Sudden Downshift?
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Cross-Country
Joined: Jun 2011
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Sudden Downshift?
Recently my '11 supercab suddenly downshifted from 6th to 3rd while rolling along easily at about 50mph at the bottom of a very slight downgrade. It has done this 3 times now and takes me totally by surprise every time. Has anyone else had this happen? I have an appointment next week to get it looked at, but my dealer is about 225 miles away and it's a real pain to take it in.
Resident smarta$$
Joined: Aug 2006
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From: Oaks,PA
Do you have it in T/H? If so and you tap the brakes it will do that, but 6 to 3 sounds like an issue. Well not from 6 right into 3rd, it shouldn't be doing that IMHO. Keep us posted on what the dealer says.
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Cross-Country
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The oilfield service company I work for in Prudhoe Bay runs a large rental fleet, and has their own Ford shop. I asked the guy there about this and he told me they had several cold weather issues with them, including one that tried to shift into reverse when going down the road. My problem was the last time I was home in February when it was still below zero here, so maybe it is due to ice and snow buildup or something. Hope the dealer doesn't want to keep it overnight.
Elder User
Joined: Dec 2010
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From: sunnyvale
mine did this on my way home from Washington i took it straight in to ford they told me i had a bad merconik valve body? sorry spelling is way off i know. after it got changed out and re flashed it. its working OK i guess but its still relearning.
Resident smarta$$
Joined: Aug 2006
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From: Oaks,PA
Thanks for coming back and reporting 
Off topic, Ice Road Truckers is one of my favorite shows. Have you ever been on the show? And, have you ever met Maya or Lisa? 
Off topic, Ice Road Truckers is one of my favorite shows. Have you ever been on the show? And, have you ever met Maya or Lisa?
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Cross-Country
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We get a charge out of that show, mainly because our company is one of the premier ice road builders. Most of that show takes place on the Dalton Highway, which, although a very difficult and dangerous road, is NOT an ice road. That thin ice stuff, at least in Alaska, is pure bull. The oil companies would never risk lives and that kind of money to thin ice. The roads are engineered to carry the load. Go to Peak Oilfield Service Company, click on Prudhoe Bay division, then on "Vanishing Ice Roads" video, for a look at the way it really is.
We hold the record for the heaviest load ever moved on the sea ice, one of the Alpine production modules, at 1825 tons. Yes, I've met Lisa once.
We hold the record for the heaviest load ever moved on the sea ice, one of the Alpine production modules, at 1825 tons. Yes, I've met Lisa once.
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Cross-Country
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Cross-Country
Joined: Jun 2011
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Well, it did it again today. I was doing about 57mph on a flat level stretch, steady light throttle, and bang, right from 6th to 3rd, and back up to 6th after a couple seconds. I guess we can rule out cold weather, 56 here today!
Elder User
Joined: Dec 2010
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From: sunnyvale
wow tell them about mine (post #9) and what i had done and then ask if thats a option or if they think it could be something along that line. ill have to say my truck still don't shift right but its a hell sight better after that service work was done.
Cargo Master
Joined: Nov 2011
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From: Northern California
Moderator
Joined: Jul 2011
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From: Sioux Falls Area
which engine?
cruise on or off when it happens?
one thing that comes to mind is a grounding issue that another memeber had..... his symptoms were different, but grounding can do some seriously wierd things. (BTW, i was the one that MISSED the nail in this thread
so take everything i say with a grain of salt
)https://www.ford-trucks.com/forums/1...t-problem.html
edit ...
something else just came to mind is that your mid 90's dodge products would do this when their Throttle Position Sensor (TPS) would go out. the TPS would go to Zero ohms, telling the computer that the engine is at full throttle causing the downshift..... not sure the new fords even have a TPS, being that the throttle is drive by wire ... but that's what came to mind
keep us posted
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Cross-Country
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It's a 5.0, and always does it in the drive position. I seldom use T/H and we really can't use cruise on most of our roads. My dealer is a 5 hour drive from here(we have a local dealer with a poor service reputation), so it's usually an overnight trip to get anything looked at. Will probably be mid July before I get back up there.
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Cross-Country
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Now that I think about it, the door lock button on the driver's door quit working over the winter. Turned out to be a corroded wire that was never properly sealed when the dealer installed the autostart. Seems like both problems happened about the same time.