2000 hyundia automatic

See if ur ableto shift it at the trany with ur hand into gear go to underhood or under car to the transmission disconnect the leankage should popoff with screw driver maybe hard but it just pops up have someone start car hold foot on brake with ebrake on and shift it one click should be reverse take ebrake off and see if it goes in reverse if it does its ur shift solinoid right there werelinkage clips on if dont its inside ur transmissoin

You my son are going to be spending loads of cash. Your auto box has probably several problems and to continue to try and use it like this is akin to throwing money out of the window. You need an auto box specialist and about 1500 euros

may hav burn a shift solenoid--put car on a scanner--local parts place does it for free--nomerical codes will show and explained in a manual--but bfore replacin a part a more detailed scan shud b performed

you may have somethign shock in the shifter or you may need a new tranny

1-3-4-2

It could. It could also be a bad reverse solenoid.

Sounds like clutch slipping

depends on gas pedal position,the lighter you are accelerating the earlier the trans should shift,if it always hangs on in gear get it looked at...as it can shift at redline (5000-6000 rpm,if you hold the gas peadl down fully).

sorry to say trans is fried.
Consider a used trans from the bone yard
or a rebuilt one.
An independent auto shop is likely to give you a fair price!!!!!!!!!!!!!!!!!!!

P1723 A/t control relay - Stuck on.
This Code is showing that the main control relay of the transmission is stuck on. When that happens transmission goes in to the fail safe mode which is being stuck in 3rd gear to prevent damage to the transmission