I have a 2003 f250 with the 6.0. I got the code a few days ago after it hit the first cold front here in Tennessee. I’ve replaced the glow plug, glow plug harness and even the relay and still can’t get the code to stay clear. I can also finally get it to run now, but it will stall out on its own. Please help if you have any other ideas of relays that control the glow plugs I know the module are relays in themselves on the valve cover on the passenger side. I’ve took a DVOM reader and get .7 ohms at the glow plug through the harness and .5 ohms from the connector to the module.