I have a 2001 Dodge ram 1500 V8 5.9 4x4 220,000 and I'm currently having a no bus. I have gone through everything unplugged every sensor with no change. I have checked wires I'm getting power from the PCM into the PCM. I have changed the fuel pump I've changed the crankshaft position sensor the PCM is from 2020 I have a remanufactured transmission with 5,000 mi on it. When testing the fuel pump I inadvertently crossed 85 to 87 at the relay and everything clicked on and the no bus went away I did test the pump and it is operating I'm out of options I don't understand what's going on hopefully somebody can help lead me in the right direction.

 

Does it start/run/drive properly?

Usually, that's just a bad sensor. O2 sensors are famous for causing that......

 

Yes normally it does start run and drive properly I took it out on a Saturday a couple weeks ago It was running just fine I went to load a stove in the idle got really bad and then it just stopped running I did change the idle air control valve and inspected it I did not check the O2 sensors I will do that.

 

That did it crawled underneath the truck check the O2 sensor come to find out the connector was melted along with wires after fixing that truck started and ran great Thank you for your help.

 

Way COOL! Gotta love the easy/inexpensive fixes.