Speed up a vehicle does not work

[A.F.]

Hi,
I have tried the CA in 2.7.
It's a great thing to drive around the airfield with a Jeep!

But:
After I stopped in front of my Tomcat and got into the plane via F10, I wanted to get back into the jeep via F10.

This also worked, but I could not speed up the vehicle.
I have connected my left rudder pedal for it.
The first time it still worked. But after I came back from the tomcat, it didn't work anymore.
All attempts failed - bind another controller, key "w", dcs restart - nothing worked.

Does anyone have a solution