Allison 5sp: Reverse pressure switch performance

[WolfLMM]

Mike, I got a brand new GMAX trans from SC. It has been throwing a reverse pressure switch code. I thnk it's a p1713? Been doing it randomly since the install. Fluid level checks perfect. Triple checked it.

 

[Mike L.]

Check the o ring on the pressure switch manifold. It will be the one on the end all by itself. Very easy to have that o ring slip out of place. The manifold may be faulty also. It can be checked with a scanner hooked up. Monitor the reverse pressure switch with the key on and switch in your hand. depress the little screen with a pencil eraser and see if it come on and off while watching the screen.