05 possible GEM module problem - Ford Powerstroke Diesel Forum
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post #1 of 18 Old 02-09-2013, 05:28 AM Thread Starter
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05 possible GEM module problem

hello guys its been awhile since my last post but here goes, 2 weeks ago i diagnosed and installed a new injector in my friends 05 6.0. i noticed when i road tested it i had no radio power (clock and the button lights all worked okay) no map lights, no power windows (door locks worked okay) also i have no light under the hood. now i did absolutely nothing with any of these items changing the injector. my friend has never had the issue with the truck. i pulled the GEM codes with my mac mentor and seen it does have a U1900 code for a controller failure, there is also another code for the keyswitch, but everyone says its a ghost code that will go on if ur door chime or something dont work. ive tested the fuses all okay, but i have no voltage to either side of them... i have researched a bit and really am not coming up with nothing other than the gem module may be toast but i dont really want to spend 300 bucks of my friends money on a whim, im a big fan of diagnostics lol. as of now i can find or think of any other fuses or connection issues that would only effect those few interior items. at this point i am afraid im looking at a GEM module. any info or help would be AWESOMELY appreciated. thanks again guys

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post #2 of 18 Old 02-09-2013, 06:01 AM
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They don't have GEM modules anymore. Your instrument cluster is causing your issue.

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post #3 of 18 Old 02-09-2013, 06:10 AM
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an 05 has a GEM

thats the unit everyone looks for to read their door code off of under the dash behind the radio

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post #4 of 18 Old 02-09-2013, 06:12 AM Thread Starter
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could you explain in a little more detail? what year did they quit using gem modules? im not familiar at all with interior problems, i am an engine/drivetrain only guys lol

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post #5 of 18 Old 02-09-2013, 06:17 AM
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I guess I spoke too quickly. I thought they got rid of the GEM and started using and calling them VSM's. At any rate, had a couple friends lately that have had similar issues and it has been the cluster. Sorry for the misdirection.

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post #6 of 18 Old 02-09-2013, 06:20 AM
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Dougs correct its a VSM not a GEM. It hasnt been a gem since 03

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post #7 of 18 Old 02-09-2013, 06:23 AM
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but the module whatever you want to call it?? so I will refer to it as a Module LOL does all the same items as the old term GEM doesn't it ?

like retained power after key of ETC

I know the dash has a lot of responsibilities also

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post #8 of 18 Old 02-09-2013, 06:49 AM
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I guess not the VSM doesn't do retained that looks like a separate relay ( oem manuals and all data )

interesting Learned sumptin new thx guys

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post #9 of 18 Old 02-09-2013, 06:51 AM
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Pretty sure an instrument cluster will fix the issue.

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post #10 of 18 Old 02-09-2013, 07:14 AM
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ouch they are around 350 ++

but you can just swap them correct ?
not like MY GM that had to be sent out and reset the mileage to existing

the Ford is in the PCM ?

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