DOT Inspections

Mobile Commercial Truck & Trailer Compliance

Welcome

Certified Mobile DOT Inspections for Trucks, Trailers, and Fleets

NoCo Diesel Services LLC provides certified mobile DOT inspections for commercial trucks, trailers, and fleets throughout Northern Colorado, Southern Wyoming, and Western Nebraska. Based in Johnstown, CO, we bring the inspection process directly to your lot, job site, or roadside location—saving you time, minimizing downtime, and helping you stay compliant.


We perform both periodic and pre-trip inspections in the field, including Federal Annual (Level 1) inspections required by the Department of Transportation. Whether you’re an owner-operator or managing a fleet of Class 8 trucks and trailers, we ensure your vehicles meet FMCSA safety standards and are ready for the road.

What Is a DOT Inspection?

DOT inspections are required by the Federal Motor Carrier Safety Administration (FMCSA) to ensure that commercial motor vehicles meet safety and operational standards. The most common is the annual inspection, which must be performed by a qualified inspector and documented to remain compliant with federal regulations.

These inspections typically include a full review of:

  • Brake system performance
  • Air lines and connections
  • Tires and wheels
  • Lights and electrical systems
  • Suspension and steering
  • Frame and chassis
  • Coupling devices
  • Exhaust systems
  • Windshield and wipers
  • Fuel system leaks
  • Emergency equipment


A passed DOT inspection means your truck or trailer is safe, compliant, and road-legal for the next 12 months.

24/7 DOT Compliance Support

DOT violations can result in costly downtime, fines, and missed loads. We help you stay ahead of compliance by offering mobile inspections during flexible hours—including after-hours and weekends when needed.

Need an inspection fast to avoid a penalty or missed trip? We can often provide same-day service, depending on your location.

We also assist in pre-inspection repairs. If your truck or trailer is flagged for an issue that could fail inspection—such as a brake leak, bad light, or wheel seal—we can often fix it on-site before completing the inspection, saving you from having to reschedule.

Who We Serve

Our mobile DOT inspection service supports:

  • Owner-operators
  • Small and large fleets
  • Regional and long-haul carriers
  • Reefer and dry van operators
  • Flatbed and equipment haulers
  • Construction and agricultural equipment transporters

We inspect Class 6–8 trucks, semi-trailers, flatbeds, tankers, utility trailers, and heavy-duty commercial equipment. Whether you manage one unit or 100, we help you stay ahead of inspections and avoid unexpected compliance issues.

Why Choose NoCo Diesel for DOT Inspections?

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Certified and Experienced

Our lead technician is DOT-certified with 15+ years of diesel repair experience, including 10+ years at International Truck and Kenworth dealerships.

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Truly Mobile

We come to your location with the tools, experience, and paperwork needed to complete your inspection on the spot.

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Repairs on the Same Visit

If we discover a compliance issue during the inspection, we can often repair it during the same visit—reducing delays and rescheduling.

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Flexible Scheduling

We offer inspections during regular business hours and outside of them, including weekends and evenings, to fit your schedule.

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Fleet-Friendly Services

We work with fleet managers to organize inspection schedules, reduce penalties, and track compliance deadlines.

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Pre-Trip and Preventive Inspections

In addition to annual DOT inspections, we offer pre-trip and preventive inspections to help you identify and fix problems before they lead to a failed inspection or on-road violation. This is especially helpful for fleets managing multiple drivers or preparing for safety audits.

Pre-trip inspections include:


  • Brake pad and drum condition
  • Air system leak checks
  • Tire tread and pressure
  • Light and signal function
  • ABS warning diagnostics
  • Fluid leaks and mechanical concerns

Schedule Your DOT Inspection Today

NoCo Diesel Services LLC makes it easy to stay compliant. Call now to schedule your mobile DOT inspection, request fleet scheduling, or ask about repairs needed to pass inspection.