Quick GEM question

[Lowbuckskidoo]

Hello, Im new to this site and new to having a ford. I have a e99 with a known bad GEM. Im looking to replace it with a used one but am having confusion on what will work. Mine is F81B-14B205-EL, fords part website shows F81B-14-205-EP (for 4x4 esof, keyless entry, power window/lock) for replacement, among 4 others with/with out esof, keys entry and stuff. I guess whats confusing me is the last two letters in the part number. I see many different last letters but when i search the difference i cant find anything. Is there just one GEM with just different programs or are there a few different GEMs which can more functions than the other? I just want to make sure before i start buying parts. Thanks in advance, Corey.

[the1laf]

I don't have a clue on the differences, but I know you will need one specifically from an E99 unless you run tunes because Ford changed the components configuration of the motor several times from 1999 through '03.

For future reference, the "General Electric Module" is more commonly referred to as the "PCM" (Power Control Module) or "ECM" (Electronic Control Module)

[dazdillenger]

99, 00, and early 01 gem's will work fine, as long as the installed options are similar. The closer you get to the exact configuration, the better.

[the1laf]

Originally Posted by dazdillenger

99, 00, and early 01 gem's will work fine, as long as the installed options are similar. The closer you get to the exact configuration, the better.

That's good to know, my E99 is 250hp, y2k is 235hp, and the '01 is 275hp... i thought that would really screw something up...

[Lowbuckskidoo]

Actually the GEM and PCM are two different animals. PCM is mostly engine and located down by e brake while the GEM from what I read controls most functions like shift on the fly, power windows, locks and is bolted right on the back of the fuse panel under the dash.

I just want to know if all the GEM's are the same and can be programed for any/all functions or if theres different Gems that can handle more functions vs the others

[dazdillenger]

Yes, the GEM just controls electronics inside the cab-accesories like power windows, locks, esof, etc. The pcm controls the engine.

Yes, all like year superduty Gem's are the same with the exception of the programming, and the dealer can correct that. I doubt you'd need to however, as most of the time you won't notice any loss in functionality as long as the trim packages were close.

[the1laf]

Sorry for my confusion, this is the first time i have heard of an electric module on these forums that hasn't been actually the PCM... My bad