Common Cummins ISX DPF Delete Problems And How To Fix Them

You may be wondering about Cummins ISX DPF delete problems and what can be done with these.

First, let’s talk about DPF deletions. This process has been quite common in recent years. However, there have been issues linked with these, which is why it is very important to implement the right troubleshooting techniques to get these problems straightened out.

Find out what the common issues are with DPF delete to the Cummins ISX that you never knew.

cummins isx dpf delete problems

Cummins ISX DPF Delete Problems

The main purpose of a DPF delete is to bring every owner peace of mind. Because of the high cost linked with regenerating the DPF, as well as the DPF replacements to think about, there are some advantages to a DPF removal. The goal is to eliminate these concerns – both financial and logistic inconveniences with the DPF.

Hence, it is intended to make your vehicle more responsive, efficient, and reliable. Moreover, it ideally keeps your vehicle highly functional and without any issues.

Unfortunately, there are some instances when some people experience some inconveniences along the way. These include:

  • Car getting into Limp Mode
  • Resumption of the DPF warning light 
  • Flashing ignition coil light
  • MOT failure
  • Traction light on
  • Engine or turbo failure
  • Excessive smoke

For the most part, these issues are linked to the mobile agents and software companies used. This is why some perform a mobile DPF removal with the help of software with automated features that scan through vehicles’ ECU data. The goal is to delete data strings linked with the DPF file structure and within the set parameters. 

The only downside to this is that it is unable to delete the entire data strings since these are deep-coded and interlinked with file structures linked with these components:

  • Exhaust gas temperature
  • Air and fuel ratio
  • Fuel rail pressure

Thus, if your automated software was designed to delete all deep-coded and interlinked file structures, it is likely to interfere with sensors. As a result, data corruption may arise, among other errors. These can occur immediately once you have started the engine while others do not observe these errors instantly.

It is also worth noting that there are instances when the automated software fails to delete these areas of the file. However, it leaves part of your DPF file, which can equally bring issues as the ones mentioned above such as the resumption of the DPF light, MOT failure, and your vehicle going into Limp Mode.

DPF Delete – Is It Worth It?

Removing the DPF is designed to remove an issue that can be quite expensive. Moreover, by removing this obstruction in your exhaust system, this also produces extra back pressure, which allows your vehicle to run and perform better.

Hence, the process of removing your DPF does not only involve removing this component or cutting your DPF filter open and taking the insides out. This also involves the use of a vehicle ECU computer to maintain the section responsible for the deleted diesel particulate system. It also reprograms your car and allows it to function well as though it never had a DPF system in the first place.

As long as the DPF removal is done right and the section of your DPF program mapped out correctly from your vehicle computer, then you can rest assured knowing that your vehicle will be trouble-free even when you run it without your DPF system. 

Considering all of these benefits involved with a DPF delete, it can most certainly seem tempting to get it done. On the other hand, some problems tend to arise in a few cases. 

For instance, it is illegal in the UK and most of Europe to remove a DPF. Furthermore, once you have removed your particulate filter, this raises the possibility of vehicle emissions. The VFD band will also be altered, along with the road tax annual amount. As a result, the DVLA may prosecute the vehicle owner for some cases such as fraud. It is also possible to get charged for back tax payments for making these modifications.

Read More: All You Need To Know About Cummins ISX15 Oil Pressure Problems


Overall, it is important to know of your state’s or country’s rules regarding a DPF delete. Although there are benefits linked with it, there are some disadvantages worth taking note of. Weigh the pros and cons and decide if this practice is worth it despite some Cummins ISX DPF delete problems that may come along.

Leave a Comment