Just a shot in the dark....but check to see if you have all the external connection on .Electrical as well as any vacuum lines.?let me know the outcome.
Mass air flow sensor it is bad .replace it immidiatly
Misfire , plugs , coil , etc ? Check engine light on or flashing ?
SOURCE: transmission/shifting 2001 Sante Fe - Hyundai
Sounds like you might have serious internal transmission problems.
As soon as you can, get someone with a code reader to plug in the vehicle and find out what the code is for the Check Engine light to come on. Might give you a better picture of what`s going on.
It could also (cross your fingers) be something more usual like a clogged transmission filter (located inside the pan), or shift solenoid.
By the way, have you checked the level, look & smell of your transmission fluid?
Level should be checked with the vehicle running, after passing it in all gear ranges on the shifter, and putting it back in park (Check it on "cold" or "hot" level depending on if it`s been driving for a while or not).
As for look and smell, it should be reddish and not smell burnt. Hard to describe the smell of burnt transmission fluid, but normal fluid does not smell too strongly, kind of sweet. Burnt oil is usually black and has a strong odor. If the oil is burnt you have internal damage to the transmission.
One piece of advice I give you is get it fixed as soon as possible because if you don`t already have serious internal transmission problems, the longer you wait, the more chances you have of getting some, to the point of the vehicle just refusing to move. And believe me, speaking from experience, the transition point from the symptoms you describe to total refusal to move and the need for a tow/transmission rebuild is not that long usually.
SOURCE: Hyundai Santa Fe 2005 won't shift into first gear
Most likely the o-ring seal between the torque converter and the transmission is going bad. Get that transmission rebuilt pronto before serious damage is done! But first, have a mechanic drop the transmission pan and look for signs of a very thin silvery film coating the inside of the pan. If found, then the transmission definitely will have to be rebuilt, and the torque converter will also have to be replaced since embedded metallic particles in the old torque converter will eventually come loose, due to wear of the clutch plates within the torque converter, and eat up the rebuilt transmission. Now, here is the deal once the transmission has been rebuilt:
Change the transmission fluid and filter once a year -- no matter what! If you do this, then you should never have any more problems with the transmission.
SOURCE: Transfer gear case shift jammed
There are four probable causes when the gear is stuck in one position, and they are precisely explained in this handy diagnostic article that I know will help narrow down the culprit of your difficulty:
http://yourhandymanzone.com/Your_Handyman_Zone_How_To_Pages_Vehicle_Car_Zone_Cars_Trucks_Vans_Transmission_System_Stuck_In_One_Gear.htm
Good luck!
Brad
SOURCE: my 2002 Hyundai Accent goes into 1 gear smoothly,
CHECK ENGINE light??? Whenever the 'CHECK ENGINE' (Service Engine Soon) light comes on, the ECU (Engine Control Unit) sets a Diagnostic Trouble Code (DTC). These codes identify the particular engine management system which caused the light to come on.
You'll need to use/find an OBDII (On-Board Diagnostic) Scanner to retrieve any code which have been stored in the ECU computer. Afterward, we might be able to help you DIAGNOSE the problem and perhaps eventually fix the problem.
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