'''P189C''' is a problem with your transmission which can't build up enough pressure. You should check your '''fuses''' first. Unfortunately I can't tell you which fuses you have to check, but I think it was a '''30A''' fuse. If all of them are undamaged it may be a problem with some '''faulty wiring''', '''bad connections''' or even the whole '''Mechatronic Unit'''. But even if you find and fix the problem yourself, you still need to clear the faults from your transmission control module so it is advisable to visit an authorized service station.