5 Reasons For P04DB Cummins Error Code And Their Solutions

What does the p04db Cummins error code mean? It means that the crankcase ventilation system is disconnected. This error code signifies a problem with the crankcase ventilation system.

However, the p04db error code can appear for several reasons. Eventually, these include a hole in the hose, programming issues, etc.

Well, to remove your difficulties, we have come up with 5 reasons and solutions for this error code in this article. Check below to know more.

P04db Cummins

A hole in the hoseReplace the hose
Programming issuesGet the computer of the car reprogrammed or reset
Dirty crankcase ventilation sensorClean with a liquid cleaner
Defective CCV filterReplace the defective filter
Defective CCV sensorReplace the defective ventilation sensor

Let’s check the below guide to know details about all the reasons and their solution to this error code.

A Hole In The Hose

Sometimes, people find that they have got the p04db error code even after replacing the CCV Filter on their 2015 Dodge Ram 2500 Cummins truck. If you also face this problem, you need to know that it happens when the hose from the CCV that links to the air intake has holes.

You will also notice that it had no clamp and was loose. After removing the hose, you will see that the connection point of the hose is melted.

Solution: To solve this prevalent p04db 2015 Cummins issue, you must replace the hose.

Programming Issues

You can find out that your 2013 Dodge Ram 3500 Cummins truck shows the p04db error code. Even after the CCV filter is new, you will get this code.

This problem happens for programming issues or a glitch in the program of the computer of your truck’s computer. With this 2013 Cummins p04db problem, you need to take your truck to the dealer. The dealer will reprogram or reset the truck’s computer to solve it.

Dirty Sensor

A dirty crankcase ventilation sensor can also cause the p04db error code problem. In this case, you will find a check engine light along with the p04db error code on your Cummins truck.

This problem occurs as the CCV sensor can become very dirty because of oil, smoke, etc. After being completely enclosed by dirt, the sensor begins malfunctioning, and then you will see the p04db code appearing.

Solution: In this case, you are required to clean the dirty CCV sensor with a liquid cleaner to solve this problem. If the problem is still not solved, you have to replace the sensor to get rid of the code.

Defective CCV Filter

Sometimes, when you are riding up on the mountain on a long trip with your 2012 Dodge Ram 2500 Cummins truck, the p04db error code can appear. This issue occurs for a defective crankcase ventilation filter.

Also Read: P0234 Cummins- We Have Found 5 Major Causes+ Quick Fixing Guide!

Generally, if you don’t replace your CCV filter even after 67,500 miles, it can cause a faulty crankcase filter.

Solution: If you get this error code p04db 2012 dodge Cummins or other model, you have to replace the defective crankcase ventilation filter.

Keep in mind that you are required to replace the crankcase ventilation filter every 67,500 miles, or else the p04db error code will appear again.

Faulty CCV Sensor

Even after disconnecting your truck’s battery, you can sometimes see the p04db error code on your Cummins truck. This issue happens to a defective sensor of the crankcase ventilation system. The heat from the engine generally causes the crankcase ventilation sensor to be bad.

Solution: In this case, replace the faulty crankcase ventilation sensor to solve this issue.

A Helpful Tutorial You May Need!

Frequently Asked Questions (FAQs)

What does P04DB mean?

The P04DB error code means that the crankcase ventilation system is disconnected. It arises when your engine assumes you have detached connections of the oil separator. This oil separator is recognized as the positive crankcase ventilation and the closed crankcase ventilation as well.

How often should you change the crankcase filter 6.7 Cummins?

Experts recommend that the Cummins 6.7L Turbo-Diesel engine’s crankcase filter should be replaced after every 67,500 miles for models older than the 2019 Dodge Ram Cummins truck. For models from the 2019 Dodge Ram Cummins truck to the 2022 Dodge Ram Cummins truck, they recommend that the Cummins 6.7L Turbo-Diesel engine’s crankcase filter should be replaced every 75,000 miles.

What does a crankcase ventilation filter do?

The crankcase ventilation filter removes oil particles, unwanted gas, and other debris from the crankcase of an internal combustion engine. This filter stops filth from getting into the crankcase, specifically at the time of the engine cooling method. As a result, it aids in keeping the crankcase clean. Eventually, it stops oil contamination, which can have far-reaching damaging effects on the engine.


The Dodge Ram Cummins truck gives a lot of diagnostic trouble codes that inform the internal state of the engine. The p04db error code is one of them, and it has its respective meaning. It is not a very hard task to fix the p04db error code unless you know all the reasons and solutions behind it.

We found it easy, and we have elaborately discussed all the reasons and easy solutions behind the p04db error code in this article. We are hopeful that you have found this article helpful and now can fix the p04db Cummins error code easily.

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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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