Quote Originally Posted by alleycat_42 View Post
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I fully understand the transmission and know it is anordinary 4 speed, with no overdrive. The same transmission is found onall Aveo’s made from 2004 to 2010. The problem is that there are a lot of thesecars out there running around in a maximum 3rd gear no matter what speed youattain. This is very hard on the engine and car overall because of the excessiveRMP. If you choose to switch the ignition key on and off quickly while drivingdown the road at anything over 40 MPG it will trick the transmission into shiftinginto 4th gear. This is a temporary fix since GM has no fix and can be usedwithout hurting anything on your car as far as I know. Since running around athighway speeds and 4000 RPM is a little hard on gas feel free to give it a tryon your Aveo if you’re having the same problem as most Aveo owners. You will bepleasantly surprised at the new lower gas consumption and lower heat that yourcar runs at.
Cheers
Brian
If the transmission isn't going into fourth gear, the cause should be pretty easy to establish. It's either the transmission itself or the TCM. You shouldn't have to resort to the process you suggested to make it work. Later models are covered by a five year warranty. I've gotten warranty work done on my 2009 when it was necessary. But it helps to know how to state your case to the dealership effectively, such that they will not give you a runaround.