How to Fix the P0261 DTC Code on a 6.0L Powerstroke (Solved)

DTC (Diagnostic Trouble Code) P0261 on 6.0 Powerstroke is stored due to a fault in the injector circuit cylinder 1. It is a generic code and may appear at any time while driving. When the code appears, the first thing you should do is to ask what the code means.

The code P0261 on the 6.0 powerstroke means PCM has detected a lower voltage than the manufactured specified range in the cylinder 1 fuel injector. Since this particular code on powerstroke 6.0 is associated with a fuel injector, which injects fuel inside the cylinder, P0261 is considered severe and requires immediate attention.

We will go over every bit of detail, including its causes, symptoms, and fixing strategies. Keep Going.

How to Fix the P0261 DTC Code on a 6.0L Powerstroke

What Does p0261 Code Mean On 6.0 powerstroke? 

To reiterate, P0261 on 6.0 powerstroke indicates a fault in the injector circuit cylinder 1. Let’s describe the code in a bit broader sense.

In case you are wondering how PCM works, it is the brain of the vehicle that manages various components of the vehicle, such as the transmission. 

These components are equipped with sensors, and PCM identifies the voltage from these sensors and compares it with the manufactured reference voltage.

When PCM finds an inappropriate voltage from the respective sensor, it stores the code. So when the PCM detects an inappropriate voltage from the injector, it stores the code. Here is the breakdown of the code P0261.

  • P = Powertrain 
  • 0 = It is a generic code that derives from the SAE
  • 2 = It indicates the parts associated with the fault. In our case, it is the cylinder 1 injector.
  • 02 = It indicates a specific fault index. In our case, low voltage is detected at cylinder 1 injector.

How Serious Is Code P0261 On The 6.0 Powerstroke?

The code P0261 on 6.0 powerstroke should be considered severe. When the fuel injector does not operate at its optimum, it could result in a lean mixture.

 Changes in the air-fuel ratio result in either more fuel or more air in the combustion chamber, both of which are detrimental to the engine. 

When the lean mixture is detected, it produces a ripple effect. Additionally, the fuel economy drops.  

Also, an inappropriate air-fuel mixture can cause the cylinder head temperature to increase, resulting in detonation.

What Causes Code p0261 On 6.0L powerstroke?

The causes of the P0261 code on 6.0L Powerstroke are not very difficult to find out. Locate cylinder 1 and injector circuit 1 and inspect a few things. Hopefully, the cause will appear. 

Here is a list of the common causes the code is stored. Checking and resolving them will solve the problem.

  • Check if the fuel injector is defective
  • A fuel injector can also be plugged 
  • Check every connection and wiring harness 
  • Wiring between the injector and PCM or ECM
  • Faulty PCM
  • Due to a corroded fuel injector connector

Other Symptoms Of Getting p026 Code On 6.0L powerstroke

The most obvious symptom of the code P0261 on the 6.0L Powerstroke is the illumination of the check engine light. Well, the symptoms are not so obvious and may overlap with other problems. However, you may have the following symptoms.

  • The engine will run rough 
  • A lack of power 
  • Fuel economy may reduce

How To Fix The p0261 Code On The 6.0 Powerstroke?

When it comes to fixing the code, your approach should be to find out the root cause of the code. Once you have the cause, repair is not that tough. To find the cause, you have to diagnose the system. 

Another fact is which approach to follow. You can either follow the DIY approach (Do It Yourself) or find an expert you trust.

Although the DIY approach is a little difficult, you can save money that would have otherwise gone into the mechanic’s pocket. One word of caution, though: if the issue is electrical, a professional will be better able to handle it. 

Notes: For a comprehensive wiring diagram and all other necessary details, refer to the service bulletin specific to your vehicle. Online research and professional advice are other options. The note is for those who prefer to handle the issue themselves.


The diagnostic phase varies according to the make, model, and year of the vehicle. The actions we will describe below are only intended to give you information. Usually, when a mechanic performs repairs, they do the following.

Scan the System and Clear the Codes

It is a common step that experts take. It shows the fault codes and freeze frame information, which reveals the state of the car while the code is being stored.

Next, clear all the codes. Once an expert has deleted all the stored code, they test drive the vehicle. After that, they rescan the vehicle to see if any of the deleted codes return. 


A few things need to be fixed or replaced. If the injector is faulty, replace the  injector. As we’ve already mentioned, if the wiring harness is loose or corroded, it needs to be replaced as well.

However, if the injector and wiring harness are both fine, all that is left to do is install the FICM, which is a common practice among Ford owners. A replacement is required when the FICM has failed to control the injector.

1. Repair or Replace the wiring Harness and Connectors

Most often, if not always, loose wire or poor electric connection in the injector plays a major role in this code appearing. In addition, it can also be due to the dirt that makes the injector dirty and plugged.

