How do you test a glow plug controller on a Duramax?
To test your glow plugs, simply connect a 12-volt test light to the positive battery terminal. Then disconnect the wires from each of your glow plugs and touch the probe of the test light to the terminal of the glow plug itself (not the wiring harness).
What is code P0678 mean?
What the P0678 code means. The P0678 code is a generic OBD-II trouble code indicating a problem with the glow plug circuit in cylinder number 8. Glow plugs are used in diesel engines to help warm the engine to aid ignition. The powertrain control module (PCM) helps control this heat.
What is a glow plug circuit?
The glow plug control unit uses a glow plug relay to switch the current for the glow plugs on and off. The more glow plugs monitored by a control unit, the higher the current the circuit will need. To reduce the current needed, glow plugs are often distributed across two circuits, with two glow plug relays.
Where is the glow plug module on a 2011 Duramax?
Locate the glow plug controller to the driver side of the turbocharger near the firewall.
What causes glow plug failure?
Usually, glow plug failure is due to excessive heat, or high voltages reaching the plug. High voltage can be caused by a controller that is starting to go bad. Additionally, if there is faulty wiring, or a problem with the controller, the glow plug(s) may be receiving power all the time.
Does a glow plug module need to be programmed?
Yes it will need to be programmed from a GM tech II scan tool.
How do you unplug a glow plug module on a Duramax?
Locate the glow plug controller to the driver side of the turbocharger near the firewall. Remove the glow plug power feed connector (round connector, left side of glow plug module) by pressing the two ridged segments of connector shell and pulling away from and out of the glow plug module.
Will bad glow plugs throw a code?
usually yes. never seen one with a bad plug without a code.
What does the code p0677 mean on a glow plug?
The code P0677 tells you that something in the glow plug circuit is faulty causing the glow plug on cylinder #7 to fail to heat up. The entire circuit must be checked to locate the fault.
What are the symptoms of a p0677 engine 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
What are the OBD-II check engine light codes for the Duramax?
OBD-II Check Engine Light Trouble Codes for the Duramax below: P0100 Mass or Volume Air Flow Circuit Malfunction. P0101 Mass or Volume Air Flow Circuit Range/Performance Problem. P0102 Mass or Volume Air Flow Circuit Low Input. P0103 Mass or Volume Air Flow Circuit High Input. P0104 Mass or Volume Air Flow Circuit Intermittent
What does the code p0107 mean on a pressure sensor?
P0107 Manifold Absolute Pressure/Barometric Pressure Circuit Low Input P0108 Manifold Absolute Pressure/Barometric Pressure Circuit High Input P0109 Manifold Absolute Pressure/Barometric Pressure Circuit Intermittent P0109 Intake Air Temperature Circuit Malfunction P0111 Intake Air Temperature Circuit Range/Performance Problem