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Licensed & Insured · Maryland · 24/7 dispatch · (240) 780-8691

DPF Derate Repair in Maryland — Mobile Diesel Truck Aftertreatment Service

Derated truck, DPF or DEF fault, failed regen, or a diesel that will not start? Priority Towing and Recovery sends a mobile diesel mechanic to your commercial truck — roadside or at your yard — from Randallstown, Columbia, Baltimore, and Westminster. We repair and restore proper emissions systems. Commercial trucks only; no delete tuning.

Call (240) 780-8691 Request Fleet Quote

DPF, DEF & derate problems we diagnose

Commercial diesel trucks only — tractors, reefers, box trucks, and medium-duty equipment. We do not offer general auto repair. If your truck is showing any of these, call dispatch with the codes you have.

  • Engine derate / limited power — the truck is held in a reduced-power or speed-limited state and cannot pull normally.
  • DPF warnings & regens that will not finish — diesel particulate filter lights, forced regeneration, and finding out why the filter keeps loading up.
  • DEF & SCR faults — diesel exhaust fluid and selective catalytic reduction fault codes that trigger a derate or a countdown to one.
  • No-start or limp mode — trucks that will not start or drop into limp mode with aftertreatment or related fault codes active.
  • Check-engine & aftertreatment codes — reading and interpreting active and stored codes so the repair targets the actual cause.
  • Sensors, wiring & electrical — failed sensors, damaged wiring, and charging or battery problems that set aftertreatment faults.

Truck derated or throwing a DPF fault?

Tell dispatch the make and model, location, and the fault codes you have. One number for the mobile diesel mechanic and heavy recovery.

Call (240) 780-8691 Mobile diesel mechanic

We repair and restore your emissions system — no delete tuning

Priority Towing and Recovery repairs and restores proper emissions systems on commercial diesel trucks. We find the cause of the fault, fix it, and perform forced regenerations and derate clears when the unit can be made safe and legal on site. We do not perform emissions deletes or delete tuning, and we will not remove, bypass, or disable DPF, DEF, or SCR components.

That keeps your truck compliant and keeps you out of the bigger problems a deleted system creates for a fleet.

How a mobile DPF derate repair works

  1. Call dispatch

    Call (240) 780-8691 any hour. Share your location, the truck, and the symptoms or codes.

  2. Mobile diesel mechanic rolls to you

    We dispatch a mobile diesel mechanic from the closest of our four Maryland locations to the highway shoulder, your yard, or the job site.

  3. Diagnose, repair, restore

    We diagnose the aftertreatment fault, repair what failed, and run a forced regen or derate clear when the unit can be made safe and legal on site.

Some aftertreatment failures cannot be finished roadside. When that happens the same dispatcher can bring the unit to our Randallstown shop (shop diesel is Randallstown only) or send our heavy-duty towing and recovery equipment on the same company ticket.

Diesel technician with diagnostic tablet at the truck cab Two Priority diesel technicians diagnosing a commercial truck roadside

DPF derate repair across Maryland

Mobile service rolls from every Priority location, serving Randallstown, Columbia, Baltimore, Westminster, and the surrounding Maryland area — see the full service area or the Columbia location. Shop diesel repair is available only at the Randallstown location.

More on our roadside work: mobile diesel mechanic · truck road service · diesel repair · contact / fleet quote

DPF derate repair FAQ

Do you repair DPF derates on site?

Yes. Our mobile diesel mechanic diagnoses DPF, DEF, and SCR faults where the truck sits and performs forced regens and derate clears when the unit can be made safe and legal. Call (240) 780-8691, 24/7.

Will you delete my DPF or DEF system?

No. We do not do emissions deletes or delete tuning. We repair and restore proper emissions systems on commercial diesel trucks.

My truck is derated and I am on the highway. What should I do?

Get to a safe spot and call (240) 780-8691. Give dispatch your location, the truck, and any fault codes. We send a mobile diesel mechanic from the closest of our four Maryland locations.

Can you come to my yard instead of the roadside?

Yes. We work at the roadside, at your yard, or at a job site.

What if the DPF problem cannot be fixed on site?

The same dispatcher can bring the truck to our Randallstown shop or send our heavy wreckers or Landoll/RGN equipment. Shop diesel repair is Randallstown only, at 9325 Liberty Rd.

Do you work on cars or pickups?

No. We service commercial diesel trucks only — not passenger-car auto repair.

Are you open overnight and on weekends?

Dispatch is 24/7. Call (240) 780-8691 any hour. Priority Towing and Recovery is licensed and insured.

Call for DPF derate repair · Maryland

Priority Towing and Recovery — one call for the diesel mechanic and the iron. Fleet accounts: request a quote online; a derated or down truck should call dispatch.

Call (240) 780-8691 Request Fleet Quote Heavy duty towing & recovery