Poor Shift Quailty of Automatic Transmission on Hyundai XG350

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 79,257 (34,000–129,578)
4 model years affected: 2002, 2003, 2004, 2005
14 people reported this problem
Viewing 1 - 7 of 7 comments
last week I got off the 880 and took the Stevenson Blvd exit in Fremont Calif. I stopped at a red light. When it turned green I had no acceleration, max speed was 20mhp. Luckily it took it to a shop and they charged me $511 for catalytic repair. Today 4 days later, merging into freeway traffic with my whole family in the car the car had no acceleration. It still sits. I am mad 47k miles slightly over 10 year mark and no warranty for the repairs. I love this car but it is a very thin line between love and HATE! Curious to see the the dealer can solve this problem without taking me to the cleaners. I think I should have bought a Honda or Toyota instead.
auto shifting is delayed. trans fluid due for change
After taking to repair shop the car returned with shifting problems. Now the car will rev into 3000-4000 before trying to shift. This is causing other problems and trouble codes.
haven't fixed yet

thought it was just due to being in excess of 80k (about when it started). Been dealing with it for over 85k miles now (over 165k on ODO)...
transmission "kicks" into 2nd gear. coded as "relearned shift values" and they updated the computer system. $50 at the dealer.
PCM not communcating
Late shifting into third 3rd gear. Changed fluid at dealer. Seemed okay.