Hi Rob, I do not have a GT1 to check the codes, used a Carsoft scanner but did not pick up that code.
What I did was at the aircon repair shop hook up the pressure dials and checked tha tthe fan was not activating when it was supposed to, even though we picked up a voltage signal going to the fan.
I understand that universal fans wont work because of the fan speed required. dunno wat the CFM is supposed to be though.

Anybody with deep technical on this?