What Is P003A Cummins Code and How to Solve it?

What is code P003A? This is a troubleshooting diagnostic code that the ECM detects when there is a displacement of turbocharger boost control. To be more exact, if there’s any problem related to the turbo or supercharger system, you will get a notice.

But, don’t worry! We are saying this because you will be able to solve the issue of the P003a code for the Cummins engine. What you need to do is identify the causes of the problem. Once you know what exactly causes the code to be detected by the ECM, you will be able to fix the problem quickly.

P003A Cummins

Internal turbocharger failureBad fuel efficiency
PCM failureDifficulty starting the car.
Wrong turbocharger vane position sensorEngine power is loose.
Failure of Turbocharger vane control actuator solenoidUsual noise from the turbocharger.

These are the most common causes and symptoms resulting from the P003a code 6.7 Cummins. Look, diagnosing the reasons for any particular issue is always vital. Once you know what actually causes the diagnostic troubleshooting code to occur, you will be able to fix the issue.

As we are talking about the issue regarding Cummins, this may not necessarily match with the other types of vehicles. However, the turbocharger parts mentioned in the column are crucial and need to be fixed ASAP.

Internal Turbocharger Failure

Turbocharger basically consists of many important things. Therefore, all the elements have to work constantly to ensure performance. But, once you drive your vehicle for a long time, there might be some issues.

One of the most common signs that you will notice is bad fuel efficiency. However, the main culprit for turbocharger failure is oil starvation. Besides, there are many causes like wiring issues, the defective boost control system, etc. are responsible for the problem.

Solution: It will be much better for you if you change or replace the faulty turbocharger. Yes, repairing can be a helpful choice for you if you identify the exact problems with the turbocharger.

PCM Failure

You will never see the P003A  14 Cummins code if there is difficulty with shifting the gears. Whatever the problem is, in this case, it is with the PCM (Powertrain Control Module). Therefore, as it works like the central computer system of your car, you need to fix this issue. Otherwise, you can’t remove the code.

Solutions: Once you have diagnosed this cause, you need to repair the PCM. Sometimes, changing the batteries may help you a lot. If the issue doesn’t get fixed with the help of repairs, you should replace the Powertrain Control Module (PCM).

Wrong Turbocharger Vane Position Sensor

If there is an issue with the wrong turbocharger vane position sensor, it will have an impact on the whole turbocharger or supercharger system. If the engine power goes out more frequently, you should consider this a problem with the vane position sensor.

Solution: You don’t need to perform a pretty hard task here. Rather, what you need to do is to adjust the vane position within the turbocharger. Besides, you can also replace this if it totally goes bad.

Failure of Turbocharger Vane Control Actuator Solenoid

If you hear an unorthodox noise from the turbocharger or supercharger, there must be a problem with the vane control actuator. The turbocharger, which produces power for your vehicle’s engine, won’t work properly if the vane control actuator is at fault.

Solutions: The best thing that you can do here is to replace the vane control actuator of the turbocharger. Repairing the actuator may not be possible all the time.

This Video Will Help You Too!

Frequently Asked Questions (FAQs)

How to Fix a P003A Code?

First of all, you need to keep patient. As mentioned above, there are many causes that trigger the code. You should take steps to fix it based on the actual causes. Let’s say the problem is with the internal turbocharger. You may have to replace or even repair it depending on its condition. Adjusting the vane if there is a problem with the vane will also be a better fix.

What Does Code P003A?

This diagnostic troubleshooting code refers to having issues with the turbocharger or supercharger system. It means turbocharger boost control “A” exceeded the limit, to be more exact. Besides, the code also means mismatching the turbocharger vanes. The values are outside the allowable limits in this case.

Can A Turbo Actuator Be Repaired?

It depends on the amount of damage. But, according to many experts, replacing the turbocharger instead of repairing it will be much better. Besides, according to many manufacturers, there is no repair policy. However, the repairing cost of the turbo actuator is also high. So, it’s better to go with the replacement.


Well, we have presented almost every key point about P003A Cummins; it’s time to sum up. But before saying “bye,” the top recommendation that we would like to give is to take the time to fix the code. When you tend to change the elements on the turbocharger, you follow your owner’s manual.

However, eradicating this type of code is not so difficult. You need to follow our recommendations to fix the problem properly. Furthermore, this blog is all about providing you with some ideas about the code. You may also go to the mechanic to fix the issue. He undoubtedly also follows the segment discussed above.

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D Conroy

Meet our senior writer and content manager of Automasterx. He has worked in several mechanical garages and mastered different vehicle diagnoses and parts repair. He never stops until finding out the ultimate solutions for any vehicle fault code. However, ensuring the only solid solutions for each vehicle malfunction is his core part of the duty, alongside analyzing fault codes and signals.

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