What Is P0683 Code on 6.0 Powerstroke Engine and How to Fix It

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The Ford 6.0L engine is equipped with a plethora of Diagnostic Trouble Codes (DTCs) to provide users with insights into the engine’s issues. Among these codes, the P0683 code on 6.0 Powerstroke stands out as one of the common ones.

Deciphering the P0683 Code on the 6.0L Powerstroke Engine

In this article, we’ll delve into the intricacies of the P0683 error code, ensuring that you gain a comprehensive understanding of it, from its symptoms to its solutions.

The P0683 code on the Ford 6.0L Powerstroke engine is officially defined as the “Glow Plug Control Module To ECM/PCM Communication Circuit Error.”

Diesel engines heavily rely on extreme compression to generate the heat required to ignite the fuel. However, in cold weather conditions, the engine block may struggle to produce sufficient heat for ignition.

Here’s how it works: The Powertrain Control Module (PCM) monitors the engine’s temperature through transmission and oil temperature sensors. When it detects a lack of heat, usually in colder weather, it activates the glow plugs. These glow plugs generate intense heat for a brief period, aiding in the engine’s startup process.

However, if the PCM fails to communicate effectively with the Glow Plug Control Module (GPCM) to activate the glow plugs, it triggers the P0683 error code.

Recognizing Symptoms of the P0683 Code on 6.0 Powerstroke Engine

Much like other DTCs associated with the Ford 6.0L engine, the P0683 code manifests itself through various observable symptoms. If you notice any of the following signs, it’s highly likely that the error code P0683 is the culprit:

  1. Check Engine Light (CEL) Illuminates: The first and most obvious sign is the illumination of the Check Engine Light.
  2. White Smoke From Engine Exhaust: You may observe white smoke emanating from the engine exhaust, especially during startup.
  3. Difficulty Starting the Engine: The engine may become harder to start, particularly in cold conditions.
  4. Reduced Fuel Economy: The vehicle may consume more fuel than usual, leading to poor fuel economy.
  5. Sluggish Acceleration: The vehicle may exhibit sluggish acceleration, impacting its overall performance.
  6. Engine Stalling: Engine stalling issues may occur intermittently.

While you may not experience all of these symptoms simultaneously, the presence of the Check Engine Light and a combination of the above symptoms is a strong indicator of the P0683 error code.

Common Causes of the P0683 Error Code

Several factors can contribute to the occurrence of the P0683 error code. Here are some of the most prevalent causes:

  1. Damaged Wiring: Open or shorted wires between the Powertrain Control Module and the Glow Plug Control Module can trigger the code.
  2. Faulty Glow Plug Modules: Damaged glow plug modules can also be responsible for the error.
  3. Corroded or Loose Connections: Poor electrical connections, either due to corrosion or looseness, can interfere with communication between modules.
  4. Low Battery Voltage: If the solenoid doesn’t receive sufficient power from the battery, it can lead to the code’s activation.
  5. Defective Control Area Network (CAN) Bus Circuits: Issues with the Control Area Network circuits can disrupt communication and generate the error code.

In most cases, problems related to the glow plugs and the glow plug control module are the primary culprits behind the P0683 error code.

The Significance of Addressing the P0683 Code on a 6.0 Powerstroke Engine

As previously mentioned, when the glow plugs are faulty and fail to provide the necessary heat for engine startup, it can have serious repercussions. This can potentially harm your engine and disrupt your journey. Therefore, addressing error codes like P0683 promptly is not only a matter of convenience but also a preventive measure against more severe engine damage.

How to Resolve the Error Code P0683 on a 6.0 Powerstroke Engine

Now that you understand the gravity of the P0683 code, let’s explore how you can resolve it on your own, provided you have the necessary equipment:

Equipment Needed for Resolution:

  1. Technical Service Bulletin (TSB) for Your Model: Ensure you have access to the TSB specific to your vehicle model.
  2. Scanner (Autohex or Tech II Recommended): A quality scanner will help you diagnose and clear the error code effectively.
  3. Digital Volt/Ohm Meter: This meter is essential for testing various electrical components.
  4. Screwdriver Kit According to the TSB: Having the right tools on hand as per the TSB’s recommendations is crucial.

With the required equipment at your disposal, follow these troubleshooting steps to address the P0683 error code:

  1. Consult the TSB: Begin by referring to the Technical Service Bulletin (TSB) for your vehicle model. It will provide specific instructions tailored to your situation.
  2. Use a Scanner: Connect the scanner to your vehicle’s OBD-II port and retrieve the error code. This will confirm the presence of the P0683 code.
  3. Check Wiring: Inspect the wiring harness between the Powertrain Control Module and the Glow Plug Control Module for any damage, such as open or shorted wires. Repair or replace as necessary.
  4. Examine Glow Plug Modules: Assess the condition of the glow plug modules. If they are damaged, replace them with new ones.
  5. Inspect Connections: Check all electrical connections, ensuring they are secure and free from corrosion. Clean or tighten connections as needed.
  6. Test Battery Voltage: Use the Digital Volt/Ohm Meter to measure battery voltage. If it’s below the recommended level, address the battery issue before proceeding.
  7. Verify CAN Bus Circuits: Test the Control Area Network (CAN) Bus circuits for any faults. Repair or replace damaged circuits.

