Poor Shift Quailty of Automatic Transmissionon Hyundai Sonata

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 : 114,684 (105,000–124,368)
2 Years Affected: 2005, 2006
3 people reported this problem
1 person shared problem details
2006 Hyundai Sonata105,000
middle gears noisy, difficulty shifting; still accelerates, but sounds like it's still in 3rd gear - even on the highway!
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