P0682 Fault Code

P0682 OBD-II Trouble Code Short Description

Cylinder 12 Glow Plug Circuit

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What does trouble code P0682 mean?

The P0682 error code pertains to the glow plug circuit of cylinder 12 in diesel engines. This code indicates that the Engine Control Module (ECM) has detected an issue with the glow plug circuit for this specific cylinder, which is essential for starting the engine in colder conditions.

  • Glow plugs help preheat the combustion chamber to facilitate ignition.
  • An error in the circuit can lead to poor engine performance, especially in low temperatures.
  • It's crucial for maintaining optimal engine efficiency and reducing emissions.

Symptoms

What are the symptoms of the P0682 code?

Drivers may notice several symptoms when encountering the P0682 code:

  • Difficulty starting the engine, particularly in cold weather.
  • Increased white smoke from the exhaust during startup, indicating incomplete combustion.
  • Rough idling and reduced engine performance until the engine warms up.
  • Dashboard warning lights may also illuminate, signaling a problem with the engine or emissions systems.

Causes

What causes the P0682 code?

Several factors can contribute to triggering the P0682 code:

  • A faulty glow plug that has stopped functioning effectively.
  • Issues with the wiring or connectors in the glow plug circuit, such as shorts or opens.
  • A malfunctioning glow plug control module that isn't sending the proper signals.
  • Bad ECM or software issues that may misinterpret the glow plug circuit's status.

Possible Solutions

How to fix P0682?

To resolve the P0682 code, follow these general troubleshooting steps:

  • Begin by inspecting the glow plug and its circuit for any visible damage, corrosion, or loose connections.
  • Test the glow plug with a multimeter to ensure it operates within the specified resistance range.
  • Replace any faulty glow plugs and repair any damaged wiring related to the circuit.
  • If necessary, replace the glow plug control module to ensure proper function.
  • Clear the error code and perform a test drive to confirm the issue has been resolved.
P0682 Cylinder 12 Glow Plug Circuit