By following these steps meticulously, you can effectively address the P0683 error code on your 6.0L Powerstroke engine, potentially saving you from more significant engine problems down the road.

In conclusion, understanding and resolving the P0683 error code is essential for maintaining the health and performance of your Ford 6.0L Powerstroke engine. With the right equipment and a methodical approach, you can tackle this issue successfully and ensure your vehicle runs smoothly.

Inspecting and Resolving the P0683 Error Code on a 6.0 Powerstroke Engine (Continued)

Continuing from where we left off, let’s proceed with the steps to diagnose and address the P0683 error code effectively:

Check & Replace Wirings

  1. Inspect Wiring: Begin by carefully examining the wiring that runs from the Powertrain Control Module (PCM) to the Glow Plug Control Module (GPCM) and from the Glow Plug to the Bus Bar. Look for any visible damage such as burnt wires, corrosion, or discoloration. If you find any such issues, it’s crucial to replace the entire wiring setup to ensure optimal functionality.
  2. Check Resistance: If you don’t find any visible damages, it’s time to assess the resistance of the wires. Utilize your Digital Volt/Ohm Meter (DVOM) to measure their resistance. If the resistance value deviates from the range of 0.5 to 2.0 ohms, it’s an indicator that the wiring needs replacement.

Check Glow Plug Modules

After addressing the wiring, shift your attention to the glow plugs themselves:

  1. Locate Glow Plug Modules: Find the glow plug modules; they are typically situated on top of the engine cylinders. Carefully remove all of them.
  2. Check Resistance: Similar to the wiring, measure the resistance of each glow plug using your volt/ohmmeter or multimeter. If you obtain a resistance reading significantly lower or higher than the 0.5 to 2.0 ohm range, it’s advisable to replace the entire set of glow plugs. Why replace the entire set?: When one plug malfunctions, there’s a higher likelihood that others might follow suit. Replacing the entire set is a preventive measure to reduce future complications.

Check Glow Plug Control Module

If you continue to encounter the P0683 error code even after replacing the glow plugs, it’s essential to inspect the Glow Plug Control Module (GPCM):

  1. Locate GPCM: The GPCM should be situated on the engine and has a direct connection to the PCM.
  2. Thorough Inspection: Carefully remove the GPCM and thoroughly inspect it. Look for any visible damages or leaks caused by other engine components. Don’t forget to check the electrical connections as well.
  3. Replacement: If you detect any issues or damages, it’s advisable to replace the GPCM with a new one. Note: Experts recommend replacing the GPCM after every 60,000 miles or 95,000 kilometers of use, even if there are no apparent issues.

Replace The PCM

Should the aforementioned steps fail to resolve the P0683 error code, the Powertrain Control Module (PCM) might be the culprit:

  1. Check GPCM Connection: Before replacing the PCM, check whether the GPCM is receiving power from the PCM. If it’s not, this indicates a faulty PCM that is not performing its function correctly.
  2. PCM Replacement: In the event of a faulty PCM, replace it, and this should resolve the error code P0683.

Cost of Resolving the P0683 Error Code

The cost associated with addressing the P0683 error code can vary depending on the specific replacement parts required for your engine. To provide you with a general idea, here are approximate price ranges for the replacement components:

  • Glow Plug Module Set: $70 to $90
  • Glow Plug Control Module: $120 to $130
  • Full Glow Plug Kit (Includes Harness, Control Module & Glow Plugs): $230 to $250
  • Wiring Replacement: $100 to $500

If you prefer not to undertake the work yourself, you can expect to pay between $75 and $150 at an auto shop to have the issue resolved professionally.

Common Mistakes to Avoid When Resolving the P0683 Code on 6.0 powerstroke

If you’re tackling this repair independently, take heed of these common mistakes to ensure a successful resolution:

  1. Thoroughly Read the TSB: Always read the Technical Service Bulletin (TSB) thoroughly before proceeding with any fixes related to the error code. It provides essential guidance tailored to your specific vehicle model.
  2. Check Glow Plugs & GPCM: Don’t rush to replace the PCM without checking the condition of the glow plugs and the Glow Plug Control Module. These components are often the root cause of the P0683 code.

Additional Considerations for the P0683 Code

It’s worth noting that even if you reside in a region with mild temperatures, addressing the P0683 error code can be beneficial. Occasionally, this code can uncover sensor issues beyond just the glow plugs, albeit rarely.

Conclusion

In conclusion, this article has provided a comprehensive guide to understanding and resolving the DTC P0683 error code effectively. With the right equipment and a methodical approach, you can tackle this issue on your own.

Resolving the P0683 code should not pose a significant challenge, provided that the problem is isolated to faulty glow plugs and the Glow Plug Control Module. However, if you encounter additional issues, it’s advisable to seek expert assistance to ensure the continued optimal performance of your 6.0L Powerstroke engine.

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