Emissions systems
DPF & Aftertreatment Service
A truck that regens constantly is not telling you the filter is full. It is telling you something upstream is putting soot into it faster than it should.
The work
Aftertreatment work we do on site
Aftertreatment is where the most expensive misdiagnoses in the industry happen, because the symptom and the cause are usually in different places. A filter that loads up every few hours gets cleaned or replaced, the fleet pays for it, and four weeks later the truck is doing it again — because the real fault was an injector dribbling fuel, a leaking EGR cooler, a turbo not making boost, or a differential pressure sensor reading a blockage that was never there.
We treat a regen complaint as a diagnostic job first and a filter job second. That order is the difference between fixing it once and paying for the same filter twice a year.
- Forced and stationary regeneration
- Persistent and frequent-regen fault diagnosis
- DPF differential-pressure sensor and line faults
- DEF system, dosing and quality-sensor faults
- SCR and NOx sensor diagnosis
- EGR valve and cooler faults driving soot loading
- Emissions-related derate diagnosis and clearing
- Wiring and connector repair behind recurring codes
When to call
Signs the problem is upstream, not the filter
- Regens far more frequent than the duty cycle explains
- A filter that was cleaned or replaced recently and is loading again
- DEF consumption noticeably up or down
- Derate returning shortly after a code clear
- Visible smoke alongside emissions codes
Coverage
Engines and makes
Cummins and Detroit Diesel, including Cummins LNG and CNG alternative-fuel systems, across Freightliner, International, Isuzu, Hino, Autocar.
Recurring regens are usually a symptom of something upstream rather than a filter that simply needs cleaning. We find the upstream cause first — and if the filter genuinely is the problem, you will know that on evidence rather than assumption.
Where we work
DPF & Aftertreatment across Greater Los Angeles
We bring this work to your yard across the districts we cover from our Glassell Park base:
Related
Other services
Diesel Engine Repair
Cummins and Detroit Diesel engine work carried out at your yard — diagnosed with OEM software before a single part comes off, by technicians who spent seventeen years doing it inside Freightliner and International dealerships.
Read moreElectronic Diagnostics
Reading a code off a generic scanner tells you a circuit is unhappy. OEM-level diagnostics tell you which part is failing and why — and that difference is usually the whole repair bill.
Read moreCNG & LNG Service
Very few shops in Los Angeles will touch a natural-gas heavy-duty engine. If you run CNG or LNG and have been told to take it to a dealer, talk to us first.
Read moreClean Truck Check
A Clean Truck Check failure does not just cost a retest. Compliance is tied to DMV registration — an unresolved failure can stop you registering the unit at all.
Read moreBrake, Air & Suspension
An out-of-service brake defect takes a unit off the board until it is corrected. We carry the components and the tooling to correct it in your yard rather than in a shop queue.
Read moreDrivetrain & Transmission
Wheel-end and axle work is the job most people assume has to go into a shop. With the heavy jacks and tooling on board, most of it does not.
Read moreNeed dpf & aftertreatment at your yard?
Call dispatch with the yard address, unit number, make and engine, and any fault codes on the dash.
Straight answers