What is an AHI Dosing Module on Volvo / Mack engines? (3-minute read) Essential Takeaways The AHI module’s purpose is to regulate and control the amount of fuel that goes to the 7th injector during the DPF regeneration process. The AHI module goes through various self-checks during the operation of the engine. If the system detects an issue, it will automatically cause an active fault code related to the AHI module or 7th injector.  If you have a failed AHI module, passive, active, and forced DPF regens will all fail. You cannot bypass the AHI module to do a forced regen. The truck requires all of the emission components to be in proper working order for the truck to start a forced...

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. When you start your truck back up you notice a red stop engine light and your DPF light is flashing. The truck carrying your precious load is now in a critical state of emergency. You pray that it’s not in the dreaded 5 MPH derate…

Paccar Forced DPF Regen on Paccar MX Engine   We are excited to present to you a new and exciting feature on the DTC + AFT Reset Tools for Paccar MX engines. This new feature will give you the ability to perform a forced DPF regen anytime, anywhere. So, if you are driving in the middle of the night and you need to do a DPF regen, you can. While anyone can perform the forced DPF regen with the DTC + AFT Reset Tool because of the simplicity of use, you do need to understand two important concepts. You need to know what a forced DPF regen is and why you need to perform one. What is a forced DPF regen and why...

What is Forced Regeneration? Regeneration, or regen, of the DPF filter is the process that burns the soot accumulation that is inside the DPF filter. Educating yourself on what a forced regeneration is and how it works will help you understand your aftertreatment system better. Forced regeneration is performed when a diagnostic scan tool starts the regeneration process. The forced regeneration overrides the soot accumulation or soot levels that are calculated in the ECM. The DPF soot load could be too high for a passive and active regeneration to occur causing the condition where it is required to perform a forced regeneration. A forced regeneration is the highest level of regeneration processes and you will need a special diagnostic tool...

The fault codes related to P1495/P1496 mean that the engine protection has been enabled causing the EGR to be disabled and the system to go into preventative safety measures. As a result, passive / active DPF regeneration is disabled as well. When a problem arises, you have 10 hours to fix the problem or else it goes into an EGR derate.  This EGR derate on a Paccar limits your engine power up to 25-40%. The loss in power will prompt you to seek service at a repair shop or dealer.  What causes P1496 to become active?  This fault code is an indication that there is a problem with another fault code that triggers a derate. So, this fault code alone is not enough to fix it. There is actually more to the story...