Interesting Transmission Hiccup

[Munch520]

This is a long shot but thought I'd check with the hive...

So yesterday I was driving around, roughly 40mph in 'normal' mode. I gradually eased into the throttle while changing lanes to pass, the car took a minute to downshift so I gave it a little more juice and it finally kicked down.

I then lifted off as I had passed and was at a good speed, this is where things got weird. The car started to slow (car did not upshift after I lifted off the gas) and the revs held. This lasted for a couple seconds before the car violently upshifted. So violently that the tires chirped and there was a pretty loud 'thunk'.

Before and after this happened it's been driving 100% normally, in all modes and when using manual/paddle control or in full auto. No CELs or anything like that.

I can't get the dealership to reproduce things that are easily reproducible so I don't hold out any hope that I'll be able to show them what happened. So anyone else had this happen? Anything you'd recommend?

 

[Alwaysforward]

Had similar issue over a year ago. It was at the same time my car needed the tail light seal issue fixed on a recall. The dealer chalked it up to that because it was linked somehow to the wiring for the tranny. Ever since they did that recall I have not had the issue. I don't think the recall was the fix but it hasn't happened again since.

 

[GenesisX]

It's happened to me twice now. Both times I thought I was rear-ended by another car.

 

[Munch520]

Interesting, glad I'm not alone! And glad I got the extended powertrain coverage haha.

Hopefully it's just an unrefined moment and not doing any damage to the tranny.

 

[Munch520]

It's happened to me twice now. Both times I thought I was rear-ended by another car.

Definitely, it feels like being rear ended at low speed. Like in a parking lot or something.

 

[CanukV6]

I had a similar experience: http://genesisowners.com/hyundai-genesis-forum/showthread.php?t=19241&highlight=Transmission

 

[Munch520]

Thanks for that, I still won't bother with dealership. I'll swing by the local O'Reilly and have them scan it to see if there's a code that's not throwing a CEL.

 

[G530]

Well, I've been hazed by the Genny tranny 'thump'. Normal driving 30 - 40 mph. when we experienced violent tranny shift that felt like car got rear ended. Quite alarming. Is this an early tell tale sign?

Subscribed.

 

[jarred52]

Well, I've been hazed by the Genny tranny 'thump'. Normal driving 30 - 40 mph. when we experienced violent tranny shift that felt like car got rear ended. Quite alarming. Is this an early tell tale sign?

I had this happen to me once early on in my ownership but it has not happened again.

 

[Bunkei]

It has happened to me too ... revs hold after lifting off throttle, and then a violent upshift with a thunk afterwards. I think it's a software issue, and pretty sure we'll see a TSB before long.

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[Munch520]

I still need to get over to O'Reilly and have them scan it. I doubt anything will pop but who knows!

 

[Gunkk]

1st gen 8 speed can be made to do this too. Never had this with the 6 speed in the '09. It's obviously a bug in the TCS module code.

To reproduce (not recommended):
Floor the gas and run the tach up past 5k (in 2nd or 3rd) ... lift off 1 second, then get on it full again.... and... BOOM!

Fantastic way to break your car.