I have a descent handful of tunes under my belt but this is something I haven't seen before. The vehicle is a 2002 Trailblazer that has been converted from the straight 5 or whatever to an LS1 and runs off of a 98 PCM, I think the PCM is from a camaro. Anyway, this truck goes into open loop anytime its in gear and the brake pedal is depressed. It stays in closed loop if its in park and you push the pedal and goes back into open loop immediately when the pedal is released. So to summarize
In park - brake not applied - closed loop
In park - brake applied - closed loop
In drive - brake not applied - closed loop
In drive - brake applied - open loop
Is there something in the tune that controls this that I'm not aware of?