Why Does My Truck Regen So Often?

If you drive a truck, you might have noticed that it regenerates its brakes often. This blog post will explain what regeneration is and why it occurs and provide tips on extending the life of your truck’s brake system. If you have any questions or concerns about your truck’s brake system, don’t hesitate to contact a professional.


Understanding Regeneration

Regeneration is the process that occurs when the truck’s computer system automatically initiates a cycle to protect the brake system from heat damage. During regeneration, the engine runs at a higher RPM than usual, spinning the truck’s wheels faster to cool down the brakes. The regeneration process can last from 30 seconds to a few minutes and may happen several times during a long drive.

Causes of Frequent Regen

DPF regeneration can occur more frequently due to excessive idling, short trips, and other city driving habits. If an EGR valve, turbocharger, or injector is not working correctly, it can also cause your DPF to regenerate more frequently, leading to problems with your vehicle. If your DPF regenerates more regularly than usual, take your truck to a mechanic to check it out.

Frequency of Regen

The regeneration frequency depends on driving habits, duty cycle, and the amount of soot collected. It can occur as often as once a day or even more frequently if you do a lot of stop-and-go driving. You may notice reduced power and fuel economy during active regeneration, but this should return to normal once regeneration is complete.

Regen While Driving

Passive regeneration occurs during routine driving and as needed, while active regeneration occurs during highway driving when the truck is under a greater load. Passive regeneration burns off small amounts of hydrocarbon in the filter, while active regeneration involves larger amounts of hydrocarbon injected into the exhaust stream to burn off particulate matter and clean the filter.

Turning off the Truck during Regen

Regeneration can take a significant amount of time, especially during stop-and-go driving. If you turn off your truck during regeneration, it will pick up where it left off when you turn it back on. However, it’s best to perform regeneration on the highway where you can maintain a consistent speed for optimal results.

Triggering DPF Regeneration

The Diesel Particulate Filter (DPF) is an emission control device that traps soot particles in exhaust gas. Over time, the DPF will become clogged with soot, reducing its effectiveness. Regeneration involves burning off the accumulated soot and can be either passive or active. Passive regeneration occurs when the engine is operated at high temperatures, while active regeneration occurs when the engine is used at even higher temperatures, typically achieved by injecting extra fuel. As a result, active regeneration is usually more effective than passive regeneration but can also place additional strain on the engine.


The diesel particulate filter (DPF) is crucial in reducing soot emissions from a truck’s engine. However, the DPF may become clogged with soot over time and require regeneration. Regeneration can take the form of passive or active methods. Passive regeneration occurs during high-temperature engine operation, such as highway driving, while active regeneration requires injecting additional fuel into the combustion chamber to achieve even higher temperatures. While active regeneration is typically more effective, it may also strain the engine.

About the author, Laurence Perkins

Laurence Perkins is the passionate car enthusiast behind the blog My Auto Machine. With over a decade of experience in the automotive industry, Perkins has knowledge and experience with a wide range of car makes and models. His particular interests lie in performance and modification, and his blog covers these topics in-depth. In addition to his own blog, Perkins is a respected voice in the automotive community and writes for various automotive publications. His insights and opinions on cars are highly sought-after.