I just had a local shop change my water pump, hoses, thermostat, etc.

I removed the MM3 from the truck for safe keeping.

Prior to taking the truck in my MM3 read my fuel rail pressures.

I drove the truck for about 50 miles after picking it up from the shop, no problems noted.

However, now that I have hooked the MM3 back up the fuel rail pressure readout is showing NA (I assume Not Available).

I do not have a clue where to start looking with this problem.

No CEL and the truck is running fine.

This morning I will unplug the MM3 from the OBD port, and all connections and then plug them back in?

I have been searching but have not found any viable info regarding this problem.

Any info or guidance would be appreciated!

Thanks!

Travis