Hi,

I have an AVEO5 2010 LT and I have got a problem with it.

It seems that at 2500 RPM the car can't up above and a heavy sound is emitted if I don't hard press the accelerator. If I hard press the RPM grow up with a regular sound .

The GM dealer doesn't find any problems after 1,5 hours of observation. There is no check engine light.

I opened a call at GM for that.

Do you have any ideas of the cause ?

Thanks.