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: 125,119 (26,000–270,000)
12 model years affected: 1999, 2000, 2001, 2002, more2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
29 people reported this problem
8 people shared problem details
1999 Hyundai Elantra256,000
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.
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 Elantra117,354
some days doesn't shift right, wont change into next gear unless I lower speed
my 04 elantra shifts fine but every once in awhile it drops into neutral
The gear shifts by itself when I am on the highway!!!!
2001 Hyundai Elantra177,000
No power unfix
Problem not fixed. Check engine light is on. Bad torque converter or differential shifting
just bought 2010 elantra it has 26,000 mile an it needs a fluid transmisson flush so pissed of.
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