Question about 1991 Ford F250

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Transmission issues, codes included

Hi my trucks (1991 Ford F250 7.3 Diesel) od light blinks and the tranny does not shift on its own, when i put it in drive it takes off in drive it does not go through first and second gear, but if i start it low and shift to drive it is fine, i also do not have overdrive and my speedo is really loose or bouncy, im am also not sure if my abs light is one because there is no bulb in it (i just got the truck) I scanned the trucks codes today and came up with the following using a genisis scanner: KOEO ON DEMAND CODES: 22,23,56,91,92,93,94,99. KEEP ALIVE CODES: 22,56,99.

Thanks alot, Jordan

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  • Anonymous Apr 02, 2009

    my new truck is doin the same thing. took it to shop , they put it on scanner and said it came back clean. but the tack still dont work and it still wont shift gears .someone eles checked it and said it was a bad tranny controle mod. i have $650 in parts tryin to fixit now realy dont want to send $480 more and it not fix it ether



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Check to see if the wire is lose tran sender

Posted on Dec 27, 2008


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I have a 1991 ford f 250 diesel with a4od transmission the problem is my tachometer stopped working and the light on the od button came on this interfers with transmission shifting it will not take off in...

check to see if the computer is getting proper voltage on the yellow wire if that is not it ckeck the large red wiresmy dads truck had this problem last year the yellow wire was defective in the harnes the tack and the transmission work off the computer trust me it is a simple fix run a new wire from the solinoid on the pasenger side to the computer relay on the driverside and replace the relay too

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Please rate and god bless:)

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