My 2012 Sonata Hybrid has been having very consistent acceleration issues ever since the transmission was replaced by Hyundai 4 years ago. After driving for an hour on the freeway, when coming to a stop either exiting the freeway or in traffic, pressing down the gas pedal sometimes will do NOTHING for 5-8 seconds and then finally drives. I have the gas pedal down all the way. It is very dangerous. The problem has been getting worse and more consistent, especially now that I moved and drive further distances around my new home.

I brought it into a Hyundai dealership last week and they drove it around, ran diagnostics, but could not reproduce the issue or find anything wrong. I told them it ONLY happens when driving the car for about ~1 hour first to fully warm it up. They refused to drive the car for an hour and would only drive it for about 10-15 mins at a time. I told them that's pointless because the issue does not present itself until it's fully warmed up. They charged me $200 for diagnostic because they refused to drive the car long enough to experience the issue. I only have 11k miles left on the warranty and want to make sure this problem is resolved before warranty runs out.

Note: All recall work has been done on this car prior to this issue.

Has anyone had this issue or have any recommendations on what I should do?

 

Can we ask what was the original problem that caused them to replace the trans ?

Is any chance you can try a different dealership service dept, while it is still under warranty?

 

does the track light come on when it wont accel?

 

Did you ever figure out what the problem was here? I JUST bought one of these cars used and its had this issue twice in the last few days. I'm going to take it back to the dealership for them to try and figure out but if you know what the issue was it would be most helpful since I cant always get it to do this, seems rather random when it does. Thanks for the help!

 

One thing you might consider,
Drive the vehicle until the problem presents itself, without shutting it down have the dealership check it when while still warmed up.
Now no excuse, they have to see what you mean.