DPF burnout & cleaning — not a rinse.
A clogged DPF is behind more emissions fails, regen faults and derate events than almost anything else on a modern diesel. We bake, clean and flow-verify every filter we touch — and give you the numbers to prove it worked.
It's not the filter, it's the ash.
Active regens burn off soot, not ash. Ash from engine oil, fuel additives and DEF builds up in the filter channels over time. No amount of highway miles gets rid of it — and once it stacks up, backpressure climbs, regens run longer, fuel economy craters, and eventually the ECM throws a derate.
The symptoms are predictable: frequent active regens, forced parked regens, SPN 3251 / SPN 3609 codes, low power, elevated EGT, and a check-engine light that won't clear. The fix isn't a new filter — it's a proper clean.
Replacement filters run $2,500–$4,500 on Class 8 rigs. A full clean runs a fraction of that and restores the unit to like-new backpressure for years. Most filters take 3–5 clean cycles before they truly need replacement.
Four steps, every time.
- Initial flow testWe pull the filter, weigh it and run a baseline flow test. You get a before number, not a guess.
- Thermal bake-outOven cycle at controlled temperature to convert remaining soot and break down ash binders. This is the "burnout" — and it's the step cheap shops skip.
- Pneumatic cleaningReverse-flow pulsed air cleans every channel individually. We rotate and re-clean until the substrate is visibly clear end to end.
- Flow verification & weighFinal flow test and weigh-in. You get a printed report with before / after numbers. If it didn't hit spec, it doesn't leave.
- Reinstall & regen resetGaskets, clamps and sensors reinstalled to torque spec. Soot and ash counters reset, forced regen performed, codes cleared.
- DOC service includedWe clean the diesel oxidation catalyst at the same time. A clogged DOC causes the same symptoms — might as well do it once.
Fast facts.
| Works on | Cummins · Detroit · Paccar · International · Volvo · Mack · Hino · Isuzu |
|---|---|
| Typical interval | Every 200,000–300,000 miles (or when backpressure / regen frequency climbs) |
| Turnaround | Most filters in & out same day; 24 hours on heavy ash loads |
| Result you get | Before / after flow numbers, weight report, regen reset confirmation, parts list |
| When to replace instead | Cracked substrate, melted cells, catalyst washcoat damage — we'll show you before we condemn one |
| Fleet program | Scheduled rotating cleans so no truck is ever the one with the bad filter |
What drivers and dispatchers ask.
My truck just keeps regenning. Is that a DPF issue?
Almost always yes — if the truck needs an active regen every few hundred miles, the substrate is loaded. We verify with a flow test and go from there. Sometimes it's a DEF or EGR issue instead; the diagnostic tells us which.
Do I need to replace the filter or can it be cleaned?
Most filters can be cleaned 3–5 times in their service life. We only condemn a filter if the substrate is cracked, melted, or the washcoat is damaged. You'll see the evidence before we recommend replacement.
How is this different from forced regen?
Forced regen burns soot. It does nothing for ash — and ash is what actually clogs the filter long-term. Our bake-and-clean process removes both.
Will this fix my emissions fail?
If the fault is DPF-related, yes — a proper clean and sensor check resolves most Clean Truck Check emissions fails. We'll re-run the CTC test on the same visit.
Do you clean DOCs and SCRs too?
DOCs, yes — included with DPF service. SCR cleaning is a different process and we handle those too; ask us when you call.