How to Fix P2201 Code On Cummins? (Completely Explained)

DTC trouble codes are helpful. Most people think of them as the start of a calamity. However, what they ignore is the fact that it is only when these codes flash that they will be able to prevent another catastrophe.

The P2201 is one such trouble code. This code can be triggered only when the amount of NOX produced has exceeded the predetermined amount. The ECM usually sets this amount in correspondence to the sensors.

So, are you interested to know more about this P2201 code? Well, you are in the right place to do so. In this article, we will be covering everything that you would need to know regarding this code on Cummins.

P2201 Code On Cummins

What Does Code P2201 Mean On Cummins?

P2203 is a part of a series of DTC codes that usually flash in a car when they want your attention regarding a specific problem.

To recap, the P2201 is one such trouble code. This code can be triggered only when the amount of NOX produced has exceeded the predetermined amount.

Before getting into how to fix the problem precisely, you must first comprehend what the code entitles you to.  Below, we have given you a full breakdown of this P2201 code.

  • P = Powertrain, the system of components that propels your car forward.
  • 2 =refers to fuel and air metering standards
  • 2 = Barometric Pressure Circuit High Input
  • 01 = Specific fault index (In our case, this refers to faulty nitrogen input in the sensors that exceed a pre-recorded value)

How Serious Is The Code P2202 On The Cummins?

When it comes to a high-performance vehicle, even a single sensor can prove to be vital. The P2202 code flashing on your Cummins can be a severe issue.

While it doesn’t affect how you drive, it will affect the gas coming out of the car, including the fuel usage. That is why professionals advise drivers to immediately respond whenever the code flashes.

If you do not fix the code as soon as possible, this could increase the severity as the damage could spread to other components.

It is known that if left unattended, the entire system will cost a lot of money to replace and fix.

What Causes The P2201 Code On Cummins?

Like any other DTC code, the P2201 has several root causes that can surface along with continuous warning flashes.

We have compiled and listed some of the more common problems you could find out as the root cause behind the P2201 code.

  • Sensors have broken down or short-circuited.
  • The NOx sensor connectors have corroded.
  • The sensor was faulty to begin with
  • The ECM needs to be reprogrammed
  • The pins connecting the NOx sensor to the system are bent.

How To Fix P2201 Code On Cummins

There are several steps involved in fixing the P2201 code issue. We have stated the entire step-by-step procedure below. You can read it and then follow through however you like.

Step 1: Diagnosis

Use an OBD-II scanner to scan the area of any issues related to trouble codes.

If the scanner reveals nothing, you can move on to observe the NOx sensors and catalytic converter mechanically. Look for damaged wiring, out-of-place components, and faulty connectors.

Step 2: Replace Or Repair Sensor Wiring

If you find wear and tear on the wirings used for the NOx sensor, you will need to patch it up. If you can’t patch up the wires, replace them with new working ones.

Step 3: Fix The Connector

The connectors can bend over time. Once bent, they will not work properly. As such, you will need to hammer the connectors into place. If you are unable to do so, install new ones.

Step 4: Replace the sensors or converter.

If you find the entire network of NOx sensors or the catalytic converter to be affected, you will need to replace them entirely. You can do this by disassembling the old components and screwing on the new ones.

Even when repaired, these components will never work the same way they used to in the past. You will never get the top performance from the NOx sensors and catalytic converters unless you install new ones.

What Are The Other Symptoms Of Getting A  P2201 Code On Cummins?

If the P2201 code flashes in your car, there are several other symptoms that you might experience. Below, we have listed some of the most typical symptoms associated with the P2201 DTC on Cummins.

Note that while we have listed some of the moon ones, it doesn’t necessarily mean that you will be experiencing these symptoms.

  • Increased emission of hydrocarbons
  • Excess smoke from the exhaust
  • Fuel economy is highly inconsistent or high
  • Erratic idle state
  • Gas released increases the pollution in the environment

How Much Does It Cost To Fix Code P2201 On Cummins?

The typical amount of money you will spend on fixing the code P2201 can be broken down into two main categories.

The first one is the cost of parts. This involves the total amount you will be spending on the hardware like wires, gears, connectors, etc.

If you replace a few wires and small components, the most you will be paying is about 50 USD. On the other hand, if you are required to replace the entire convertor, it might cost you as much as 900-1200 USD.

Additionally, you will also need to take the cost of labor under consideration. This is usually about only 80 USD but can differ depending on the area of expertise of the mechanic.

Can You Drive Your Cummins With The P2201 Code?

Yes, you can drive your car while the P2201 code persists. However, do not that you will not enjoy driving your vehicle in this state as much as when the functions are all normal.

Additionally, driving while the condition persists isn’t eco-friendly at all. This is because this condition causes the car to release a more significant number of hydrocarbons than usual. As such, the pollution in the air will increase.


You should have already understood how to resolve the P2201 code in your Cummins. While the issue associated with the code doesn’t affect the car’s engine, you should never delay fixing the problem.

Additionally, never attempt to fix the sensors by yourself. Of course, this restriction is only limited to amateurs. If you are a professional with enough technical knowledge, you are more than encouraged to fix the P2201 code.

By doing it yourself, you can save up a small amount of money that you will otherwise be required to pay the mechanic with.

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