Originally Posted by retepsnikrep
The difference in the variations for the MCM programming are quite subtle but basically any MCM from a manual car of the same model 2003-2005 should work. Don't get hung up on the exact version number.
If you take the top off the mcm and find any damage or identify the relevant transistor please post some good quality pictures so we can advise further and others can also benefit.
I'm looking at honda parts dealers websites to try to find the part numbers for '03-'05 5-speed's and the part numbers appear to be identical between the 5-speeds and the CVT's within the year, but not between years. And the cost difference is a couple hundred bucks, which makes me wonder how similar they are. Is the hardware the same (within a given year) but they put different software on it depending on which transmission it has?
This is what I found:
'03 HCH1 KA5MT or KACVT
replaced by 1K080-PZA-415
'04 HCH1 KA5MT or KACVT
replaced by 1K080-PZA-419
'05 HCH1 KA5MT or KACVT
replaced by 1K080-PZA-315
I know it's backwards, but after I receive the replacement and confirm it's working then I'll try to fix my old MCM and take lots of pictures. Since I need my car to get to work, I'm not bold enough to try to fix it without having a backup plan. My MCM is working perfectly now with the exception of running my battery cooling fan at full speed all the time. While not ideal, at least it failed in a way that is still cooling the battery.