Looking engine code for po677 on 2007 durmax?

Question

I drive a chevy 2007 2500hd durmax diesel. While driving today the engine light came on. When I checked to see the error code number it was po677, can you tell what it means?
I have checked engine and transmission for correct oil fluids.

Answer 1

P0677 Cylinder # 7 glow plug control circuit

This code condition is more likely will be a shorted glow plug on the # 7 cylinder, It is the glowplug controller that detected that the circuit is open.