ECM/PCM Compatibility Replacement Question
I am having an issue that may require that I replace the ECM. This is on a 2004 F150 5.4L 4X4. The ECM number is 4L3A 12A650 AEE.
I am new to this, but gather that the replacement has to exactly match this for everything to work?
Seems like the first 4 digits denote the year and model. Do the last three digits denote the powertrain options? I've found lots of almost matches on used parts sites. But nothing that exactly matching the last 3 digits yet.
Some folks have said that you can call the dealer and find what will cross with the vehicle using the VIN. My dealer said that they couldn't. Any other source available to find out what can interchange?
Will a ECM swap mess up the PATS key programming?