Heavy-Duty Diesel Mechanic Services in Raleigh, NC

About Our Heavy-Duty Diesel Mechanic Services

You want a repair service that does more than fix trucks. You need a team that understands the pressure of keeping a commercial fleet dependable, complaint, and profitable. At Triangle Fleet Services, we support the people who run the rigs. As a family-owned shop with deep roots in Raleigh, we’re proud to provide honest, high-quality diesel services for all makes and models of trucks.

Whether that’s light-duty pick-ups,  medium-duty box trucks, or a fleet of full Class 8 Macks, we’ve built our shop around keeping your operations running strong.

Why Raleigh Chooses Triangle Fleet Services

Keeping your trucks running is our passion. We’ve been doing it for a long time. We’ve earned the trust of local fleet managers by delivering consistently professional repairs, fast turnarounds, and clear communication.

Partnership-Ready for Fleet Management Providers

We’re proud to partner with major national fleet management companies to streamline billing, service coordination, and compliance. We work directly within these partner programs to make service simple:

• Amerit Fleet
• Donlen
• Element Fleet
• Enterprise
• Fleetio
• Fleetnet
• Holman
• Merchants Fleet
• Mike Albert Fleet Solutions
• Penske Fleet Management
• Union Leasing
• Wheels

Services Designed for Fleet Efficiency

We specialize in full-service support that keeps commercial fleets safe, legal, and productive. Our offerings include:

Federally Approved DOT Inspections

Compliance is a significant aspect of managing a fleet or operating a rig. We’re here to keep you compliant and road-legal with expert federal DOT inspections. Whether it’s trucks, buses, or trailers, we’ve got you covered with complete attention to detail, no guesswork. From brake stroke measurements to lighting systems, we ensure your Freightliner Cascadia, Kenworth T680, or International LT is fully compliant with FMCSA standards—no fluff—just action plans and documented results.

General Diesel Repairs

From electrical issues and engine trouble to suspension, brakes, and aftertreatment systems, we handle all aspects of diesel truck repair. Our technicians diagnose quickly and fix it right, so you don’t have to deal with the same issue twice. Whether it's engine diagnostics on your Cummins X15, servicing your mDRIVE transmission, or replacing NOx sensors, we know how to fix it right the first time.

Preventative Maintenance

We help fleets stay ahead of breakdowns with routine, mileage-based maintenance tailored to manufacturer specifications. We track service intervals, handle regular inspections, and provide the kind of routine care that keeps your vehicles ready for the road. We tailor your PM program to help you reduce costs and maximize your uptime, whether you’re running a fleet of Hino 268 or Kenworth T880.

Mobile Repair Services

Can’t make it to us? Let us come to you. Your trucks don’t always have time to go to us, so we come to you. We dispatch within a 25-mile radius of Raleigh to help you avoid steep towing bills and minimize your downtime. With our mobile services, you can count on everything from on-site diagnostics to DEF system and DPF regen repairs.

Bus Repair

We repair shuttle buses, transit vehicles, and fleet coaches with the same level of care we give to heavy-duty trucks. From air systems and HVAC to driveline and suspension, your bus fleet is in expert hands.

Trailer Repairs

Your trailer works just as hard as your truck. That’s why a well-maintained trailer is necessary to protect your cargo, your operators, and your business. We handle brakes, electrical systems, suspension, and structural repairs to keep your entire unit safe, aligned, and DOT compliant.

Fleet-Focused Service, Built on Trust

We know your fleet isn't just a set of trucks. It’s your business on wheels. Our job is to keep it reliable. That means fast turnarounds, honest communication, and service that’s aligned with your operational needs, just what’s in a playbook. Our team respects your schedule, budget, and compliance requirements because we've been there ourselves.

We don’t just want to be your repair shop; we want to be your fleet’s most trusted support team.

Where to get Commercial Fleet Repairs in Raleigh

Have trucks ready for service or planning your next maintenance cycle? Call Triangle Fleet Services at 919-659-5497. Whether it's a Freightliner, Hino, Kenworth, or Isuzu, we’re here to keep your trucks, trailers, and drivers ready for what’s next.