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.
DTC P0604: Internal Control Module Random Access Memory (RAM) Error: Procedure
- READ OUTPUT DTC (DTC P0604)
- Connect the Techstream to the DLC3.
- Turn the engine switch on (IG).
- Turn the Techstream on.
- Clear the DTCs. Refer to DTC CHECK / CLEAR .
- Turn the Techstream off.
- Turn the engine switch off.
- Disconnect the Techstream.
- Disconnect the cable from the negative (-) battery terminal and wait for 1 minute.
- Connect the cable to the negative (-) battery terminal.
- Connect the Techstream to the DLC3.
- Turn the engine switch on (IG).
- Turn the Techstream on.
- Wait for 16 seconds.
- Enter the following menus: Powertrain / Engine / Trouble Codes.
- Read the DTCs.
Result
Result Proceed to DTC is not output A DTC P0604 is output B
B → See step 2
A → CHECK FOR INTERMITTENT PROBLEMS
- REPLACE ECM. Refer to REMOVAL
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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.
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