P0677 OBD II Trouble Code Cylinder #7 Glow Plug Circuit

Symptoms of P0677 OBD II Trouble Code

The engine management computer (PCM) will set the code P0677
The engine will be hard to start or may not start at all in cold weather or when its been sitting long enough for the block to cool.
Lack of power until the engine heats up sufficiently.
Engine may miss due to the colder than normal cylinder head temperature
Engine may hesitate when accelerating
No pre-heat period, or in other words the preheat light does not go off.