Hyundai Repair: 2001 Elantra Automatic Transaxle Trouble, turbine speed, 6 digits

Question
I'm having an intermitant problem of the transmission getting stuck in 3rd gear.  It won't upshift or downshift.  When I shut it off, it usually fixes it for a while.  It is putting out DTC (P0715; Input/Turbine Speed Sensor Circut).  I assume this controls shifting.  Aamco said there was metal in the fluid and needs to be rebuilt, may just have been due to fact that fluid was old and burnt.  I just had it flushed and called it good.  Also putting out P151000 (I cant find this code anywhere).  Any help would be truely appreciated!  Thanks.  

Answer
OK, Dirty fluid does not mean you need a trans overhaul. Even if you did and your car has less than 100000 miles on it and you are the original owner it would be covered under Hyundai's warranty.
The P0715 code is an input speed sensor on the trans. If you replace that your Fail Safe/ stuck in 3rd gear problem will stop.
As far as the other code goes I need the correct code, there are no OBD codes with 6 digits. 1 letter and 4 numbers. Double check the other code and I'll see what I can do.
BTW If your car has less than 60000 miles on it the sensor may be covered under warranty. Check with your Hyundai Dealer.