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 P0604-44: Internal Control Module Random Access Memory (RAM) Error Data Memory Failure [11/2023 - ]: Procedure
- 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)
- 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
Result:
A
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ]
Result:
B
REPLACE ENGINE STOP AND START ECU. Refer to REMOVAL [11/2023 - ]
NO RELATED
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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.