Throttle Pedal Problem

99.999999% chance the ECM is fine. About the only things that'll kill an ECM is if moisture gets in it, someone smashes it with a hammer or it gets zapped with high voltage.

 

What is the truck doing? TPS going in and out, making the truck buck really hard? Mine went out and my truck started accelerating like crazy. I killed the engine, hit the shoulder, started her back up and the TPS was bucking hard. If and when that happens, foot off the throttle, turn the cruise on, and use the accel switch to accelerate. Major holiday and all the shops were closed, but I ran the truck for 3 days on the accel switch.

 

Sounds like you need a new shop. They should actually troubleshoot the problem instead of just throwing parts at it while you pay for it all. I would also make them pay for the tow bill as well.

 

look at the back of the valve cover to see if the big wire loom is touching the valve cover.its common issue with the cummins.the harness will rub against the valve cover and cause short in the wires and cause this issue and many other.had this similar issue on buddy of mines peterbilt 387.good luck!!

 

Did you ever figure it out?

 

Did you figure this out?

 

99% of the time, it is the wiring between the ECM and throttle pedal sensor including the terminal pins. Unless something obvious is found, sometimes it is just better to run new wires and be done with it.