check DTC.
  OK
  
  P0604 is not present.
NG → See step 3

OK → See step 2
CHECK FOR INTERMITTENT PROBLEMS. Refer to CHECK FOR INTERMITTENT PROBLEMS
REPLACE ECM. Refer to REMOVAL

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.