Semi-Truck Repair

Mobile Service for Class 8 Trucks

Welcome

Expert On-Site Repair for Semis, 18-Wheelers, and Commercial Diesel Trucks

NoCo Diesel Services LLC specializes in semi-truck repair throughout Northern Colorado and surrounding regions. Based in Johnstown, CO, we offer fully mobile, 24/7 repair service for Class 8 trucks, including emergency breakdown response, electrical diagnostics, air brake systems, and aftertreatment troubleshooting.

With over 15 years of diesel experience and a background in dealership service for International and Kenworth, our lead technician delivers skilled repairs that keep your truck compliant, safe, and back on the road as fast as possible.

Full-Service Mobile Semi-Truck Repair

We provide on-site diagnostics and repair for a wide range of mechanical and electronic issues affecting semi-trucks and heavy-duty tractors. Our goal is to restore functionality quickly, minimize downtime, and reduce your operating costs without sacrificing quality.

Common Semi-Truck Repairs We Handle:

  • Check engine light diagnostics and code resets
  • No-start or rough idle issues
  • Engine power loss or derate conditions
  • DPF and SCR aftertreatment faults and regens
  • Air brake system failures and leak repairs
  • Wheel seal leaks and hub repairs
  • Electrical shorts, fuse problems, or lighting faults
  • Battery system issues and charging diagnostics
  • Suspension and shock replacement
  • ECM and sensor troubleshooting
  • ABS and traction control system diagnostics


Our service trucks are stocked with diagnostic tools, OEM scan software, air tools, repair parts, and fluids to perform most repairs in the field. You don’t need a tow—just give us a call.

Mobile Service for Owner-Operators and Fleets

We support both independent operators and commercial fleets. Whether you’re managing a single semi or a group of tractors, our mobile repair service offers flexibility, speed, and reduced disruption to your schedule.

Our service model eliminates the need to coordinate towing, shop drop-offs, or long wait times. We work directly on your site and schedule preventive maintenance around your operational demands.

Need help tracking PMs or coordinating DOT inspections for multiple trucks? Ask about our fleet maintenance options.

24/7 Mobile Semi Repair and Emergency Response

We offer 24-hour mobile repair for semis and heavy-duty diesel trucks. Whether your truck is broken down on I-25 or parked at a distribution lot, we respond quickly and arrive prepared.

Common roadside calls include:

  • Semi won’t start
  • Engine derate or limp mode
  • Aftertreatment or regen failure
  • Brake chamber or line leaks
  • Electrical system failure
  • Dead batteries or no crank
  • Low power or fuel system issues

The NoCo Diesel Advantage

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15+ years of diesel-specific experience

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Fast, accurate mobile diagnostics

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24/7 emergency repair response

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Full-service repairs for semis and heavy trucks

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Transparent pricing and clear communication

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Dedicated support for owner-operators and fleets

Get Your Truck Back on the Road

If your semi-truck is experiencing mechanical issues or won’t start, call NoCo Diesel Services LLC. We’re available now to help you recover quickly and safely.

We’re here to support drivers and businesses who rely on their trucks every day. Contact us now for mobile semi-truck repair