What Is P0677 Code On 6.0 Powerstroke? (How To Fix)

The code P0677 causes a number of vehicle owners to be in trouble. Most people don’t know the meaning of this code after finding this from an OBD scan. If you are one of them then this is going to be a very helpful discussion for you.

Here we arrange a discussion on the universal code of 6.0 Powerstroke P0677. Let’s see what is P0677 code on 6.0 Powerstroke? why it comes and how to solve this code. So, without any delay, let’s start. 

P0677 Code On 6.0 Powerstroke

What Does P0677 Code Mean On 6.0 Powerstroke?

Officially the code P0677 on 6.0 Powerstroke means the Cylinder 7 Glow Plug is not working. That means the engine and the cylinder are not getting the service of this set of glow plugs. 

The 6.0 Powerstroke has a number of cylinders. All these cylinders have different components. Glow plugs are one of the most important components of this part of the engine. If the glow plugs of the 7th cylinder stop working then the OBD scan will show the code P0677.

This code is serious enough to take immediate steps to fix this. This code has some vivid symptoms that will assure you about the problem. Let’s see these symptoms. 

Symptoms Of Getting The P0677 Code On A 6.0 Powerstroke

Though the number of cylinders is high enough for a 6.0 Powerstroke engine if one of them stops working naturally then some real trouble occurs. As the P0677 code appears then there will be a number of problems. 

Here are some symptoms of the glow plug not working code P0677 on 6.0 Powerstroke. If you find any of these symptoms then go for a solution immediately. 

  • Check Engine Light On
  • Taking time in Start
  • Misfire While Starting 
  • Less Power Generation
  • Acceleration does not work Properly

Some symptoms of this code are seasonal. They will only appear in the cold. Some may appear in summer but become more serious in the winter season. You have to remember that.

The Causing Factors Of The Error Code P0677

The causing factor of the code P0677 on 6.0 Powerstroke is not huge in number. Only a few things are the cause of this code on your vehicle. Let’s see these causes in short.

  • Damage Glow Plug
  • Poor Connection
  • Faulty Glow Plug Control Module

These are the primary causes of this code on your 7.3 Powerstroke. But there are some more reasons that are indirectly related to this code. We will discuss these causes in the solution section of this discussion.

How Serious Is Code P0677 On 6.0 Powerstroke?

If you want to measure the seriousness of this code on your 7.3 Powerstroke then you have to look at the symptoms of this trouble code on your driving and the behavior of the engine. 

The vehicle will take time to start in the winter season if you have a problem with the Glow Plug on the 7th cylinder. If it takes time or does not start at all then this should be serious code. Because the problem it creates is serious.

Again this code will reduce engine power and acceleration takes time then this is also a very serious problem You may fall in trouble at any time. So, we can say this code is serious enough to fix as quickly as possible.

How To Solve P0677 Error Code On 6.0 Powerstroke?

The solution of this code is very simple and easy. I will show you a complete way of solving this code from your vehicle within a few minutes. This solution will take less money and time too. Let’s see how to solve the P0677 error code from your 7.3 Powerstroke.

If the Glow Plug is Faulty

The glow plug is one of the most complex parts of the vehicle. It has some sensitive components that can face some troubles and it may be damaged. There is a coil inside the plug. That creates heat inside the cylinder. You have to check the glow plug for any fault it has.

To check the glow plugs, you have to take one multimeter. Then you have to check the resistance of these plugs. If the resistance is more than 6 ohms then the plugs are faulty and you have to change all 4 plugs from cylinder 7.

If you remove old glow plugs and replace these with new plugs then it should be okay now. You will check again and the code will not come again.

If the Problem is in Connection

The glow plugs need some electric power to generate heat. If the connection is poor then the plugs will not work properly. They will not be able to generate enough power and the code will appear.

In that case, You have to remove the connection completely. Then you have to clean all the ports of the glow plug control module and battery section. Then replug the connection. I hope the problem is gone now. 

Now check the voltage of the connection. If the voltage is okay then there is no problem anymore. But if the voltage is lower than the expected level then you have to change the wire and connectors too.

If the problem is in GPCM

We know that the Glow Plug Control Module may face some problems. If that is true for your engine then you have to change the GPCM. Usually, everyone has to change this in every 95,000 KM an engine runs.

These were all possible solutions to this code on your vehicle. I hope you get all these. 

How Much Does It Cost To Solve The Error Code P0677?

The cost to solve this code from your engine is not fixed. It may be higher if the problem is in the Glow Plug Control Module. But if the problem is in the Glow Plug itself and in the electric connection then it will be low.

The possible cost will be from $50 to $5000. If you have to change the GPCM then the cost will be around $5000. But if the problem is in the glow plug then the cost will be around $150 to $200. The connection problem will cost you from $50 to $100.

Common Mistakes While Solving The P0677 Code

The most common mistake we make while solving this code is not inspecting everything carefully. If the code appears that means that there is a possibility of a number of causes behind it. So, you have to inspect all the possible causes and then make a decision. 

We also make another mistake. Some of the drivers have no experience on this problem but try to fix it themselves. But this should not be done without proper knowledge. If you are new in this sector then take help from a mechanic.

Additional Comments To Consider Regarding The P0677 Code

Think about your safety seriously. This should get the most priority. You have to wear gloves, and other safety equipment. This will keep you safe.

Some of us don’t want to take this code seriously. They delay even if the code warn them again and again. But this should not be done. They should take it into consideration even before falling into any emergency situation.


I hope you get all the information you wanted from our discussion today’s discussion. That was all about the P0677 code on 6.0 Powerstroke. Be careful about the code and take steps to solve this as soon as possible. Follow all my suggestions and take help from an expert if you feel for it.

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