Dash not working, no crank, no power after hitting a bump

Hi Powers,

Sounds like you lost your PCM power feed or ground for the PCM. If you lose your PCM then this will keep everything from powering up as you describe. However, the best way to diagnose something like this is to try to replicate hitting the bumps by doing what is called a wiggle test. Basically start at the PCM and have someone sit in the truck with the key on and see when you wiggle the harness that everything flickers or comes back on. You do not want to really manhandle the wiring. Again you want to replicate what the wiring would do when you hit the bumps. They are not going to move much so just wiggle them gently.

You want to go in strategic pattern because when you move the part of the harness that makes it come back on you don't want to be moving so fast that you don't know which place it was. Once you get the system to come back on, it doesn't always go back off if you wiggle it again, so you may only get one shot at it. If you are moving to fast you may not know where the issue is.

I attached a ground location for the PCM. Looks like it is on the top left of the engine. This may be the one you are looking for because it is a pretty common ground.

Let me know what you find and we can go from there.

Thank for the reply. That makes sense. Unfortunate thing is doing the wiggle test wouldn’t have helped you because you lost power permanently. Glad you found it. Thanks for using us as a resource.