There's a disco party on the dash

First off new to the forum and I'm really pulling my hair out here.

I am currently working on a 2012 Coronado with a DD13. When the truck is cold and you turn the key on (engine off) the Regen lights, check engine light, wait to start light, and the abs light flash on and off and not neccesarily with eachother. When you attempt to start the truck so long as the wait to start light doesnt come on before the engine fires it will start. Once you start the truck all of the lights continue to flash. On a road test the truck will "derate" when the wait to start light comes on and returns to normal when the lights goes out. When the truck derates the speedo goes to zero and all the other gauges operate as they should. The drivers says once the truck warms up it doesnt do anything although I cant seem to make it stop. Any help at all would be awesome.

 

Snowwy. Thanks for the reply. I forgot to mention the regen. The truck absolutely would not regen from the dash. Never tried a forced regen with the laptop as I had a hunch I was chasing other issues and the DPF particle count was really low when I checked it.

As always as soon as I turn for help I stumbled across it. There is a CPC module that controls the cab and on these trucks is in the center of the dash on the floorboard under the plastics. We have a new truck that hasnt been put into service yet and I switched them and the problem is no more. Now I have to do the warranty paperwork.... Bleh

One last thing I forgot to mention is I work in a shop and am certified by Freightliner since the company I work for buys so many to do all of the warranty work. I know I am screwed when the dealer guys in Fresno have been telling me I dont know for two weeks. haha

Thanks again for your help.