2019 Kenworth T680 / Cummins X15 – Intermittent throttle issue

Are there any codes? First closely inspect the wiring and connections. Run the truck at high idle and wiggle, lightly push/pull on any wiring. If that does not replicate the problem then get a spray bottle of water and spray the wiring and connections to see if you can replicate the issue.

 

You have an intermittent short to ground somewhere in the 5volt supply wire to the throttle pedal sensor supply. You must also check the Kenworth drawings to see if the Throttle pedal 5volt supply is shared with any other devices. Most throttle pedal circuits are dedicated 3 wire twist- Purple- green and blue.

Purple is your supply.


Start by pulling kick panels from below steering column and inspect wiring for all contact point from pedal sensor to firewall. Lots of brackets and braces to rub on. The rub will likely be just thru the insulation or barely touching to ground.

 

Had the same thing happen to my truck, every time the driver stop to put fuel and wash the windshield the tuck won't accelerate and got the CEL. I was able to duplicate the problem by pouring water on the windshield. Had to remove all cable ties and loom and I found the wire rubbing on the engine. You have to do what Goodysnap said check the wires from the Ecm to the Tps sensor.