DTC 21: ECM/Immobilizer Control Module Code Not Matched (Immobilizer Control Module Side)
System Description
Immobilizer Control Module checks if ECM/Immobilizer Control Module code transmitted from ECM and that registered in Immobilizer Control Module match when ignition switch is ON. If they do not, this DTC is set.
Perform procedure described in Procedure after ECM Replacement:M13A Model .