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when vw started to use the computer controlled gearbox system a criticism was the shift was very harsh,to counter this they made it rev slightly before changing.so that you know the system, try this out....without touching the gas.....put it in d and let the car accelerate to its max speed,stop,then use 1/3rd of gas (keep your foot still)and let it do the same...stop,then,if safe,put your foot to the floor,hard, notice when the car changes gear(revs/speed)then if you drive,only using the first1/3rd of the gas,the cars change pattern will alter to suit.......wierd it is.....
i have a 2001 xg-300 to same problem there's two speed sensor on the transmission (outpout and input) there's your problem i had the same problem change both of them (expensive but it's worthed)Remove the batery and the batery suport they are both there on the top of the transmission...they cost the same price around 221$ each, here at hyundai dealer in Québec please reply...thanks! Patrick!!....
the trans computer has seen a problem possible a bad sensor, or an internal problem, and puts it into a safe mode, or limp home mode , it wont shift , it will stay in 3rd gear, this way this reduces the possibility of further damage trans damage, when you turn the ignition off and back on it resets the tcm, my advice is to take it to your local dealer, they can diag your trans as they know the product, i dont advise pep boys, or discount auto parts.
Your transmission is "downshifting" which is a normal function...However if it's happening early, the throttle cable may be out of adjustment. This does not happen in 3rd gear because that's how the system is designed. Downshifting is a 4 (od) to 3rd gear shift...if already in 3rd, this won't happen. As long as trans shifts normally on flat ground with no slipping or delayed shifts, just service it regularly and it should be fine.