P0671 Isuzu -

Question

I have a 2006 chevy duramax. showing the code p0671. I have replace the glow plug in #1 cylinder cleared the code and it cam back on. truck runs and starts fine. wires seam to be ok???

Answer 1

P0671 Cylinder 1 glow plug control circuit

You really have to make sure the connection is screwed down, if it is not properly making contact  it would code P0671, it can also be a open circuit for the glow plug.P0671 - P0678 what cause these are are ofter high resistance (loose connection) short to ground ( faulty glowplug) or a short to voltage ( harness issue).