jamesroessler

Yes definitely single wire. A friend of ours has the exact same year and his is single wire also. We put our pcm on his and it works perfect so that’s why I’m guessing Ecm??

I replaced the cam sensor with Cummins part and still has this issue. Ohmed the bus wires from ecm to pcm and they are good. Oil pressure switch is single wire going to ecm with 4.9 volts but the code shows oil pressure switch low voltage? Could this be an ecm issue?

My son has a 2002 Dodge 2500 Diesel has codes P0522 and P0336. The oil pressure switch, which is a single wire switch, has been replaced with a Cummins part and the PO336 code is troubling because there is no crank shaft sensor on a 2002. When you start the truck the instrument cluster shows no oil pressure and the tach is erratic for 8 seconds then drops off and the truck runs at a normal RPM but is in limp mode. ANY help would be appreciated.