Seguin, Texas · Est. 2017
Texas Heavy
Line Diesel
Repair
Serving San Antonio, Seguin, San Marcos, and Austin. When your diesel goes down, H&H gets you back on the road — fast, honest, and done right the first time.
What We Do
Heavy Line Services
Equipment & Brands We Service
Why Choose Us
We Know
Diesel.
Period.
H&H Diesel Services provides professional heavy-duty diesel repair, mobile fleet service, and emergency roadside assistance for commercial trucks and equipment across Seguin, San Antonio, New Braunfels, San Marcos, Kyle, Austin, McQueeny, Pleasanton, and Corpus Christi, TX. With more than 22 years of hands-on experience, our team delivers dealership-level diagnostics, heavy-line engine repair, transmission service, electrical troubleshooting, and full preventive maintenance programs designed to keep fleets running reliably and efficiently. Whether your truck needs an in-shop overhaul or on-site mobile repair, we bring the tools, expertise, and fast turnaround times that Texas fleets depend on.
We support owner-operators, small fleets, and large commercial operations with engine overhauls, transmission repair, electrical diagnostics, fleet maintenance, mobile service, and 24/7 roadside diesel repair. Our technicians use OEM-level software and advanced diagnostic equipment to accurately identify issues and get your truck back on the road with minimal downtime. From the I-10 and I-35 corridors to the oilfield routes near Pleasanton and the coastal lanes around Corpus Christi, H&H Diesel Services is the trusted partner for reliable, honest, and high-quality diesel repair throughout Central and South Texas.
Fleet Accounts
Priority scheduling and dedicated service coordinators for fleet operators.
All Major Brands
Cummins, Detroit, CAT, Paccar, Volvo, John Deere, and more.
Fast Turnaround
We understand downtime costs money. We work fast without cutting corners.
Honest Pricing
Upfront estimates, no surprises. We earn your trust on every job.
What They Say
Trusted by Texas
H&H has been our go-to shop for three years. They keep our 40-truck fleet rolling with minimal downtime. Fast, honest, and they know diesel inside and out.
Had a catastrophic engine failure on I-35 at 2am. H&H had a tech on-site within the hour and got us moving by morning. That's the kind of service you can't put a price on.
We run Cat and John Deere equipment on job sites across South Texas. H&H handles everything — no job too big, no excuse too small.
Ready to Roll?
Let's Get
Your Diesel
Running.
Whether you need a quote, have an emergency, or want to set up a fleet account — we're ready. Call us or fill out our contact form and we'll get back to you within the hour.