Quick GEM question - Ford Powerstroke Diesel Forum

 
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post #1 of 7 Old 07-09-2011, 07:44 PM Thread Starter
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Quick GEM question

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.
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post #2 of 7 Old 07-09-2011, 10:49 PM
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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)


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post #3 of 7 Old 07-09-2011, 11:07 PM
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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.



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post #4 of 7 Old 07-10-2011, 07:32 AM
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Quote:
Originally Posted by dazdillenger View Post
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...


2000 F-350 Lariat CCLB w. 335,000+ Mi
Tymar intake, Straight 4", 6.0 Intercooler, IDP Competition Fuel System, AC's, SB SD Clutch, ZF6 Short Shift Kit
Gearhead Tunes, Swamps IDM, Snow Performance Water/Meth, Isspro Performax Gauges & 08 Black Leather Seats
05 Harley's, Smoked tails, Weld Racing Sidewinder Wheels

Fried Piston, Re-building engine
330 RWHP Fuel Only - 363 RWHP w. Meth
Broke College kid... Eating Ramon to save for truck parts..

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post #5 of 7 Old 07-10-2011, 09:36 AM Thread Starter
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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
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post #6 of 7 Old 07-10-2011, 03:01 PM
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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.



2005 Lariat CCSB F-350 SRW
300,000 miles and going strong

Exterior
12" fabtech lift with 40" Xterrain's on M/T classic locks, Adjustable track bar, Bilstein 7100 reservoir shocks

Performance
Edge juice/attitude CTS, SCT with ID tunes, Snow meth. injection, Diamond eye 4" exhaust, 03 turbo, ARP studs, Sinister coolant filter

Interior
2010 stone seats/console, pioneer avic d3 with backup camera/bluetooth

Misc.
Viair 450c compressor, dual 2.5 gallon tanks, air horns rated @115db
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post #7 of 7 Old 07-10-2011, 10:15 PM
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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


2000 F-350 Lariat CCLB w. 335,000+ Mi
Tymar intake, Straight 4", 6.0 Intercooler, IDP Competition Fuel System, AC's, SB SD Clutch, ZF6 Short Shift Kit
Gearhead Tunes, Swamps IDM, Snow Performance Water/Meth, Isspro Performax Gauges & 08 Black Leather Seats
05 Harley's, Smoked tails, Weld Racing Sidewinder Wheels

Fried Piston, Re-building engine
330 RWHP Fuel Only - 363 RWHP w. Meth
Broke College kid... Eating Ramon to save for truck parts..

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