DTC P1623: Unregistered Transponder: Troubleshooting

P1623: TROUBLESHOOTING CHART

Step	Action	YES	NO
1	Was "Immobilizer Control System Check" performed?	Go to Step 2.	Go to IMMOBILIZER CONTROL SYSTEM CHECK .
2	DTC check Check if any DTC other than P1623 is detected referring to DTC CHECK . Is DTC other than P1623 detected?	Go to applicable DTC troubleshooting.	Go to Step 3.
3	Registration of unregistered ignition key with ECM Register the unregistered ignition key with ECM referring to REGISTRATION OF THE IGNITION KEY . Was registration of ignition key completed?	Recheck DTC.	Go to Step 3.
4	Registration of the spare ignition key Register the spare ignition key referring to REGISTRATION OF THE IGNITION KEY . Was registration of spare ignition key completed?	Replace ignition key which cannot be registered.	Substitute a known-good ECM and recheck.