When you do visually inspect the area look for if there is any loose wire or corroded connection in the injector. Check the blade of the injector and ensure it is not bent or defective. Correct all the defects, and hopefully the code will no longer appear.

2. Check the injector and replace it if necessary

A fuel injector requires electricity that comes from the relay. When the engine is on, the PCM ensures the injector has the electricity to run properly. If you close your ears to the engine, you will probably hear the clicking noise of the injector. 

If there is no sound, most probably the injector has failed or there is no power to the injector. So use a voltmeter to check the relay or check the wiring of the electric source of the injector. You have to replace the injector for a faulty one.

3. How to Replace the PCM on a Powerstroke 6.0?

The Powerstroke 6.0 PCM replacement procedure is outlined in the following step-by-step guide.  However, for a thorough wiring diagram, we advise consulting the service manual.

  • Step 1: Disconnect both the battery cables 

Disconnect both negative battery cables before moving on to the next step. Remove the driver-side positive battery cable as well. You will need an 8 mm socket.

  • Step 2: Locate the PCM

After removing the battery, you can access the PCM, which is mounted on the driver-side fender.

  • Step 3: Disengage all the connector

Next, disconnect every PCM connector. In this case, connectors are typically clips. Once you release the clip, pull the connector.

  • Step 4: Remove the PCM

After all the connectors have been taken out, just take the PCM out. Additionally, the firewall and grille both have two 10 mm sockets, and the bottom of the PCM is held in place by a tiny clip.

  • Step 5: Examine Everything

Examine all of the wiring from the three connectors before removing the PCM. It is important to note that these wires may be damaged; in that case, complete wiring repairs should be made before replacing the PCM.

  • Step 6: Reinstall the PCM

Next, you must perform each step backwards in order to reinstall the PCM. Both the clip and the battery cables should be reinstalled. Your PCM is ready to go.

How Much Does It Cost To Fix The 6.0 Powerstroke P0261 Code?

The cost of fixing P0261 on 6.0 Powerstroke depends on the severity of the issue and several other factors. 

So, accurately estimating the cost is tough. On the other hand, you will save a lot of money if you handle the problem yourself.

In addition, the mechanic will charge up to $150 per hour for the diagnosis. If you want them to do the repairs for you, add the cost of the replacement parts. 

Check the latest price of injectors, wire, or FICM, since the cost changes from brand to brand.

Can You Drive Your 6.0 Powerstroke With Code p026?

As long as the injector of 1 or a maximum of 2 cylinders is defective, you can drive for a while. 

Try to avoid driving if more than 2 injectors are defective. Faulty injectors cause a sharp decrease in fuel economy.

In addition, a faulty injector may result in a lean mixture, which produces a ripple effect. 

Also, an inappropriate air-fuel mixture can cause the cylinder head temperature to increase, resulting in a detonation. So avoid driving.


By now we have tried to cover every bit of detail about the P0261 code on Powerstroke 6.0. Here are some frequently asked questions that you might want to know.

What Is The Maintenance That Can Prevent The P0261 Code On Powerstroke 6.0?

Just like other maintenance, regular maintenance may stop the code from reappearing again. Cleaning the injector, especially after replacing fuel, keeps the internal component of the injector intact and prevents it from breaking. 

What Is The Common Mistake People Make After The Code Is Set?

People think most often, if not always, fuel injectors have to be replaced. However, there can be some other simple reasons for the code. One such case is a circuit failure. Even something as simple as a loose wiring harness or connector could be the reason. Therefore, make sure you know the exact reason and take the necessary steps.

What Does “Injector Circuit High” Mean?

There are a few scenarios, the injector circuit is low. On the other hand, it can be high. A high injector circuit means the draw is greater. 
When the PCM is getting voltage from the injector circuit from cylinder 1, it is getting high voltage. In both cases, it indicates that the injector circuit is not working properly.

What Other Codes Are Related To The Code P0261?

As you know, a powerstroke 6.0 comes with more than one cylinder, and each cylinder comes with an injector. 
The fault code that describes the cylinder 1 injector will not be the same as the fault code that describes the cylinder 2 or 4 injectors. Here are some codes related to P0261 that you must know.
P0261 injector 1 control circuit low, P0262 injector 1 control circuit high P0264 injector 2 control circuit low, P0265 injector 2 control circuit high, similarly P0267 indicates 3 rd injector and low circuit. The list goes on until the last cylinder.


Before we pack up, a little important advice for you. The Powerstroke 6.0 fuel injector issues change the delicate mixture of air and fuel that causes detonation or engine misfire and reduces fuel economy.

Never put off taking the necessary action when the PCM sets the code and you have the symptoms mentioned above. There is a chance that the engine will sustain additional harm as a result of multiple defective injectors.

And never panic if you see a code; in Powerstroke 6.0, this is common. Determine its underlying cause and make the best strategy for making it vanish and stay gone for a very long time.

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