Ok I started a thread a week or so ago about my issue. So I have a P0672 glow plug #2 circuit failure, I changed out the glow plug last year and the wire harness for it cleared the code but the code still comes up. I have ohm tested all the glow plugs from the GPCM and they all ohm out between .9 and 1.3 except for the #5 GP i get no reading. I am getting ready to replace the passenger side GP and new wire harness. I did a voltage test on the FICM and that was at 47V with KOEOff then went to 48v with the engine running and no dropping in voltage when starting. I have some cold start issues when its below like 45 degrees. So I am lost on where to go with this code. Could really use some advice on this.

Thanks

 

Got the issue figured out.