- Denver's Trusted Diesel Specialists
FAST, RELIABLE DIESEL REPAIR FOR FLEETS & INDEPENDENT OPERATORS
At Welby Diesel Repair, we fix diesel trucks right — no guesswork, no delays. We serve independent drivers and fleet operators who expect more than patchwork fixes.
Certified for Major Diesel Brands
WHEN YOUR TRUCK'S DOWN,YOUR BUSINESS STOPS
THE PROBLEM
- Missed deliveries. Lost income. Idle trucks.
- Shops that waste your time or guess at the problem
- No clear answers. No straight talk.
THE SOLUTION
At Welby Diesel Repair, we fix diesel trucks right — no guesswork, no delays. We serve independent drivers and fleet operators who expect more than patchwork fixes.
- Honest diagnostics
- Dealer-level repair quality
- Zero upsells — just solutions
HOW IT YOUR WORKS
Call or Request a Callback
Speak directly to our lead tech or our 24/7 AI agent.
Bring Your Truck In
We diagnose the issue and explain exactly what's needed.
Get It Fixed Right — Fast
You approve the work. We fix it. You're back on the road.
REAL RESULTS FOR FLEET MANAGERS AND OWNER-OPERATORS
- "Back on the road in 48 hours — not 2 weeks."
- "No repeat issues — they fix it right the first time."
- "Finally, a shop that explains things in plain English."
FLEET MANAGER BENEFITS
- Honest diagnostics
- Dealer-level repair quality
- Zero upsells — just solutions
WHAT OUR CUSTOMERS SAY
Happy Trucks, Happy Clients
“I was stuck on the road with engine trouble, and Welby Diesel Repair had me back up and running the same day. Honest, fast, and reliable service—I won’t take my truck anywhere else!”
Dennis Burke
“Finally found a shop that knows diesel engines inside and out. The diagnostics were spot-on, and they explained everything clearly before doing the work. Great experience!”
Tyler Garza
“Their team takes care of our entire fleet, and downtime has dropped dramatically since we started using them. Preventative maintenance is always on point, and they treat us like family.”
Carol Greene
“Welby Diesel Repair rebuilt my suspension and trailer setup better than new. The ride is smooth, and I feel confident hauling heavy loads again. Highly recommend their crew.”
Rose Galler
OUR CORE SERVICES
We handle everything from diagnostics to full engine overhauls. In-shop service only.
Diagnostics
Transmission
A/C & HVAC
Electrical & ABS
Brakes & Suspension
Engine Overhaul
LET'S GET YOUR TRUCK FIXED RIGHT — STARTING NOW
Call now to speak with our lead technician or 24/7 AI assistant. Prefer us to call you? Tap “Request Callback.”