Question about 2006 Ford F-150

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Overdrive light flashing on 2001 F350 7.3 diesel truck

On our 2001 F350, only when towing our boat or 5th wheel, the overdrive light flashes and the truck has to be babied or warmed up for a while before it will go onto gear. What do you think is the problem?

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Taking a guess at it, I would have to say that the transmission fluid is thermally broke down from the heat, and stress from towing. Try to change transmission fluid and filter. If this does not fix it the transmission itself may be damaged from the excessive strain, and heat. (heat is number one cause for transmission failure. After this problem is fixed, next time NEVER tow in Overdrive. This over works the transmission, and creates the excessive heat. If you tow a lot than consider adding an after market transmission cooler. Which is only approximately 100 and up, but will save thousands in the long run:)

Posted on Jul 11, 2010

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I may be wrong,but look in your truck manual to make sure,under towing,I think when hauling,you are supposed to only use drive,,not over drive,with the selector.

Posted on Jul 11, 2010


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1 Answer

2000 f550 7.3 diesel won't go into overdrive, no flashing lights

Things to check are
  1. Trans fluid level
  2. torque converter If you do a lot of towing you could have overheated it
  3. computer system for any codes

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You have plenty of truck to tow that thing around. I would have the 20 year old tranny serviced and ask the transmission shop if its going to hold up to the pressure.

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Since 2001 your transmission is about due to fail

I would rebuild it with all the updates & add a bigger
cooler out front IF your going to tow.

Has the fluid been changed every 3 years since new?

NO --- then a death sentence to any trans

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O/D OFF light is visible below voltage gauge on bottom right when lit. You have to be in Drive to engage overdrive button.

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Why would overdrive light flash on and off

You need a code scanner to read the codes. Go to autozone or O'Riellys and ask them for a curtesy scan. Then go from there.

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F350 2005 Wrench light comes on when in tow haul mode pulling a hill 3rd back down to od

you realy need a hand held computer to erase trouble code,but what the tow button does is it locks the transmission so it doesnt go into overdrive while towing,you can manualy put shifter into drive ,not over drive

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Overdrive light flashes OFF

When my overdrive light flashed on/off took to my mechanic who hook up the vehicle to his computer. It turned out to be the turqu convertor. Had it replaced and since the transmission was dropped and my vehicle had 130,000+ miles had them give the transmission a tune up. Now have 210,000 + tow a travel trailer and other trailers and have had no problems since the repair.

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