P0680 Fault Code

Cylinder 10 Glow Plug Circuit

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0680 code refers to an issue with the Cylinder 10 Glow Plug Circuit in diesel engines. This code indicates that there is a malfunction within the system responsible for preheating the air in the combustion chamber for optimal engine start and operation. Proper functioning of glow plugs is crucial, especially in colder conditions, to ensure efficient combustion and prevent hard starting issues.

What are the symptoms of the P0680 code?

Common symptoms associated with the P0680 code may include:

• Difficulty starting the engine, especially in cold weather.
• Rough idling or misfiring.
• Decreased fuel efficiency due to incomplete combustion.
• An illuminated check engine light on the dashboard.
• Increased exhaust emissions, as a result of inefficient combustion.

What causes the P0680 code?

Several factors can lead to the P0680 code, including:

• A faulty glow plug in cylinder 10.
• Poor electrical connections or wiring issues in the glow plug circuit.
• Faulty glow plug relay or module.
• Issues with the Engine Control Module (ECM) which may misread circuit conditions.
• Excessive carbon buildup or engine wear affecting glow plug performance.

How to fix P0680?

To resolve the P0680 code, consider the following steps:

• Inspect and, if necessary, replace the faulty glow plug in cylinder 10.
• Check the wiring and connectors for any signs of damage or corrosion and repair them as needed.
• Test the glow plug relay or module, replacing it if it's not functioning properly.
• Clear the fault code from the vehicle's computer and test the system to see if the code returns.
• If needed, update or replace the Engine Control Module (ECM) if it is determined to be malfunctioning.