So my new truck has been having a problem particularly when cold. When shifting from 1st to 2nd it would shift up and down quickly a couple times and then continue through the gears normally. I had a tps code at one point and talked to a local transmission shop and they mentioned it could be the throttle position sensor. I hooked up the shops scan tool and noticed the old sensor would only read to 87% not 100% when throttle was all the way down. I bought a new tps and replaced it along with the apps learn. It worked at first kind of but only got to 91%.
I took it for a drive. It did not solve my hunting issue so I looked down at the scanner and now the tps was reading 0% only. This is confusing as I would think if the tps was reading 0% the truck would not drive but it did as normal. Any wisdom here would be appreciated.
I did the same as @Threadzywith no problems.
This may help you understand how the transmission shifts.
From @Dynamic 11/6/2015
You basically have two different pressures at work
So my new truck has been having a problem particularly when cold. When shifting from 1st to 2nd it would shift up and down quickly a couple times and then continue through the gears normally. I had a tps code at one point and talked to a local transmission shop and they mentioned it could be the throttle position sensor. I hooked up the shops scan tool and noticed the old sensor would only read to 87% not 100% when throttle was all the way down. I bought a new tps and replaced it along with the apps learn. It worked at first kind of but only got to 91%.
I took it for a drive. It did not solve my hunting issue so I looked down at the scanner and now the tps was reading 0% only. This is confusing as I would think if the tps was reading 0% the truck would not drive but it did as normal. Any wisdom here would be appreciated.