Need some help. 2000 Durango RT 5.9. It sat for a while and I got it running. It does have transmission issues but was running before the no bus. It sat for maybe a month after I got it back running and just refused to start with no bus code. Sat for 4-5 months after code and was able to get it started one day randomly but kept stalling and eventually just quit starting again. No good scan reads because its not allowing me to. O2 sensors replaced last year. Ecm replaced last month. Still no bus. I cleaned the grounds and retightened them. I've unplugged the main sensors to see if no bus goes away and it doesn't. I haven't had a chance to unplug the o2 sensors to see if maybe one just messed up or the fuel pump. Any help is appreciated.

 

Fuel pump won't cause a no-bus. That is one of those error that is rather difficult to figger out. Usually, it's just a bad sensor on the 5 volt circuit, of which, the O2 sensors are famous for. (especially the rear sensors....)

See what you are missing when it won't start. Does the fuel pump prime? Do you get power to the coil, and injectors for a few seconds at initial key on? Do you get spark? Injector pulse?

 

So as far as I can tell the fuel pump doesn't prime or anything. Due to this i haven't even checked the injector or fuel rail. Kinda why I was thinking fuel pump. The o2 sensors are the only ones I haven't unplugged to see if no bus goes away. I replaced them less than a year ago so I was wishful thinking they hadn't gone bad because they absolutely suck to deal with. Guess that'll be the next thing I do though.

 

It may be the wiring, not necessarily the sensors themselves.

Do you get power to the coil for a few seconds at initial key on?

 

Will have to check when It gets done raining here.

 

That time of year......... at least it isn't snow.