Expert Semi-truck & Diesel Truck Repair You Can Rely on
24/7 Mobile Truck Repair, Roadside Service and Diesel Repair Across AZ and NM
Breakdowns never wait—and neither do we. Cornwell’s Truck Repair delivers 24/7 mobile truck repair, roadside diesel service, towing, and full-service shop repairs across Arizona and New Mexico. Since 2008, truck drivers have relied on our ASE-certified diesel technicians to respond fast, repair accurately, and keep freight moving.
Whether you’re stuck on the I-10 corridor, parked at a rest area, or need heavy-duty shop work, we come to you and get the job done right.
We Come to You—Roadside Diesel and Semi Repair
When every minute counts, our mobile service trucks arrive fully equipped to diagnose and repair most breakdowns on-site, including:
- Batteries, starters and alternators
- Brake chambers and air leaks
- Fuel delivery issues
- Coolant leaks and hoses
- Electrical shorts
- No-start problems
- DPF/DEF/emissions issues
- Diesel diagnostics and forced regenerations
- Tire replacement and repair
Need more than roadside repairs? We offer 24/7 towing directly to our diesel shops.
Two Full-Service Repair Shops + I-10 Corridor Coverage
Cornwell’s operates two strategic locations servicing trucks throughout the Southwest:
- Tucson, AZ
- San Simon, AZ
With rapid access to I-10, AZ-77, AZ-86, US-191, and I-19, we support truck traffic moving between:
➡ Arizona ↔ New Mexico
➡ Border routes ↔ Distribution hubs
See our location pages:
Heavy-Duty Truck, Diesel and Trailer Repair
Whether mobile or in-shop, our certified technicians deliver complete service:
- Semi-truck repair
- Diesel engine diagnostics
- Transmission and clutch repair
- Driveline and differential service
- DOT inspections
- Trailer repair
- Preventive maintenance and fleet programs
Explore service pages:
24/7 Towing—Light, Medium and Heavy-Duty
If mobile repair isn’t possible, we dispatch heavy-duty wreckers to tow semis, tractors, trailers, buses, RVs, and commercial vehicles back to the nearest shop—anytime, day or night.
Why Truckers Choose Cornwell’s
Drivers and fleet managers trust Cornwell’s because we offer:
24/7 emergency service
Mobile repairs at your breakdown location
Heavy-duty towing
ASE-certified diesel technicians
Two full-service shop locations
Fast response on the I-10 corridor
15+ years of proven results
Trusted 5-star reviews from truckers
We fix trucks right the first time—and get you rolling fast.
Trusted by Truckers—Backed by 5-Star Reviews
Our customers consistently praise:
“Showed up fast, had every part needed, saved a tow bill.”
“Honest pricing and outstanding diesel knowledge.”
“Mobile repair got us moving in under an hour.”
Every review reflects one mission—protect your uptime.
Preventive Maintenance and Fleet Programs
Avoid breakdowns before they happen with scheduled fleet services:
- Oil and filter programs
- DOT prep
- Tire management
- Scheduled inspections
- Recordkeeping
Perfect for logistics fleets, municipal, agricultural, and construction trucks.
Service Areas Across AZ and NM
We proudly serve:
𖡡 Tucson, AZ
𖡡 Eloy, AZ
𖡡 Gila Bend, AZ
𖡡 Oro Valley, AZ
𖡡 Avra Valley, AZ
𖡡 Yuma, AZ
𖡡 Sierra Vista, AZ
𖡡 Safford, AZ
𖡡 Morenci, AZ
𖡡 Thatcher, AZ
𖡡 Douglas, AZ
𖡡 Morenci, AZ
➡
All Service Area Pages
Frequently Asked Questions
Do you provide mobile truck repair 24/7?
Yes—we dispatch anytime for roadside diesel service.
Can you diagnose check-engine lights on the road?
Yes—we bring full diesel diagnostic systems.
Do you tow heavy trucks?
Absolutely—tractors, trailers, RVs, buses, and commercial rigs.
Do you serve New Mexico?
Yes—especially Lordsburg and the I-19 and I-10 corridor.
Can you work on fleets?
Yes—we provide fleet maintenance programs.
Call Now—24/7 Emergency Dispatch
📞 Need roadside repair? Call now—we come to you.
Fast response. Honest pricing. Certified diesel technicians.