Technical Definition:

(Cylinder No.12) Glow Plug Circuit / Open

Technical Description:

The diagnostic trouble code (DTC) is a generic powertrain code. It is considered generic because it applies to all makes and models of vehicles (1996-newer), although specific repair steps may be slightly different depending on the model.

Possible Causes:

• Faulty cylinder #12 glow plug
• Open or shorted glow plug circuit
• Damaged wiring connector
• Faulty glow plug control module

Possible Symptoms:

• 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.

Cylinder 12 Glow Plug Circuit Fault

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty cylinder #12 glow plug
– Cylinder #12 glow plug harness is open or shroted
– Cylinder #12 glow plug circuit poor electrical connection
– Faulty glow plug module

Specific Makes: