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Bring it to a different shop and have them diagnose it. If it was a true software bug, Ford would have updated the firmware on your vehicle's computer. Don't go back to that dealer, because they are obviously lazy and incompetent. I would consider contacting national Ford customer service dept. and filing a complaint, if this was a dealer that told you that. Contact Us Ford Motor Company Customer Service Ford com
This may sound crazy to you. Check the fuse that controls the speedometer, cruise control and interior dome light. My 93 f150 battery was going dead every night. One morning I noticed the dome light inside was still on. I couldn't get it to go off so I pulled the fuse that is under the dash on the driver side. Light went out and so did speedometer. When I drove it later that day it wouldn't shift from low until I let off the gas. Then it would shift around between gears for no apparent reason. It took me a day of two to put 2 and 2 together. When I put the fuse back in, the speedometer started working and it started shifting normally. I finally took the bulb out of the dome light and now all is well.On the 93 f150 the speedometer is electronically linked to the transmission shifting points. You may have other fuses that are linked to your transmission.
Transmission sensor.your gear ratio was not set up properly..Its supposed to be mapped out soo the tranny shifts at a neutral rpm(around 2500-3400 rpm) its punching into gear correct?could have been a rebuilt tranny in which case they just replace the current problem..Or it could be a flywheel.1st thing to get done is to change the transmission fluid and filter.Goto midas or somewhere like they and they call it a flush and fill and it costs around $160 which is best case scenario.
I have a 07 Passat and my car does this when I use plus gas too often (which was almost every fill up because gas is too high!!!). I brought my car to the dealership for the same problem and I was told to alternate the plus and premium gas to keep a balance. It's almost like a knock and then the car jerks hard after being sluggish. Try alternating between the plus and premium gas and see if that helps.