Sudden power loss like derate... no codes

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Mhcetrucking, Nov 12, 2019.

  1. Mhcetrucking

    Mhcetrucking Bobtail Member

    Nov 12, 2019
    So I have now had my 2014 Peterbilt 587 at the dealership 3 times for the same issue. Sometimes after applying the break to a stop, then taking taking off, my truck will absolutely fall on its face once I get to 6 or 7th gear. At first I was afraid that my turbo was going but my boost is fine. This is typically accompanied by an abs or traction control light and the code on the dash reads abs and adaptive cruise fault...... yes it has the bendix system.... I hate it. Anyways, the dealership replaced the break pressure sensor twice and it kept happening. They have now replaced the entire throttle pedal assembly and it is still doing it. I have driven truck that have gone into derate for after treatment issues and it feels the same but never with something like this. It’s obviously electrical in nature and the computer is telling the truck to cut power because when I shut off and recycle the truck it goes away but then always comes back within a day. The dealership is at a loss and so am I. Any ideas?
  2. jed222

    jed222 Bobtail Member

    Nov 14, 2019
    Traction control will derate if it thinks any wheel is spinning it will pull the throttle out of it the traction control light flashing is telling you the wheel speeds don’t match so thinks the truck is spinning and pulls throttle back
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