B1602: Invalid Key Code Format From Ign Key Transponder

B1602-1 - B1602-2:

B1602-3:

NOTE: Verify the customer key chain is not the cause of interference. Large metal objects on the key chain or a second encoded ignition key on the same key chain may cause this DTC under certain conditions. Check to make sure the encoded ignition key used by the customer is an approved Ford encoded ignition key (encoded ignition keys from Rotunda, Ilco, or Strattec are approved encoded ignition keys).