Paccar in Denver, CO and Kalispell, MT

Keep your PACCAR engine in top shape with Iron Buffalo. Our team provides professional PACCAR repair—diagnostics, emissions service, and mobile support for MX-11 and MX-13 platforms.

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Colorado

Montana

Paccar Repair & Maintenance in Denver, CO, and Kalispell, MT

PACCAR engines power some of the most advanced trucks on the road today—but even the best diesel systems require expert care. At Iron Buffalo, we provide full-service PACCAR repair in Denver, CO and Kalispell, MT. Whether you're dealing with derate conditions, turbo actuator faults, or DPF inefficiency, we offer fast, precise service that gets your truck back to full capacity. We provide both in-shop and 24/7 mobile PACCAR engine repair to keep your downtime to a minimum.

Complete PACCAR Engine Services

Iron Buffalo specializes in diagnostics and mechanical repair for PACCAR diesel platforms. Our services include:

MX-11 and MX-13 engine diagnostics and repair
ECM troubleshooting and software updates
Fuel system inspection and injector testing
Turbocharger repair and actuator calibration
Valve adjustment and overhead inspections
EGR, SCR, and DPF aftertreatment service
DEF dosing and emissions system repairs
Regeneration system support
Fault code clearing and sensor replacement

We service both vocational and long-haul trucks powered by PACCAR systems with OEM-level precision and parts.

Benefits of PACCAR Engines

PACCAR engines are engineered for fuel efficiency, power delivery, and reduced emissions. Found in Kenworth and Peterbilt trucks, the MX-11 and MX-13 deliver excellent torque-to-weight ratios and are built with durability in mind.

Their advanced ECMs allow for smart diagnostics and early fault detection, while lightweight construction improves overall vehicle efficiency. PACCAR’s integrated engine-transmission-emissions systems also reduce service intervals and simplify maintenance.

Need PACCAR Engine Repairs?

If your PACCAR engine is underperforming or showing warning codes, call Iron Buffalo at 303-623-7049 (Denver) or 406-890-7001 (Kalispell). We’ll restore performance with expert diagnostics and repair.

FAQs

What Areas Do You Serve?

We offer 24/7 mobile repairs and roadside assistance in the following areas:

Colorado: Boulder, CO; Aurora, CO; Centennial, CO; Fort Collins, CO; Greeley, CO; Georgetown, CO; Brighton, CO; Castle Rock, CO; Colorado Springs, CO; and Longmont, CO.

Montana: Whitefish, MT; Bigfork, MT; Somers, MT; Polebridge, MT; Thompson Falls, MT; Polson, MT; Rollins, MT; Libby, MT; and Eureka, MT.

What PACCAR Engines Do You Work On?

We service MX-11, MX-13, and PX engines in all Kenworth and Peterbilt models. We also provide diagnostics for PACCAR’s aftertreatment and emissions systems.

Do You Perform On-Site PACCAR Diagnostics?

Yes. Our mobile units are equipped with PACCAR-compatible software for fault code reading, emissions testing, and basic repairs in the field.

How Can I Get in Touch?

If you're ready to schedule diesel repairs, call Iron Buffalo today at 303-623-7049 (Denver) or 406-890-7001 (Kalispell).

Manufacturers

Customer testimonials

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"I highly recommend this shop. I had luke a technician there do some work on my truck after a ford dealership took 6 days and failed to acknowledge my warranty on 3 leaking oil spots on my truck.Once the dealership screwed me over I took my truck here. Luke was very impressive, fast and communicative. He provided me photos. He kept me updated on everything he did. I still have a warranty through ford but apparently it’s useless. I don’t think I’ll ever go back to them considering how they treated me. Luke is a solid technician who is very skilled. I can’t recommend him enough. Thank you."

Tristen

"Our truck broke down just as we were getting into Denver. It was a major repair and they accomplished it quickly and we were back in our truck. Everyone there was very professional and nice to work with. The unhappy news of a major repair was actually a good experience. Definitely recommend Iron Buffalo."

Kelly

"I’m glad I went to this shop. I was so worried it would be another back door mechanic wanting to swindle me. It was anything but. Shannon was super kind and went way out of his way getting me in right away. And Steve was a professional from start to finish in assisting with the work being done. I’m really appreciative and would 100% use this shop again."

Kristin

"Steven Riddle is the best service writer if ever dealt with. He is very knowledgeable, I called with starting issues. With in 1hour try had my truck towed in. That day they had it diagnosed then next day they found the parts. Great job, I will be using in the future. Thanks a lot."

Mike

"Kanisha was great, I had been trying to get my small hydraulic cylinder repaired for quite some time and she was the first person that said "YES" she was honest about needing to look first. She was willing to listen and explained the process. When I came in she was polite and professional. She communicated like she said she would and got it taken car of! I'll recommend Kanisha and Iron Buffalo!"

Lance

"I'm very happy with the service I received from Iron Buffalo Holdings I highly recommend this shop. I got an Inspection & a DYNO done on my Semi Truck. Canesha was prompt and courteous."

Miko

"Had a break down with the ol’ Pete they picked up and were available l. They aren’t the cheapest but heck you get what you pay for. If you want your rig or RV fixed so you can head one down the road these guys are nice and they can almost always get done in a day if you need it."

Bryan

Light, Medium & Heavy-Duty Truck Repair Services in Denver, CO & Kalispell, MT

Trusted Diesel Repair & Fleet Services - Keeping You on the Road & Job Site

Commerce City, CO

5590 E 55th St, Commerce, City, CO

303-623-7049

Kalispel, MT

104 Rocky Cliff Lane, Unit 1, Kalispell, MT

406-890-7001