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.Google+
Car Problem Reports
Hyundai Elantra Confirm Latest Software For Transmission Control Module and Correct Fuild For Proper Shift Quailty
Hyundai Elantra Problem
Average Mileage: 116,262 mi (26,000 mi - 256,000 mi)
Visitor, 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.
Visitor, 2002 Hyundai Elantra, 117,354 mi
some days doesn't shift right, wont change into next gear unless I lower speed
Visitor, 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.
Visitor, 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.
Visitor, 2004 Hyundai Elantra
my 04 elantra shifts fine but every once in awhile it drops into neutral