[SOLVED] P0684 Code: Fixing Glow Plug Control Module Communication Circuit Range/Performance

If you’ve noticed your engine light is on, or you’re experiencing a lack of power, difficulty starting your engine, or engine hesitation, you may be dealing with fault code P0684. This code is typically caused by a faulty Glow Plug Control Module (GPCM), an open or shorted GPCM harness, a poor electrical connection in the GPCM circuit, or a faulty Engine Control Module (ECM). To fix this issue, start by visually inspecting the wiring harness and connectors, checking for any damaged components or broken, bent, pushed out, or corroded connector pins.

This repair is of moderate importance and difficulty, with an estimated repair time of 1.0.

Repair Importance Level10.0 (Out of 10)
Estimated Repair TimeApproximately 1.0 hour
Repair Difficulty Level10.0 (Out of 10)

I know how frustrating it is to see that warning light pop up again and again. You don’t need to spend money at the mechanic just to clear it. With this pocket-friendly automatic car scanner, you can do it yourself in seconds and and avoid the time and inconvenience of driving to a mechanic. Just plug it in, connect to your Android or iOS phone, and instantly see live data. Understand the fault code, clear it right away, and decide if it’s something urgent or if you’re good to drive. It even monitors your car and sends notifications to your phone, so you’re always in control. Simple, fast, and stress-free—today’s offer price!

Experiencing the p0684 fault code?

Look out for symptoms like engine light on, lack of power, difficulty starting, and engine hesitation.

  • The symptoms of the automobile fault code p0684 include: Engine Light ON (or Service Engine Soon Warning Light), Lack/Loss of Power, The engine may be harder to start, and Engine hesitation.

The automobile fault code p0684 can be caused by a faulty Glow Plug Control Module (GPCM), an open or shorted GPCM harness, a poor electrical connection in the GPCM circuit, or a faulty Engine Control Module (ECM).

  • The fault code P0684 can be caused by the following: a faulty Glow Plug Control Module (GPCM), an open or shorted GPCM harness, a poor electrical connection in the GPCM circuit, or a faulty Engine Control Module (ECM).

Do you know you can clear most fault codes—but some could mean serious danger? Don’t take chances with your safety or your family’s safety. This budget-friendly car scanner makes it easy to clear fault codes in seconds while showing you exactly what’s wrong. Plug it in, connect to your Android or iOS phone, and instantly check live data. You’ll know if it’s a minor issue you can clear or something serious that needs attention—so you can drive safely and stress-free. (Today’s Deal)

To fix the p0684 fault code, start by visually inspecting the wiring harness, connectors, and components for any damage or corrosion.

  • To fix the automobile fault code p0684, start by checking the possible causes mentioned above.
  • Then, visually inspect the wiring harness and connectors related to the issue.
  • Look for any damaged components and check if there are any broken, bent, pushed out, or corroded pins in the connectors.
  • This fix typically takes around 1.0 hour to complete.

The automobile fault code P0684 can be diagnosed and fixed within an estimated repair time of 1.0 hour. The cost of the repair will depend on the hourly rate charged by the auto repair shop, which typically ranges between $75 and $150 per hour.

The P0684 fault code refers to a communication issue between the Engine Control Module (ECM) and the Glow Plug Control Module (GPCM). The ECM is responsible for monitoring the GPCM, and when it cannot establish communication with it, the P0684 code is triggered. This code indicates a problem with the communication circuit range or performance between these two modules.

It is important to address this issue promptly to ensure proper functioning of the glow plug system in your vehicle.

What are the symptoms of the automobile fault code p0684?

If you’re experiencing the symptoms of the automobile fault code P0684, such as the engine light being on, a lack or loss of power, difficulty starting the engine, or engine hesitation, the cause could be a faulty Glow Plug Control Module (GPCM), an open or shorted GPCM harness, a poor electrical connection in the GPCM circuit, or a faulty Engine Control Module (ECM). To fix the issue, you should visually inspect the wiring harness and connectors, check for damaged components, and look for any broken, bent, pushed out, or corroded connector pins. Don’t forget to check the “Possible Causes” listed above for further guidance.

What are the possible causes of the p0684 fault code?

If you’re experiencing symptoms like the engine light being on, a lack or loss of power, difficulty starting the engine, or engine hesitation, the p0684 fault code could be the culprit. This code is often caused by a faulty Glow Plug Control Module (GPCM), an open or shorted GPCM harness, a poor electrical connection in the GPCM circuit, or a faulty Engine Control Module (ECM). To fix the issue, visually inspect the wiring harness and connectors, checking for any damage or broken, bent, pushed out, or corroded pins in the connectors.

How can the p0684 fault code be fixed?

If you’re experiencing symptoms like the engine light being on, lack of power, harder starting, or engine hesitation, the p0684 fault code might be the culprit. This code is usually caused by a faulty Glow Plug Control Module (GPCM), an open or shorted GPCM harness, a poor electrical connection in the GPCM circuit, or a faulty Engine Control Module (ECM). To fix it, visually inspect the wiring harness and connectors, check for damaged components, and look for any broken, bent, pushed out, or corroded connector pins. Don’t forget to check the possible causes mentioned above.

p0684 error fault code explained

If you’re experiencing a lack of power, engine hesitation, or difficulty starting your engine, along with the engine light being on, it could be due to a faulty Glow Plug Control Module (GPCM) or issues with the GPCM harness or circuit connection.

To fix this, visually inspect the wiring harness and connectors for any damage or corrosion. Check for broken or bent pins as well.

Scroll to Top