What types of heavy duty trucks do you repair?

We service all major heavy trucks but specialize in Volvo and Freightliner models. We maintain quality used parts inventory for these brands, ensuring faster and more affordable repairs.

Can you help with MTO “Out of Service” orders?

Yes. As a certified MTO inspection station, we can diagnose, repair, and document fixes to help clear “Out of Service” orders quickly and get you back on the road.

Do you handle DPF/DEF troubleshooting and repairs?

Absolutely. We are specialists in DPF/DEF diagnostics and repairs—often saving clients thousands by preventing costly roadside shutdowns and compliance issues.

What if I need a custom part or the dealer can’t supply it?

Our team can fabricate critical components, such as transmission hoses, on-site. This minimizes downtime when OEM parts are unavailable or on backorder.

Do you offer emergency roadside heavy repair?

Yes. Our 24/7 emergency roadside service covers South Glengarry, Cornwall, and the Hwy 401 corridor for urgent, heavy duty mechanical failures and breakdowns.

Are your repairs covered by warranty?

We stand behind our repairs and use quality parts. Please call for current warranty details on specific repairs, as coverage varies by service type and part.

Do you service oil and gas transport or straight trucks?

No. We do not work on oil and gas transport equipment or straight trucks. Our focus is strictly on heavy-duty highway tractors and trailers.

Heavy Duty Mechanical Repairs

Unexpected breakdowns, DPF derates, or MTO “Out of Service” orders can threaten your revenue and reputation. At RJ Truck & Trailer Repair Inc., heavy duty mechanical repairs aren’t just a service—they’re a lifeline for owner-operators and fleets moving freight across the Greater Toronto–Montreal corridor. Our shop is built on real-world experience: head mechanic, Jay, spent 30 years behind the wheel before mastering heavy-duty mechanics. That means every repair—engine, transmission, driveline, or emissions system—is performed with a driver’s urgency and a provincial inspector’s precision. Whether you’re facing a roadside breakdown near Cornwall, need a custom-fabricated hose the dealer can’t supply, or require certified MTO and emissions inspections to stay legal, we deliver fast, honest, and affordable solutions. We specialize in Volvo and Freightliner trucks, maintain on-hand used parts, and now offer full tire services, trailer repairs, and commercial truck washes to keep your rig compliant and presentable.

Downtime isn’t just an inconvenience—it’s lost revenue. That’s why we treat every heavy duty mechanical repair as a race against the clock. Our shop is MTO and Emissions certified, giving you the compliance documentation needed to get back on Ontario’s roads fast. We handle high-stakes repairs—from DPF/DEF troubleshooting to transmission overhauls—with the same integrity that kept our own fleet running for decades. When a part is on backorder, our team can fabricate hoses and components in-house, reducing wait times that other shops can’t. We’re a family-run business, not a faceless chain: that means honest work, fair pricing, and a driver-first attitude. Our reputation for reliability, technical depth, and empathy for the driver’s situation is why Cornwall-area truckers and fleet managers trust us to protect their uptime and livelihood.

Our heavy duty mechanical repair offering covers every critical system on your truck or trailer. We provide advanced engine diagnostics and repairs, transmission rebuilds, driveline and A/C repairs, and specialized DPF/DEF troubleshooting—essential for modern emissions compliance. If you’re stuck with a mechanical failure on Hwy 401, our 24/7 emergency roadside support covers South Glengarry, Cornwall, and the regional corridor. We’re also your hub for certified MTO inspections, Ontario plate emissions testing, and compliance paperwork for hassle-free cross-province operation. Fifth-wheel repairs, trailer service, tire changes, and oil changes round out our full-spectrum maintenance. We focus on equipment longevity, not band-aid fixes—so every repair is an investment in your truck’s next 500,000 miles. Specializing in Volvo and Freightliner, we maintain a quality inventory of used OEM parts for these makes, keeping costs down and trucks on the road.

Every minute your truck is down costs money. Our team understands the urgency of heavy duty mechanical repairs because we’ve lived it. From clearing “Out of Service” MTO orders to solving complex starter issues, coupling problems, and custom fabrication needs, we move fast—without compromising on quality. Our shop is designed for fast turnarounds, but we never cut corners on compliance or safety. That’s why owner-operators, transport companies, and fleet managers across South Glengarry and Cornwall choose us for honest diagnostics, transparent pricing, and repairs that last. We believe in building long-term relationships; that’s why minor compliance issues—like a bent fifth wheel plate—are often fixed on the spot, at no charge, to get you moving. Trust a team that sees your truck as your livelihood, not just another invoice.

What types of heavy duty trucks do you repair?
We service all major heavy trucks but specialize in Volvo and Freightliner models. We maintain quality used parts inventory for these brands, ensuring faster and more affordable repairs.
Can you help with MTO “Out of Service” orders?
Yes. As a certified MTO inspection station, we can diagnose, repair, and document fixes to help clear “Out of Service” orders quickly and get you back on the road.
Do you handle DPF/DEF troubleshooting and repairs?
Absolutely. We are specialists in DPF/DEF diagnostics and repairs—often saving clients thousands by preventing costly roadside shutdowns and compliance issues.
What if I need a custom part or the dealer can’t supply it?
Our team can fabricate critical components, such as transmission hoses, on-site. This minimizes downtime when OEM parts are unavailable or on backorder.
Do you offer emergency roadside heavy repair?
Yes. Our 24/7 emergency roadside service covers South Glengarry, Cornwall, and the Hwy 401 corridor for urgent, heavy duty mechanical failures and breakdowns.
Are your repairs covered by warranty?
We stand behind our repairs and use quality parts. Please call for current warranty details on specific repairs, as coverage varies by service type and part.
Do you service oil and gas transport or straight trucks?
No. We do not work on oil and gas transport equipment or straight trucks. Our focus is strictly on heavy-duty highway tractors and trailers.