Gauges going dead when gas petal is pressed

Type "qualcomm" in search box and read some of my previous, lengthy posts.

 

Different circumstances, but may be related to your issues.

I have a 2005 Freightliner M2 Box Truck with Mercedes Engine that was giving me some problems this week. The engine would start and run, but had either a too low or much too high idle speed. Also the temp and oil pressure gauges, tach and throttle pedal would not work making the truck undriveable. It seemed to me that the engine and truck were not communicating. I checked every fuse, relay and module connection I could find. I checked the engine computer, the bulkhead module, all the firewall connnectors, everything I could think of. I was told by a tech to look at the C3 connector on the frame mounted Chassis module under the cab I did not know was down there. The connectors were all clean and tight. While it was running in the limp state, I had a hunch to tap on the chassis module with my flashlight. First tap, the truck hiccupped and everything smoothed out. So there is a loose connection or some flaw inside the chassis module causing all my frustrations.

Just wanted to share in case it helps someone else out.