overdrive not cancelling

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Mar 17, 2004 | 03:05 PM

foot947

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Joined: Jan 2004

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From: ga

overdrive not cancelling

i have 1999 F550. the overdrive will not cancel off. i do alot of towing so this is aproblem needing fixed asap. i bought new overdrive switch on gear shift but did not fix. brought it to tranny shop they said it was probably in wiring and did not have time to check it. i took the overdrive switch back off and checked the leads with meter.i read 12 volts with key on at one of the terminals nothing on the other 2. i assume those do not read unless the switch is plugged in. any answers will be appreciated.

Mar 17, 2004 | 03:12 PM

Stroker01

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Joined: Mar 2004

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From: Central PA

Try checking the wireing down where it plugs into the tranny. Dhould be on the left side. Check for loose wiring going into the plug assy and broken insulation. Good luck!

Mar 17, 2004 | 06:40 PM

foot947

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From: ga

i checked all wiring i could get to . everything seems tight. if i knewwhat wire it was that cancels theoverdrive i could check to see if it is getting power to that wire at the trans.

Mar 18, 2004 | 03:42 AM

Stroker01

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From: Central PA

Sorry, thats all I can realy help with. It may be an internal solenoid or something on that note.

Mar 18, 2004 | 07:24 AM

Casey

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Joined: Jul 2003

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The wiring from the OD button goes to the PCM, not to the transmission.

Frequently the wires break inside the steering column where the column bends when you tilt the wheel.

Mar 19, 2004 | 03:58 PM

crashandburn420

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Joined: Jun 2003

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From: Albertville, AL

I think I might have the same problem. When I push mine, the OD off light comes on, but instead of downshifting it goes into the freespooling coast mode. Weird.

Mar 22, 2004 | 08:14 PM

foot947

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From: ga

problem fixed today. it was broken wires in steering column,replaced overdrive wiring harness which i guess came with new gear shift. cost 150.00 parts & labor.works fine thanks for help.

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