@Traction
Yeah, your may have a G89, they were phased out in '06 apparently, but if the car has up to rev L on the climate, then it only thros the error because the G89 isn't on the car. They seemed to make do without it, but the climate thinks it should be there, so flags the error.
These photos show the climate part number, mine is actually a Rev B, and then the error code.