Having a problem with a recurring u 1301 code. I had the bed and bumpers off my truck the past week and a half to paint them. Put everything back together this weekend, cleaned the truck and lightly sprayed down the engine compartment avoiding electronics as much as possible. Ran the truck that day with no check engine light. Went to start the truck the next morning and glow plug light stayed on until I started the truck then the check engine light came on. Read the code showed u1301 cleared code with auto cal and didn't come back the rest of the day or this morning. Truck sat for the day today and when I started it after work the glow plug light stayed on again until I started the truck and light came back. Just trying to figure out what the problem could possibly be. Truck runs and drives fine and everything is working as it should with the exception of the glow plug light. Any help would be appreciated