Diesel & Auto Repair in Johnstown, Colorado
Reliable repairs, fair pricing, and ASE-certified technicians who take the time to do things right.
A Small-Town Shop That Puts People First
At NoCo Diesel & Auto, you’re not just another ticket number. We’re a locally owned shop that believes in honest work, straightforward communication, and repairs you can trust.
We specialize in GM Duramax diesel trucks, but our ASE-certified team works on all makes and models, from daily drivers to heavy-duty and semi trucks. Whether you’re here for routine maintenance or major repairs, you’ll get clear answers, fair pricing, and a team that treats your vehicle like it’s our own.
WHY DRIVERS CHOOSE US
ASE-Certified Technicians
Your vehicle is in the hands of trained professionals who know how to diagnose and repair things the right way.
duramax diesel experts
From injectors to fuel systems to complex diagnostics — this is our specialty.
Honest Work, No Upselling
We don’t push unnecessary repairs. We tell you what’s needed, what can wait, and what it will cost.
Personal, Local Service
We take pride in treating every customer with the same respect, attention, and appreciation.
A Small-Town Shop That Puts People First
Duramax specialists • Fuel systems • Turbos • Injectors • Emissions systems • Diagnostics • Maintenance • Heavy-duty and commercial diesel
Brakes • Suspension • Steering • Electrical • Heating & cooling • Engine diagnostics • Routine maintenance • All makes & models
Semi trucks • Medium and heavy-duty vehicles • Fleet maintenance • Commercial service plans
OUR PROMISE TO YOU
We stand behind every repair we do. If something isn’t right, we’ll make it right — and we’ll work through it with you. That’s how a small-town shop should operate.
rated 5 stars on google
“Best and Most ethical Mechanic I have worked with. Pricing is always extremely reasonable and fair. Worth his weight in Gold.”
– James Trull
CALL TO SCHEDULE SERVICE
Phone is the best way to reach us — give us a call to book your appointment.