99 expo OD light flashing
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Senior User
Joined: Oct 2002
Posts: 147
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From: Staten Island
99 expo OD light flashing
I have a 99 eb expo. Today the of light is flashing and the tranny seems to be shifting a little hard. Yesterday I got caught in a major storm and there was alot of flooded roads. I am wondering if I should pull all wire harnesses goingbtontrans and make sure they're fine? I have a obd2 scanner, would this get the trouble codes if the ck Eng light is not on
Senior User
Joined: Jul 2008
Posts: 131
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no. if i remember right you need a tranny code machine. there is a few different things it could be. look in these, but search od light blinking, theres a lot more.
https://www.ford-trucks.com/forums/1...ssing-3rd.html
https://www.ford-trucks.com/forums/9...-problems.html
https://www.ford-trucks.com/forums/1...-flashing.html
https://www.ford-trucks.com/forums/1...ssing-3rd.html
https://www.ford-trucks.com/forums/9...-problems.html
https://www.ford-trucks.com/forums/1...-flashing.html
Freshman User
Joined: Dec 2010
Posts: 36
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From: Littleton CO
I "think" the flashing OD light is the check "engine" light for the tranny. On my diesel, it was a TCM (trans control module) that went bad. I don't know if the Gas units are separate units or in the PCM.
Junior User
Joined: Nov 2003
Posts: 59
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I also had this problem with my 99 Expedition. Your transmission has reverted into what is known as "safe" mode which is why your transmission is shifting roughly. Get it to a transmission shop and have it inspected. If you continue to drive while in safe mode you may seriously damage the transmission. This is its way of warning you there is a problem and it has entered safe mode to minimize further damade.
I brought mine to the Ford dealer and the diagnosis was a bad valve in the trannsmission, a $300 or so fix. Pales in comparison to a trashed $3000 transmission which is what you will likely have if you ignore these warnings the transmission is giving you.
I brought mine to the Ford dealer and the diagnosis was a bad valve in the trannsmission, a $300 or so fix. Pales in comparison to a trashed $3000 transmission which is what you will likely have if you ignore these warnings the transmission is giving you.
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