Just a thought. I put new GPs in my LB7 and i also replaced the controller. I still got the code. I went back to the glow plugs and i did get one of them tight enough. It was pretty tight. I was worried about over tightening them that wasnt the case. The lose one was hardly considered lose but it barely jiggled in its spot. Im thinking mine was the P0380 code if i recall. I hope its that easy for you. It took me about a week to find this. Good Luck
2004 Chevy 2500HD LT CCSB 4x4 213,XXX miles, Glow shift Pillar Gauges Pyrometer, Boost gauge, PPE boost valve, PPE High Idle switch, Merch Auto welded water pump, PPE coolant hoses, Mishimoto thermostats, 4"RCD LIFT, 35" TOYO A/T XtremeII, Bilstein 5100's, 4" Magna Flow Cat Back, MBRP CAI, Stage III trans, PPE Stage 3 Tie Rods, Sinister coolant filter kit, Powerstop Brake kit F&R, Firestone bags, Accuair on board compressor w/ 3 gallon tank. #whitetrucksmatter
1967 Camaro "Drive it like you stole it".