"No Bus" what is wrong and how can I fix it?

I had this problem got a used cluster to fix it

I have a no bus message where the mileage should be. All the dash hands arn't working and all the warning lights are on. Truck still runs great but the brake lights and turn signals arn't working and the radio controls on the steering wheel arn't working. I have a hand held scanner but it dosnt' link up with the no bus message on.

Great call, I took the car to the dealer and they to do just that cost me $430.00 but at least it works.

Truck starts and runs. Have no gauges, no headlight control (headlights and taillights are on as well as idiot lights) no control for cruise, radio control (in steering wheel) overhead console not working, no overdrive control, no ac, wipers, fog lights. ABS. What does work is power windows, door locks and yes even with remote (after market) radio, interior lights, door ajar chime, key in chime. Have tried everything that I know battery disconnect, joining positive and negative cables together, checked self test on instrument cluster and it passed, all fuses checked and passed.

Thanks KASEKENNY1. I have many more questions but for now I guess what I need to know is where the modules that I need to test are. I guess I am going to need a wiring diagram and wire color codes? I am asking as I live on a disability income that does not give me a lot of extra income so I have to plan for any major purchases. If you could help you will have my eternal gratitude.

Okay, this is a update. Showing code p1698. Have removed and cleaned all connections on fuse block and still showing No bu5. Have removed dash and will check for bad connection. Needed to take break. Will update soon.

Okay. Checked and cleaned dash connections and still showing no bu5. Guess I will check wiring harness now.
Just wondering if I run a jumper wire from scanner plug to dash on computer (violet) wire if it will give me my dash gauges back? Also I have to walk to service station as I think truck is out of fuel. LOL cause it sputtered and shut off now all I get is it turning over. I guess It pays to keep fuel tank full.

Howdy, , I have a similar issue as others I have read here with a twist. When starting the truck when cold I get the no BUS message in the instrument cluster. I understand it mean there's no comm in the CAN BUS. Now here's my twist, if I drive five miles to my local gas station and put gas in the truck and restart it my gauges will work. Though I have the ABS and brake light still on. Different issue I believe. The truck doesn't stall or run poorly. I swapped out what I thought was the PCM and it didn't change anything. The module I changed was the one on the passenger fender with one large connector on it. Is this the PCM? Or is it the TCM? I have and other Module at the same height as the one described but it's on the passenger firewall with three wire connectors on it. What is this module? I replaced the VSS in the rear end and still have the ABS and brake lights on in the dash. It has been suggested I replace the ABS control module, but I want to get the no bus error fixed first. It was also suggested I may have a ground issue. I cleaned the negative cable connections and replaced the braided engine ground with no effect. All connections inspected so far have been clean and tight. Ram 1500 SLT Quad cab if it makes a difference.

I'll put the instrument cluster on my list of parts to get. I still don't know which control module is which. I also still can't reconcile the warm up issue. Engine heat shouldn't reach the gauges. It may reach the modules or wiring.

Update. I think I may have found the problem in the CTM. I was reading the service manual that I downloaded and found a page that describes what is going on in my truck to a T. Just do not know how to add it here.

Okay, I noticed that the third brake light is working, as are the reverse lights. The turn signal lights work on dash but not on the front or back lights.