What Is P00AF Code On Dodge Cummins? (How to Fix It)

This is a general powertrain error-detecting code (DTC) that most OBD-II automobiles will have. Although the procedures are basic, they may differ based on the year, make, model, and powertrain arrangement.

Turbochargers, superchargers, and any other forced induction (FI) system, for that matter, utilize engine energy (exhaust pulses, belt-driven screw-type, etc.) to increase the amount of air that can be supplied to the combustion chamber (increased volumetric efficiency).

The letter “A” might be used to differentiate a connection, wire, circuit group, or other items. The manufacturer’s specs, however, are the finest reference you may have for this. When the ECM detects a failure in the boost control system, it displays the check engine light (CEL) with P00AF and similar codes.

When the ECM (Engine Control Module) identifies the “A” boost control module behaving improperly, the P00AF DTC is set (outside of the normal range).

What Does P00AF Code Mean On Dodge Cummins?

The “Turbocharger/Supercharger Boost Control A Module Performance” diagnostic trouble code (DTC) P00AF stands for “Turbocharger/Supercharger Boost Control A Module Performance.” Whenever the powertrain control module (PCM) identifies a possible fault with the boost control module, this error code is generated.

Instead of referring to a specific component or symptom, the “A” in this error code might be referring to a potential issue in a certain area of the system circuit.

This code is frequently set in contemporary motor vehicles with variable geometry turbocharger (VGT) systems (e.g., Cummins-powered trucks). The PCM employs an actuator in VGT systems to regulate and control the turbocharger and the amount of boost it delivers.

Because it’s a digital platform that interacts with the PCM through a data network, the actuator is referred to as a “boost control module.”

When an internal issue is detected by the actuator, it alerts the PCM. The PCM then illuminates the check engine light and records the code P00AF.

Symptoms of Getting the P00AF Code on A Dodge Cummins?

The PCM employs an actuator in VGT systems to regulate and regulate the turbocharger and the quantity of boost it delivers. Cummins utilizes a simpler VGT that rotates a center shaft to mechanically shrink or expand the turbocharger.

If you drive a car with a recorded issue code P00AF, you may observe the following symptoms:

  • Engine light illuminated.
  • In limp mode, the vehicle.
  • Power levels that are erratic or low.
  • The turbocharger isn’t producing enough boosts.
  • Drivability issues.

The Causing Factors of the Error Code P00AF

The following are possible causes for the P00AF code:

  • Boost control solenoid that is defective (e.g. lever stuck, broken, bent, etc.).
  • Corrosion results in a high degree of resilience (E.G: Connectors, pins, grounds, etc.).
  • A problem with the wiring (e.g. Frayed, open, short to power, short to ground, etc.).
  • Internal problem with the ECM (Engine Control Module).
  • Excessive output soot in charger vanes, resulting in boost levels that are stuck at high/low/incorrect levels.
  • Problem with the boost control module Leak in the exhaust system.

How Serious Is Code P00AF on Dodge Cummins?

While a vehicle can continue to run after the P00AF code has indeed been detected, the greater flexing of the vane within the turbo- or supercharger may cause damage to other components such as push rods or rockers.

As a consequence, driving a car with the P00AF code activated is not suggested, and you should seek professional assistance in discovering and repairing the issue before the repair costs skyrocket due to growing damage.

How to Solve P00AF Error Code on Dodge Cummins?

Troubleshooting the P00AF code’s underlying cause might be tough, notably if you have minimal auto repair equipment and knowledge. In most cases, enlisting the help of a professional for accurate identification is preferred. The steps to solve the code are given here:

Step 1- Code P00AF must be handled as soon as possible to avoid engine damage. However, because this code has so many potential triggers, pinpointing the actual source of the problem may be challenging.

It may be found in a variety of vehicle makes and models. It may have comparable origins and symptoms to other DTCs. However, because automobiles change based on the manufacturer, this code does not have a one-size-fits-all solution.

Step 2- It is vital to remember that forced induction systems create a significant quantity of heat and will severely burn your skin if you are not properly shielded and/or the engine is cool. Having said that, find the boost control actuator visually.

Typically, they are attached directly to the charger; however, this is not always the case. When you’ve found it, ensure sure its mechanical operation is up to par. This is critical since it regulates your charger and boosts settings mechanically.

Step 3- It’s a positive indicator if you can individually move the levers from the actuator to the charger housing. However, keep in mind that this may not be feasible on all systems.

I’ve seen similar solenoids with adjustable levers that assist in finding the “perfect” location. Of course, this differs greatly across manufacturers, so do your homework first.

Step 4- Depending on your arrangement, the module might be connected to the boost controls. Let’s say as a group. If this is the case, be sure there is no evidence of water entry. Any trace of corrosive environment, and the assembly (or, if feasible, only the module) must be replaced.

Take special note of the harnesses leading to the boost control actuator. These are channeled in direct range to a potentially harmful level of heat. The majority of the time, heat damage will be seen early in the diagnostic procedures.

How Much Does It Cost To Solve The Error Code P00AF?

The price might range from $150 to $1,800. Expect to cost around $1,500 if you need to change the turbocharger. If, on the other hand, the problem is with the vane, the cost will be from $80 and $150.

The connection problem might cost you between $100 and $200.

Common Mistakes While Solving the P00AF Code

The following are the most common errors made by technicians while resolving the P00AF OBD-II issue code:

  • Failure to inspect the turbocharger or supercharger mechanical repair work.
  • Failure to validate the P00AF OBD Error Code.
  • After completing repairs, the P00AF error code is not removed.

Additional Comments to Consider Regarding the P00AF Code

VGTs originally debuted in the early 2000s, with the earliest VGTs being controlled immediately by the ECM/PCM. The VGT in Duramax and Powerstroke engines is nearly identical, with a unique oil piston that controls the vanes using engine oil pressure.

When the exhaust vanes twist, the turbo moves faster yet functions like a shorter turbo. When the vanes release, the turbocharger spins slower yet performs like a bigger capacity turbocharger.

Cummins employs a simpler kind of VGT that rotates a central shaft to physically change the size of the turbocharger.

Later VGT-equipped engines feature a specialized VGT module that regulates the design of the turbocharger depending on its CAN bus connections with the ECM/PCM.


The severity of a P00AF code ranges from mild to severe. A problem with your car’s forced ignition system might cause significant harm to the underlying engine components. After receiving this error code, it is in your best interest to get your vehicle evaluated by a specialist.

I hope our conversation today gave you all of the knowledge you needed. When it comes to the P00AF code on a Dodge Cummins, it was all there was to it.

Take care of the code and attempt to fix it as soon as possible. Follow all of my advice and, if required, seek professional help.

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