What does code P0674 mean on a supercharged 2001 Nissan Frontier?

it means that it is going to burn to the ground ASAP!!!!!!!!

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The definition I found for P0674 was Cylinder 4 Glow Plug Circuit/Open. Are you sure that is the right code? I think only diesel engines have glow plugs. Code P0647 is A/C Clutch Relay Control Circuit High just in case you typed it backwards :)