However, when it’s a specific 5 MPH derate then you can be certain that the problem is related to the emissions, aka the aftertreatment system. A derate can be caused by various sensors or systems. A derate is designed to protect you from causing engine or DPF damage. What is a DEF derate or an aftertreatment derate?Ī derate means that the program inside the engine computer limits either the power or vehicle speed. It’s something we hear all the time because this is what happens when the truck detects a fluke in the system or from a malfunctioning component. Unfortunately, we hear this story on a daily basis from our customers. So, you crawl to the shoulder only to find that now you can’t even proceed driving.
So, you hold the clutch down and put it into 2 nd gear to try to creep past that 5 MPH mark realizing after a few minutes that your truck will not budge. You pray that it’s not in the dreaded 5 MPH derate… The truck carrying your precious load is now in a critical state of emergency. When you start your truck back up you notice a red stop engine light and your DPF light is flashing. You just crossed the bridge into Canada and your 2013 Peterbilt 389 with a Cummins ISX CM2250 truck was turned off at the border checkpoint.
You’ve heard the same story over and over, maybe even experienced it yourself.
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