Limp Home Function: Notes

WARNING: This page is about a different car, the 2024 Hyundai Kona. However, it is still accessible from the selected car via links, so may be relevant.

If the PCM(ECM) detects the fault of the SMARTRA or transponder, the PCM(ECM) will allow limp home function of the immobilizer. Limp home is only possible if the user password (4 digits) has been given to the PCM(ECM) before. This password can be selected by the vehicle owner and is programmed at the service station.

The user password can be sent to the PCM(ECM) via the special tester menu.

Only if the PCM(ECM) is in status "learnt" and the user password status is "learnt" and the user password is correct, the PCM(ECM) will be unlocked for a period of time (30 sec.). The engine can only be started during this time. After the time has elapsed, engine start is not possible.

If the wrong user password is sent, the PCM(ECM) will reject the request of limp home for one hour. Disconnecting the battery or any other action cannot reduce this time. After connecting the battery to the PCM(ECM), the timer starts again for one hour.

Connect the cable of diagnostic tool to the data link connector in driver side crash pad lower panel, and power on the diagnostic tool.
Select the 'S/W Management' and 'Car model'.

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Select "Imoobilizer" and "Limp Home Mode".

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Perform the "Limp Home Mode" procedure according to the diagnostic tool screen message.