I pulled the fuse on mine and it went into limp mode. I have a short of some sort with mine it will be off when i turn the car on and not come on when i hit the switch. I have had it then come on after i staged so i wanted to disable it. What i ended up doing was unplugging one of the wheel sensors that throws a code and disables the system but does not throw it into limp mode. I think you may be having a different issue maybe KR, torque management? hard to tell when there are no logs of the run.