Diesel · Craig, CO
Cummins Diesel Repair
From the 5.9 to the 6.7, we know the Cummins inside out, and we fix it for less than the dealer, without the wait.
Average rating
Google reviews
Years, since 1985
Mile warranty
Quick answer
What Cummins problems do you repair?
We service all common Cummins issues, injector and fuel system failures, turbo problems, EGR and DPF/regen faults, lift pump replacement, and head gasket work, on 5.9L and 6.7L Ram trucks and fleets. We diagnose accurately and fix it right, typically saving thousands over a dealer quote.
What's included
- Injector, lift pump, and fuel system repair
- Turbo diagnosis and replacement
- EGR, DPF, and regen (emissions) service
- Head gasket, cooling, and preventive maintenance

Built for the Yampa Valley
Ranchers, oil & gas crews, and contractors across the Yampa Valley run Cummins-powered trucks for work. We keep them earning with fast, fair diesel service.
Why Chapman's for this
- Free digital inspection with photos
- Transparent pricing, quoted before we start
- Loaner cars, shuttle & pickup
- 5yr / 50,000-mile warranty
What customers say
“Our brakes went out suddenly while we were in town and Chapman's took care of us! We requested some extra work while we were there, which included ordering some specialty parts. They were as fast as they could have been when squeezing us in last minute, and courteous as the day is long. Excellent customer service, keeping us as up to date as possible, not doing work until we approved it, and providing a loaner as we are not local and our truck is our only transport. Our truck is now in tip top shape and worthy to pull our rig again. Highly recommend this shop! Thank you Chapman's!”
Willow W.
3 weeks ago
“Dropped in to check them out and get a competitive quote on repairs. They did a full diagnostic at no charge with service recommendations and costs. Came back the next day for service. They went out of their way to make me feel a valued customer, including a loaner car. Work was done professionally, including a quality control drive before turning the car over to me. Price was very good. Worth the trip.”
Harvey G.
3 months ago
“Just had a great experience at Chapman Automotive and had to share. Cole, Kyle, and the whole team were awesome to work with—super understanding, patient, and most importantly, realistic about what actually needed to be done and what it would cost. No pressure, no upselling, just straight-up honest service. I brought in my diesel truck expecting the worst after getting some pretty high quotes in Steamboat, and they ended up saving me over $3k on the repairs. That kind of honesty and transparency is hard to find. Really appreciate a shop that treats you like a person and not just another invoice. Highly recommend these guys if you want solid work and people you can trust.”
Nathan B.
4 months ago
Frequently asked questions
Yes. We diagnose and repair EGR, DPF, and regeneration faults properly so your truck runs clean and stops throwing codes, without guesswork.
Routinely. One customer saved over $3,000 versus the quote on a diesel repair. Same expertise, no dealer markup, and a faster turnaround.
Ready for cummins repair?
Book online in under a minute, or call and talk to a real person. Craig, CO · Yampa Valley.
