cummins exhaust brake not working after delete


The Problem with Cummins Exhaust Brake Not Working After Delete

If you are a proud owner of a Cummins-powered vehicle, especially a truck, you know how important the exhaust brake is. This feature helps to slow down your vehicle by using the resistance of the engine to keep your brakes cool and save its lifespan. Unfortunately, some Cummins drivers have reported that their exhaust brake does not work after a delete. In this article, we will discuss why this issue occurs and what you can do to solve it.

What is a Delete?

Before we tackle the issue with the exhaust brake, let us first define what a “delete” means. A delete is a modification done to the engine control unit (ECU) of your Cummins engine. It involves removing the diesel particulate filter (DPF) and selective catalytic reduction (SCR), or any other emissions control systems, in your vehicle. The purpose of a delete is to improve the performance of your engine, increase fuel efficiency, and save repair costs.

The Issue with the Exhaust Brake

While a delete can bring benefits, it may also cause some problems, especially with the exhaust brake. The exhaust brake relies on the backpressure generated by the DPF and SCR systems to function effectively. Without these systems, the exhaust brake may not work as it should. Some Cummins drivers reported that their exhaust brake either does not engage or disengages too soon.

What to Do?

If you are experiencing this issue, and you want to keep your exhaust brake system, you may need to reverse the delete. It means reinstalling the DPF and SCR or installing an aftermarket exhaust brake system that works without these components. However, returning to stock may be difficult and costly, and it may also affect your vehicle’s warranty and legal standing.

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Another option is to adjust the settings of your exhaust brake system for better performance. Some Cummins owners have reported success in reprogramming the engine control module (ECM) to get the exhaust brake to work as it should. However, this option requires technical knowledge, and you may void your vehicle’s warranty and face legal consequences.

The Bottom Line

The Cummins exhaust brake issue after a delete is a common problem that Cummins owners face. It highlights the importance of understanding the consequences of a modification before performing it. While deleting the emissions control systems can bring benefits, it may also affect other components of your vehicle. If you want your exhaust brake system to work correctly, you may need to reverse the delete or reprogram your ECM. However, these options have their risks and costs, and you may need to consult a professional mechanic or engineer to get the best solution.