Hi everyone. I'm new to the forum and have what might be an expensive problem with my 2014 Insignia 2.0 cdti (only 36k miles under its wheels). Yesterday it suddenly started ringing bells and telling me the engine was overheating and I need to stop immediately. I stopped and gave it 30 mins to cool. When started again it gave the same alert. So now I left it 4.5 hours and tried again. At first it wouldn't start then did with clouds of white smoke and making a sound like a bag of spanners being rattled. Next move was to get it towed to my local garage. My thought was water pump failure leading to head gasket failure. However the garage says it isn't overheating and the gasket and pump appear fine. Also no coolant loss. They say something serious is wrong with the injectors and it seems to be running on 2 cylinders but they don't do diesel engines and don't really know what is going on. They did say they thought it was serious/ expensive!! Does anyone have any idea what this problem might be? Can an injector issue be linked to false overheating warnings and white smoke? Any help appreciated.