Hi, I need help?

Hello I am a brand new member and I have a problem, I steam cleaned the engine of my Discovery 3 diesel today and 50 yards down the road it lost gears (its an auto) the light on the dash for lo range is flashing constantly and the car won't select hi or lo range so therefore it won't select a gear, Have i done something with the steam washer? What can i do ?

I think the steam cleaner will be ok but if in doubt return it to the manufacturer.