Hi, my Roomster which starts and runs well has developed an annoying problem when travelling longer distances. After a journey of about 5 hours, the glow plug lights comes on. The car continues to perform normally. Sometimes it will go out after the vehicle is stopped and restarted. Other times is doesn't. When I get it home and put the reader on it throws a 07397 P245400 A circuit Low error. If I simply clear the DTC, the car will be absolutely fine until the next long journey. This issue is that my wife is uncomfortable driving it with a warning light. Does anyone know what would cause the "A" circuit error and how to resolve it. Thanks in advance.

Did you ever fix it?