How to Fix the P2002 Code on Cummins (Step-by-Step Guide)

The Cummins engine is one of the most commonly used vehicle engines in the world. However, it is not without its own fair share of problems. You can use DTCs to identify these problems and then take measures to resolve them.

The code p2002 on Cummins is stored when the engine’s diesel particulate filter efficiency falls below the standard value. This can be caused by various external factors. The most common of these are dried diesel clogging the valves or faulty pressure sensors. 

Are you interested in knowing how to resolve this problem? Well, then scroll down and keep reading. You will get all of your questions answered. Keep reading!

How to Fix the P2002 Code on Cummins

What Does Code P2002 Mean On Cummins?

The P2002 Code is a Diagnostic Trouble Code (DTC) triggered in your engine due to irregular pressure in the exhaust valves. 

This pressure is caused by dried diesel clogging the DPF at the back of the exhaust system. In addition, even if there are no blockages in the regular pressure flow, broken sensors can also cause this problem.  

When this problem occurs, your car can fall into limp mode. This results in decreased running performance due to a lack of fuel economy. Additionally, the total efficiency of the engine will also be reduced. 

Here is the breakdown of the code to increase your understanding. 

  • P = Powertrain, the system of components that propels your car forward.
  • 2= It refers to a generic manufacturing code
  • 0= It represents the systems associated with the exhaust.
  • 02= Specific Fault Index (In this case, it refers to when particulate filter efficiency below threshold has been detected)

How Serious Is Code P2002 On Cummins?

This DTC code is referred to as a “soft code.” As such, it is not a serious code out there. Aside from decreasing the overall performance and efficiency of your car, there are not many other effects in existence. 

However, that doesn’t give you any excuse for making delays in fixing the car. While we won’t ask you to resolve the issue as soon as possible, you are advised to fix it early. 

Not only is driving in low-performance mode very annoying, but it is also unhealthy for your car’s engine in the long run. Besides, the constant flashing of the code can also prove to be highly frustrating. 

This is why we advise you to resolve the P2002 code in your Cummins engine at the first opportunity you get. 

What Causes The P2002 Code On Cummins?

This could explain several underlying reasons why your Cummins engine might be affected by the P2002 code. We have compiled and listed some of the more common ones below. 

  • Air leaking upstream from the DPF
  • The filter is too dirty
  • Usage of high-sulfur diesel
  • Clogged or damaged valves
  • Faulty or damaged air pressure sensors
  • Worn-out or overclocking ECM circuits

How To Fix The P2002 Code On Cummins?

In this section, we will be covering the step-by-step procedure for fixing the P2002 Code Issue. Do note that this procedure is more of an in-general than a technical one. 

Step 1: Run Scans

Use an OBD-II scanner to scan the internals of the exhaust system. Put the scanner in its specific port to get the records and find out if there are any deviations in those values. 

Step 2: Run Visual Diagnosis

Use your own eyes to look around the various wires and components inside the exhaust system. Check to see whether there are any torn-out wires. Look for signs of wear and tear in connectors, modules, etc. 

Step 3: Clean The filter

Open the exhaust system to clean the filter if it appears to be dirty. Start by unfastening the compartment housing the filter and getting it out. Wipe the filter using a microfiber cloth to get rid of dust particles. 

You can also use a car cleaning agent to clean the filter. You can use a garden hose to give it a final wash. Shake to remove excess water. Use a vacuum to dry it up before placing it back into place. 

Step 4: Patch Up The Connectors And Sensors

Once you have cleaned to filter, patch up any of the connectors and sensors that appear to be damaged. In case, you are unable to salvage them, replace them with new working ones. 

Other Symptoms Of Getting Code P2002 On Cummins

There are a lot of symptoms that can be associated with causing the code P2002 to be triggered on your Cummins engine. Below, we have listed some of the more common ones that you may experience. 

  • ‘Check light’ signal is triggered
  • Sluggish engine performance
  • Black smoke from the back of your exhaust valves
  • Engine oil dilutes very quickly
  • Partial of full berate

How Much Does It Cost To Fix Code P2002 On Cummins?

What exactly you will be paying to fix the P2002 code will depend on whether you will be doing it on your own or not. 

If you are going to hire a mechanic, expect to pay around 50 to 150 USD. This is the labor cost of the mechanic and will typically depend on the shop where you are hiring the mechanic from. 

When you are going to do it on your own, there are no labor costs involved. Instead, all you will be paying for are the extra components that you might potentially replace. This varies between 10 to 20 USD. 

Can You Drive Your Cummins With The P2002 Code?

Yes, you can drive your car with the P2002 code still active. However, we wouldn’t recommend it to you in the long run. Not only is it damaging for your car, but even the user performance it will show is mediocre at best. 

As such, we advise you to resolve the P2002 code as soon as possible. Otherwise, it will be too late to fix it, and you will be forced to spend a lot of money on the entire exhaust. 


Now that we are at the end of this article, you should have received all solutions to this automobile problem. Hopefully, we have been able to help you resolve the p2002 code. 

While you can fix it on your own, we wouldn’t recommend an amateur to go for it. Instead hiring a mechanic for the job will be a much better option in the long run. 

While they do cost money, professional mechanics will be able to patch up all problems without much issue in the least amount of time.

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