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Discussion Starter · #1 ·
transmition has gone in limp mode lite on shift lever is flashing has anyone had this problem if i reset computer goes out of limp mode but after 4 or 5 miles goes back into limp mode and lite flashes i have been told overdrive wire in colum is a problem in these and will do this i hope this post is ok on the forum thanks when we put computer on it and do driving test pressure is good clutchs are shifting and releasing right
 

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Most likely the rear differential sensor, or its associated wiring. Usually, the flashing light means some thing from the flywheel to the rear end is off or worn, but most every time Ive seen ir ir heard about it, its the sensor.
 

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Discussion Starter · #3 ·
John M said:
Most likely the rear differential sensor, or its associated wiring. Usually, the flashing light means some thing from the flywheel to the rear end is off or worn, but most every time Ive seen ir ir heard about it, its the sensor.
thanks i will check that i have ordered factory service cd but most times on hand experiince is much better when the light flashes shifts hard hard on fuel and really doggy just over 100000 miles with 15 box
 

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Discussion Starter · #5 ·
soundguy said:
when you figure it out, let us know.

my 99 f350 did the light flashing thing, but it was a bad GEM module
what and were is gem module it a powerstroke
 

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mines a psd as well.. gem module is back side of the fuse box... which is about 10" to the left of your left knee, behind the emergency brake release. they are about a 500$ part.

I hope yours is something ez like the sensor mentioned. :)
 

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Discussion Starter · #7 ·
soundguy said:
mines a psd as well.. gem module is back side of the fuse box... which is about 10" to the left of your left knee, behind the emergency brake release. they are about a 500$ part.
I hope yours is something ez like the sensor mentioned. :)
thanks what does the gem module control if i disconect battery light stays off for 4 to 5 miles do you know if there is a test for it
 

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the gem is pretty much the go between , between everything electronic in t he truck and the ECU.

and I do mena everything.

when my GEM ( generic electronic module ) went out. i had no keyless entry fob, nodome lamps, no door kick panel lamps.. dash and gaug ecluster did weird things.. doors locked and unlocked randomly. even made starting eratic.

you need a ford powerstrok specific code reader to test the truck. the generic code readers won't read any of the special code data that is manufacturer specific.

I have such a reader for my 04 powerstroke.
 

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Discussion Starter · #9 ·
soundguy said:
the gem is pretty much the go between , between everything electronic in t he truck and the ECU.

and I do mena everything.

when my GEM ( generic electronic module ) went out. i had no keyless entry fob, nodome lamps, no door kick panel lamps.. dash and gaug ecluster did weird things.. doors locked and unlocked randomly. even made starting eratic.

you need a ford powerstrok specific code reader to test the truck. the generic code readers won't read any of the special code data that is manufacturer specific.

I have such a reader for my 04 powerstroke.
this is a base stake truck no power anything and i dont have any other electrical issus code reader we have turns laptop in to anilizer will do all ford and north american models cost a thousand bucks needed it for our 6 litre i dont know how to use it or know much about it but my son does im pretty much from old school looking at gem modules on internet cant seem to find any pre 99 thay are around 260
 

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Discussion Starter · #11 ·
soundguy said:
don't know what to tell ya :)
thanks for the help inow more know than i did and gives me some starting points factory repair cd should be here this weekwill take look at it for ideas to friend of mine has large auto wreckers may have right gem module and rear end sencer probibly can test sencer with ohm meter
 

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i do know the 'brain boxes' generically speaking here, were different prices in different years.. and usually the older the machine, the cheaper it was.

as I said, the repalcement part for my 99 gem was like 495$ part only.. i saw the actual invoice.

I had a module changed on a 90 ford van.. it was a paltry 100$

Also.. these prices were from 1.25 ys ago.. I know things tend to sometimes get cheaper as time goes by.

I repalced the fuel pump in the tank on my 98 dodge in oh.. 02.. it was 600$ for the pump, sender and fitler assy. as was a dealer only item.. now it's widely available and half that price and can be ordered aftermarket.

funny how parts are. I replaced the fan in my powerstroke. ford fan was 400$ napa fan was 290$ I put the napa one on and it was all noisy as get out and came on and off oddly. took it back same day and put ford fan on.. much quieter...
 

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Discussion Starter · #13 ·
you have to check prices put fan belt and tensoner on last year belt from ford $50 napa $100 tensioner ford $100 napa$50 seams strange brake rotors for 07 montana napa $180 gm factory $90 white box $59 and its everywhere drawbar for 120 hp johndeere $900 a and i $180 and its lasting as long as jd did the put hole very close to back of drawbar when you disc a lot rocking motion wears hole oblong
 

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Discussion Starter · #15 ·
phoned ford gem mod no longer available rear end sencer $47 read on internet torque converter can do it this is going to be a nightmare and i think i have heard they have coverter problems makes me wonder why its ok for 4 or 5 miles after you disconnect battery cable
 

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SOMEBODY is rebuilding the GEMs, I just cant find it. I know somebody is. But I still think its the rear end sensor.
 

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Discussion Starter · #18 ·
John M said:
SOMEBODY is rebuilding the GEMs, I just cant find it. I know somebody is. But I still think its the rear end sensor.
thats thr first thing im going to try then im going to pull o d harness in steering colum iwas at dealer today they said that harness is a problem i got ford dealer repair cd in mail yesterday son is n his way home from georga with a load of penuts when he gets here ill get him to run cd for me he understands some of the electrical better than me i dont put truck back on road till may but want to get it fixed also does anybody know if these trucks have torque coverter problems on a ford truck forum a guy said his flashing light was caused by bad torque and if you keep drtving will take trans out of it but when i asked dealer he said they have never sold a torqe for one of these but ford has a recall on freestar torque converters now
 

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Discussion Starter · #20 ·
son is back home hes going to run factory repair cd tomorrow see what it says have had a number of peaple tell me torque coverters are a problem if you work or chip these trucks i run heavy loads of produce with this truck and dont want break downs so im going to put new torque in it as a precaution anyway
 
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