330-966-7467

After-Treatment System Repair & Service

DOC, DPF & SCR Service

Keep your emissions system running clean and compliant with expert after-treatment service from AAA Trailer Repair in Canton. We diagnose and repair DOC, DPF, and SCR systems to restore performance, fuel efficiency, and reliability.

Diagnostics for Modern Emission Systems

After-treatment systems are complex and essential for meeting today’s emissions standards. Our technicians use advanced diagnostic equipment to identify faults in the Diesel Oxidation Catalyst (DOC), Diesel Particulate Filter (DPF), and Selective Catalytic Reduction (SCR) systems — ensuring your truck runs efficiently and meets DOT compliance.

We provide complete inspection, cleaning, and repair of:

  • DOC (Diesel Oxidation Catalyst) — Reduces carbon monoxide and hydrocarbons.

  • DPF (Diesel Particulate Filter) — Traps and burns soot particles.

  • SCR (Selective Catalytic Reduction) — Converts nitrogen oxides into harmless nitrogen and water.

  • DEF system components (pumps, injectors, sensors)

  • Pressure sensors, temperature sensors, and wiring harnesses

  • Fault code diagnostics and system resets

  • Regeneration system checks

  • Engine derate issues

Signs Your After-Treatment System Needs Service

Addressing these problems early helps prevent downtime and ensures your truck stays compliant with emissions regulations.

  • Warning lights or fault codes for emissions

  • Frequent regenerations or failed regen cycles

  • Loss of power or poor fuel economy

  • Excessive exhaust smoke

  • DEF system or sensor malfunctions

AAA Tractor Repair Shop in North Canton, Ohio

Why Choose AAA Trailer Repair

Learn More

  • 32 Years of Experience servicing heavy-duty trucks and trailers

  • Veteran Owned & Operated

  • DOT Brake & AC Certified Technicians

  • Same-Day Service in Most Case

Hours:

​Daytime Roadside Service – No Milage

​MONDAY – FRIDAY: 8:00 AM – 6:00 PM

SATURDAY: 9:00 AM – 1PM

​NIGHT DROP AVAILABLE

Phone

Phone: (330) 966-7467

Fax: (330) 966-7468

Now Located On 5th St SW In Canton

Address

1220 5th St SW

Canton, OH 44707

(2/13/26 We moved down the road into a new location that fits our needs much better!  Come check out our new location on 5th St SW in Canton)