Hi All,
I've got a 2001 Accord VTiL 3.0 V6 with a 4 Speed Auto.
The other day while driving on a twisty hilly road, it started to rev up for no reason.

We checked the auto tran's & topped it up a little, but it still revved up.
But it didn't do it on flat roads.

Anyone got any idea whats the trouble?

Thanks, any help would be great.

From Allan in NZ.

 

It's normal for it to downshift to lower gear climbing up hills.

 

Yep, normal. It's the grade logic.

youtube.com/watch?v=rfI3PNz5WgU

 

I think there's some amount of "learning" in that grade-logic stuff. So if you climb a few hills in a "sporting" manner, it'll learn that behaviour & hold lower gears because it "thinks" that's how you like it.

Besides that, customers have been known to complain when the transmission constantly hunts back & forth between 3rd & 4th. So they make it so it holds 3rd.