What is DPF cleaning and why does it matter?
A diesel particulate filter traps the soot in your engine's exhaust. Over time that soot turns to ash, airflow drops, and the truck starts forcing regens, throwing derate codes, or going down entirely — that's lost fuel, lost hours, and a truck that isn't earning. DPF cleaning strips out the built-up ash and soot and brings airflow back, so the truck runs at full power again. A filter that looks fine can still be flow-restricted, which is why testing matters as much as cleaning. The DPF is federally required emissions equipment you can't legally remove (U.S. EPA), but that's not why fleets clean it. They clean it to keep the truck out of derate and off the shoulder.
What are the different types of DPF cleaning?
There are three common methods, and each targets buildup a different way. Ash packs into a filter tightly enough that no single method is always best, so many shops combine them and confirm the result with a flow test. Thermal (bake) cleaning The filter is heated in an oven or kiln to burn off soot and hydrocarbons that ordinary regeneration leaves behind, converting them to loose ash. Thermal cleaning is usually paired with an air step to then clear that ash out. Pneumatic (air) cleaning Pulses of compressed air are forced back through the filter's channels to dislodge and remove accumulated ash. It's fast and dry, and it's often the first pass before or after a bake cycle. Aqueous (liquid) cleaning The filter is flushed with water or a cleaning solution to break loose ash and contaminants that air alone can't reach, then fully dried before testing. This method can recover deeply loaded or oil-fouled filters.
What does the DPF cleaning process involve.
Our service runs in four steps, and each one has a purpose. Skipping the test step is how shops return filters that still fail in the field.
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InspectionEach filter is checked for cracks, melting, and excessive wear before cleaning. A damaged substrate can't be saved, and catching it here means you don't pay to clean a filter that needs replacing.
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CleaningWe remove accumulated soot, ash, and contaminants using commercial DPF cleaning equipment.
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Flow testingAfter cleaning, the filter is flow-tested and the result is compared to OEM airflow specifications. You get a number, not a "looks good."
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ReturnCleaned, tested filters are returned ready to install.
What are the benefits of regular DPF cleaning?
Staying ahead of ash buildup is cheaper than reacting to a derate on the shoulder of the highway. Regular cleaning keeps exhaust backpressure down, which protects fuel economy and reduces the forced regens that eat fuel and driver time.
- Full engine power restored — no more derate limping
- Better fuel economy from lower exhaust backpressure
- Fewer forced regens and unplanned breakdowns
- Extended DPF and engine life, and a filter saved from a costly replacement
- A functioning, road-legal emissions system
DPF Services for every fleet
Whether you run a single truck or a nationwide fleet, we help keep your vehicles running and your business moving. We clean DPFs for all major brands and types of diesel vehicles, including heavy-duty and medium-duty trucks, buses, and commercial equipment. Need documentation, service menus, or scheduling? We provide online forms, brochures, and pickup and shipment of your filters.
FAQ
Do you clean all makes and models?
Yes. We service DPFs for all major diesel makes across heavy-duty and medium-duty trucks, buses, and commercial equipment.
What’s the difference between cleaning and replacing a DPF?
Cleaning removes ash and soot to restore airflow on a filter that’s still structurally sound. Replacement is only needed when the substrate is cracked or melted. Because a new filter costs substantially more than a cleaning, restoring a sound filter is the economical choice.
Which DPF cleaning method is best?
It depends on the filter’s condition. Thermal (bake), pneumatic (air), and aqueous (liquid) cleaning each remove buildup differently, and heavily loaded or oil-fouled filters often need more than one. A post-clean flow test against OEM specification is what confirms the method worked, whichever was used.
How do I know my DPF needs cleaning?
Frequent forced regens, reduced fuel economy, loss of power, or a DPF or derate warning light are common signs. A flow test confirms whether airflow has dropped below OEM specification.
Can DPF cleaning improve fuel economy?
A clogged filter raises exhaust backpressure and triggers more frequent regens, both of which cost fuel. Restoring airflow to spec removes that penalty, which is a core reason fleets clean filters on a regular basis.
Can you pick up and ship filters?
Yes. Contact your nearest Allegiance Truck Centers location to arrange pickup and shipment of your filters.