I have same problem with a Peugeot e-expert van. Apparently the V2V (sp?) converter needs replacing, which I think is probably the 400V to 12V DC converter for the lead acid 12V battery (which has seemed fine). Its a coded part and no one can tell me when it can come. Been off the road now for 3 weeks. Problem didn't stop the car but I didn't want to ignore it when it has a big red flashing and clanging warning saying "Repair Traction Battery". Was the problem sorted for those of you that had it?