Did you just dyno the truck? Or power brake? (or God forbid, get stuck?) Mine did the exact same thing after dynoing at Georgia Diesel. Makes sense. The front tires are stationary and the rear tires are spinning probably 70mph or so. Sensors go ballistic. I was told it should go out after several key cycles or driving some distance. I cycled the key switch probably a dozen times as well as cranking and shutting off the truck. That didn't fix it. After the event, I drove out (the driveway is over 1/2 mile long). Once I turned on the blacktop road, everything was normal again. I don't know if the key cycles AND the driving did it, or if it was just the driving. Anyway, if you were spinning the rear tires for whatever reason, that will cause it to do exactly what you have stated.