Poor Shift Quailty of Automatic Transmission on Hyundai Elantra

Prior to replacing the automatic transmission fluid (to improve shift quality), make sure that the transmission fluid level is correct. Also, make sure the computer that controls the transmission has the most up-to-date adaptive programming information. When servicing these transmissions be sure to use fluid approved by Hyundai.

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Average mileage: 113,661 (20,888–270,000)
13 model years affected: 1999, 2000, 2001, 2002, more2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012
33 people reported this problem
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problem details
1999 Hyundai Elantra 256,000 mi,
1999 Hyundai Elantra shifts hard. When warm or hot, down shifts are very hard and makes a clunk sound. Had xmsn serviced and the problem still exists.
2010 Hyundai Elantra 60,000 mi,
Auto Transmission shifts erratic at times, even when backing out in Reverse. Put in new fluid at 72000, helped some, but the hard, erratic shifts are still there.
2002 Hyundai Elantra 117,354 mi,
some days doesn't shift right, wont change into next gear unless I lower speed
2001 Hyundai Elantra 89,062 mi,
Transmission stops pulling & motor loses power when it gets warmed up-within 10 minutes of driving
2010 Hyundai Elantra 105,000 mi,
Just purchased this car used from a dealer. Within two weeks of purchase I was experiencing a hard kick when accelerating up through 30-40 MPH as well as an engine rev until the gears kicked down. You could feel it especially when the engine is cold, but it was then happening at random times on the road. Hyundai service indicated that the transmission needed to be replaced. I have started to see an online trend of reported complaints about the transmissions with this particular vehicle. Wish I knew before I bought...definitely frustrating.
Problem not fixed. Check engine light is on. Bad torque converter or differential shifting
my 04 elantra shifts fine but every once in awhile it drops into neutral
2008 Hyundai Elantra 84,000 mi,
The gear shifts by itself when I am on the highway!!!!
2001 Hyundai Elantra 177,000 mi,
No power unfix
2010 Hyundai Elantra 26,000 mi,
just bought 2010 elantra it has 26,000 mile an it needs a fluid transmisson flush so pissed of.