What exactly triggers P1400?

[Stoopalini]

If I swap an OEM PCM out for an HP Tuners unlocked PCM, but both have the exact same OS and calibrations loaded ... will it trigger a P1400?

Or is P1400 triggered when the PCM is flashed ... or when it is swapped with a different PCM containing a different software version loaded on it?

[N2speed]

Its triggered when the boot loader is changed for unlocking.

[Stoopalini]

Gotcha, that's helpful ... thanks!