How to Fix P00AF Code On Cummins? (Everything Explained)

The Cummins engine is known for being one of the most reliable and efficient engines on the market today.  However, the secret ingredient that makes it possible is its picture-perfect DTC (Diagnostic Trouble Codes) alert functionality, such as for the P00AF code. So naturally, you will wonder, what is code P00AF mean on Cummins engine?

In short, code P00AF indicates that the turbocharger is not functioning properly on the Cummins engine. This is a serious issue because the powertrain control unit (PCM) detects a problem in the control module of the booster; hence the error message is generated.

Thus, this article will teach you how to troubleshoot potential symptoms and fix issues that cause code P00AF.

What Does P00AF Code Mean On Cummins?

As we mentioned earlier, P00AF is the OBD-II code for noticing a faulty boost control module traced within the supercharger or turbocharger of your cummin engine.

That is also known as the ‘Turbocharger Boost Control Module Performance”. Here’s an analysis of the P00AF code’s connection to this problem:

  • P = Powertrain, the system of elements that push your automobile onward (In this case, the turbocharger).
  • 0 = a generic number derived from the SAE standard
  • 0 = Fuel, air metering, and auxiliary emission controls
  • AF = Specific fault index (In this case, it denotes a possible problem detected close to the system circuit)

A significant internal issue can cause this P00af OBD-II code with the ECM, or it may indicate a problem with your wiring connection.

How Serious Is P00AF Code On Cummins?

The P00AF code on Cummins is considered to be a highly serious situation for the engine and should be addressed immediately. Although you can continue to drive your vehicle, it’s strongly recommended not to as it can severely damage your brokers as well as pushrods.

The code is triggered when the turbocharger has increased its overspin near the vane at its maximum speed, causing the engine to run at a higher RPM than it normally would.

If you notice this code when your Cummins engine is running, it is best advised that you stop driving and seek professional assistance immediately. The turbocharger could fail completely and leave you stranded on the side of the road without any means of transportation.

What Causes P00AF Code On Cummins?

The problem in the hand of the P00AF code on the Cummins engine is that it can differ based on the specific model as well as the vehicle. So, we have provided a list of noteworthy causes down below. They are –

  • Corrosion can result in a heightened level of resiliency due to connectors pins, grounds, connectors, etc.
  • Internal issues that are related to ECM (Engine Control Module).
  • In excess, the soot output accumulates in the chargers’ vanes, resulting in boost levels at high or low or incorrect levels.
  • An issue is with wires such as frayed electrical short, open, short ground or ground, etc.
  • Issues with the electronic turbo actuator
  • Issues with the boost control module.
  • Control solenoid sabotaged boost such as lever stuck, broken, bent, etc.
  • Leaks within the exhaust pipe.

How To Fix P00AF Code On Cummins?

P00AF code can have multiple fixes depending on the issue that surfaced or the vehicle’s engine structure. Thus, to solve the common OBDII code P00AF problem, follow the step-by-step guideline:

Step 1: Uncover the source issue

The problem of code P00AF differs on the model and vehicle in hand. So, the potential trigger can be plenty from wiring, ECM, etc. Accordingly, locating the specific problem is crucial.

Step 2: Keep a constant eye on the boost control actuator

This step will focus on precision and balance as forced induction application forms a powerful heat. The heat can easily peel off or burn your skin if you’re not careful.

Therefore, you need to constantly watch the boost control actuator to make sure mechanical operation is up to par.

Step 3: Transfer the levers individually

Even though transferring the levers from the actuator directly into the location of the chargers isn’t always an option. It’s the ideal situation.

If you can’t find the location, look closely at the solenoids with the help of flexible levers. Keep in mind that this can deviate depending on the manufacturers.

Step 4: Make sure the module is water-free

In this final step, it’s crucial to make the module water-free. Primarily due to the module’s connection to a group of boost controls. Also, put back the assembly and corrosive conditions to their perfect state if any presence is detected.

Finally, repair the wires if they are damaged via the high temperature of the turbocharger.

Other Symptoms Of Getting P00AF Code On Cummins

Here are some of the other symptoms that could be caused by a problem related to the engine code P00AF:

  • The “Check Engine” light is on.
  • The turbocharger doesn’t produce enough boosts.
  • The vehicle is in slow mode.
  • Extreme engine noise.
  • The hardship of driving uphill.
  • Power levels that are fluctuating or low.

How Much Does it Cost to Fix Cummins P00AF Code?

On average, the price will come in between $150 to $1,800, depending on the car’s problem. If the problem is with your turbocharger/supercharger, then it will require replacement to solve it.

You can purchase a new turbocharger/supercharger for around $1500 and have it installed by a professional mechanic for around $75 – $120 per hour.

On the other hand, if the problem is with your vane, then replacing it will cost you around $80 – $150. Finally, if the issue is related only to the connection, it will come to around $100 – $200.

Can You Drive Your Vehicle With code P00AF?

Yes, you can drive your Cummins affiliated with code P00AF.  In fact, you can drive it as long as the light is on but keep in mind the code itself is deadly for the vehicle.

The problem with driving a truck with code P00AF is that the code is indicative of a problem with the powertrain control module (PCM). In addition, this specific issue was caused due to the overuse of the vane residing in the turbocharger/supercharger. 

So, the constant usage can lead to severe damage (because of high heat) to other components inside the engine, such as rockers or pushrods.  On the other hand, the PCM controls all of the engine systems in your truck except for fuel injection. Thus, if there’s an issue, it could also cause many problems for you on the road.

To sum it all up, if you see this light come on, get your truck inspected immediately by a qualified mechanic.  Afterward, the mechanic can confidently tell you if your truck needs immediate repairs or slight wire connection adjustments.


In a nutshell, code P00AF indicates that the turbocharger is functioning at a high intensity because of the vane’s high spin. So, prolonged use can severely damage the rockers, pushrods, and fuel pumps because of extreme heat.

Hence, it is in the driver’s best interest to immediately seek professional help from an experienced mechanic. Because the possibility of the engine dying after 30 minutes after the code shows up is super-likely.

As we mentioned earlier, depending on the issue we are dealing with, it can cost us somewhere around $150 – $1800.  However, if the driver waits too long to fix the issue, we are looking at hundreds to thousands of dollars worth of extra repairing money, adding to the overall bill.

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