I have a very similar problem. I took delivery of my Nissan quashkai two days before Christmas. Christmas Eve I needed to go shopping and it came up with gearbox fault stop start fault and a couple of other warning lights. It took the rac five hours to attend to tell me it’s too new to connect to their diagnostic and they will collect it after Christmas to take it to the dealership. No alternative transport available until after Christmas. The car went into the dealership 5 times and they couldn’t find anything wrong. Motobility sent out an engineer who within moments of driving it diagnosed a gearbox fault. Motobility says I can reject the car as faulty because Nissan can’t fix it but they won’t let me have a new lease because my pip award is only till August this year. It’s currently going through the renewal process and they’re saying it will probably take at least 9 months to be decided. I very much doubt I’ll lose my pip allowance but because I haven’t got a minimum of 12 months of award they can’t help me. So because I got a faulty car when I had plenty of award period I now am going to be without a car because I can’t keep the hire car once the car goes. Doesn’t seem fair to me