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This is often times a sign of low transmission fluid or a faulty transmission control solenoid. As you know, automatic transmissions use pressurized hydraulic fluid to change gears or to stop showing 2nd
run the fault codes and check for problem servos/ solenoids or TCM
if the transmission is too old for that then change the transmission oil using a motor running change process ( changes the oil in the torque converter as well as the box) and then remove the pan , clean the filter and have he bands and clutch pack adjusted
older units rely on differentiating oil pressures and springs to move the valve spool in the body and any gum on the spool or weak springs make movement difficult
Could be a problem with the throttle position sensor. It's clearly an electrical issue. Besides the noise, how does the transmission shift? Is it smooth, or does it slam into each gear, or does it seem unusually soft. Shifts should be firm but smooth.
I would add transmission fluid, failing that KIA does not give out transmission diagrams even to there Techs so if that does not work it would seem you need a new transmission
This sounds like a slipping transmission , check the fluid level first and make sure its full, if its full then you have ****** problems and may need to have ****** rebuild done,
Another thing is to make sure the trans passing gear cable is connected at the throttle where the gas cable is.
There are linkages inside the transmission that allows you to change gears and so if you do not know how to get into the transmission yourself that you should have a mechanic in your area do this work. You should also talk to the car dealer to tell them this problem and how to get it fixed.
I would check the transmission and engine mounts but also it may be time for a transmission fluid change. It has a service interval just like oil. 50000 miles
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