I have a allison 6 speed push button and it is showing the do not shift and locking in gear not allowing shift have done the reset and problem continues light even comes on in Nutural at idle what are the problems that can be checked am pulling the pan to change fluid and filter which need it..any suggestions would be appreciated..

 

You might call destroked.com they put Allison's behind cummins all the time. Or put this in the Chevy section most of us 1st gen guys don't know anything about fancy pants push button slush boxes