Hello, I am having problems with a 2013 vision, as soon as you start it,it is showing that you are going 25 mph and after a few seconds idling it rev upto 2600 rpms and 100mph for a couple seconds and idle will go back to normal but speed stops at 25 again. If you barely tap the gas pedal it will do it again. I you put it in gear speed drops back to zero but put it back in neutral revs up shows 100 and puts on mileage as if it were moving. I have cleaned all the ground connections as I find them,disconnected alternator, unplug rear speed sensor it wont do it. Any other ideas about this crazy bus.
The bus still goes into gear and drives. When you do shift into forward or reverse it shifts hard. When you go from forward or reverse to neutral it will do the rev up and speedo goes to 100mph. Have been checking all connectors i can to look for problems.
I hooked upto the Allison doc program and when looking at the trans input speed and turbine speed they look normal about 780 but the output is showing 1150 when it should be at 0. Does this sound like a computer failure. when you barely press on the excelerator pedal and the engine revs way up the output speed on the computer goes up over 4000rpms and the speedo shows 100mph but the bus is still parked with the brakes on in neutral.