I actually called our Cat guys here to go out. They reset ECM, but engine still in limp mode. They checked it out and found a pin on Throttle no good but did confirm to customer that only E36 code was stored. I also explained that I was only going on with code that was showing. I guess this was one of those "rare" moments where the ECM did not throw out a code for throttle signal but also lift wasn't used once problem happened. I did disconnect battery while replacing regulator and sensor hoping code clears by the time I'm done. Thanks for reply