Hey There Fellow Diesel Lovers. I have a 1996 chevrolet k2500 Suburban with 110,000 miles. my service engine soon lamp has turned on and I ran the code, p0380 So I changed the glow plugs. The light still stays on even after i cleared the code with the scanner. I am guessing maybe it is the glow plug relay? I needed new plugs anyway, everything on the truck is original except the batteries and starter. Any Ideas ? your help would be greatly appreciated.