Hi Folks. I am looking for some direction with my no bus issue. I did a cab swap on my 02 2500 4x4 24 valve automatic trans. I just bought the truck and did notice the fuel gauge was acting up before hand but didnt notice anything else but then again I bought it as a project and got right to work. After I got it back together, I would get a few gauges acting up and every 3rd or 4th keystart, I would get a no bus message. Here is what I have now pretty much with every keystart -  No Bus message, Alternator not charging, None of the gauges are working, Starts off in 2nd gear - Limp Mode?,  no communication with code readers, O/D off selector not working, dash warning lights on, codes 920, 921, 999 on the odometer. I checked the voltage on the #3 and #11 pins of the OBD connector and have 2.44 on pin 11 and 2.45 on pin 3. I understand this is a communication error between modules and could also be an issue with the cluster as well but would like to know where to go from here.

Any advice or direction would be greatly appreciated!

Thanks!

I just did the PCM grounds on my truck a few weeks ago as i was having an issue with my torque converter not unlocking when letting off the gas pedal.  I will tell you when I finished and got in the truck to fire it up and back it out of the garage I had the "no buss" on the cluster.  I went and checked my connections and somehow I didnt get a good crimp/solder and one of grounds pulled out.  I fixed that and everything was good.  No more torque converter issues either.  Fixing those grounds is no joke! 

 Glad to hear you finally got her back on the road! That's great!

 Those ground issues are a serious thing, even more so with an automatic trans.  When dodge engineered that they were not anticipating these trucks longevity. With the cummins engine and proper maintenance along with some modifications to the wire harness they will run a very long time. There are a few other factory short falls but most of us have fixed those by now also.