Passkey Theft Deterrent issue?

Intermittently, I have trouble getting the engine started. The engine starts but immediately shuts down and sometimes the lock symbol is displayed on the instrument panel. In addition, lately, the IPC will be totally dead for an undetermined delay, up to two minutes, and then it suddenly comes alive. Also, I have had the IPC go dead while driving and sometimes come back alive before reaching home. Another issue is that the trip odometer always resets to zero on a start and the overall odometer always starts at a given number on start. Both function normally while driving, unless IPC goes dead. I have been trying to determine which passkey, I or II or III, I have. I have replaced the ignition switch, and I can say that I only have two small wires coming from the ignition switch, green and black. If I can get past the engine start (passkey issue) I can drive the car given that I may not at times have a functioning IPC. Do I need to replace the BCM?