No bus

"No bus" is your ECM telling that one of the other computers onboard doesn't wanna talk to the ECM. This is "usually" a wiring/connector problem. Check you wiring/connections, especially under the drivers side kick panel. Do you have access to an engine scanner? If not, go to auto zone or some other local store n get them to "hook u up" n read any active or potential codes.

No codes on it

I found the problem on my 1999 dodge saying no bus it was the transmission plug wires was touching .

took off fuse cover and unscrewed the large plug adaptor cleaned all the pins with contact cleaner and small brush, put it back together and no more trouble

So my 2011 Ram gauge cluster would freak out! I noticed when I would release the parking break it would effect what the gauges were doing. I removed the lower dash panel below the steering column and disconnected all plugs and cleaned with contact cleaner. I also removed and cleaned all the grounds under the hood. Problems solved! No more wipers turning them selves on, gauges turning off and all the lights coming on the dash!!

Ive Got the no bus code on me as well I'm going to Change out the Gauge cluster and replace the fuse Box under the hood Because it is eaten up with corrosion

Hey man since all of this happened I found a green connector that was the problem for me. Open ur drivers door, there is a removable almost triangle shaped panel that covers the left side of the dash. To the left of the steering wheel, u will see a green connector behind it. I played with it while the truck was running and was able to recreate the error. I disconnected the plug, cleaned the connectors and used an electrical anti seize (Nolex) or grease on the connection. It actually solved the problem man. Good luck!!

mi RAM 1500 2000 5,2 NO BUS un golpe a la pc y se arregla ,coloque 5volt en el cable positivo del actuador en el cuerpo de aceleracion y asunto arreglado

to make long story short im having the same issue. im still checking the whirring but noo make a loticed that when truck cooled a bit it reset. and started so i limped home. started again in the morning. ran and drove for about an hour got home and died. disconnected pcm cluster to check connection and postes reconnected pcm and truck started ran for 5 min and quit i thought to check ecm temp at 130 deg. can the ecm be overheating ?