Sorry if this is in the wrong place, but just seeking some advice. I have a 2014 grand c max automatic, and I have had a transmission fault come up. It seems to take a little while to warm up and the fault pops up, but after about 5 minutes of driving and then turning the car off and on again it seems to sort itself and drive without any issue. When you drive your B-Max, if you notice the car jolting or juddering when you change gear, this is a sign the gearbox has developed a fault. If the issue is extensive, the gearbox may need replacing, but a repair can likely be carried out instead. On average, gearbox repairs cost £297.88 when booked through WhoCanFixMyCar based on our data. hiuRpH.