Mobile Semi Truck Repair in Dallas, TX for Class 4-8 Fleets
If you run trucks out of Dallas or Fort Worth, you know the pattern: hauling a truck to a shop, waiting days for a bay, and an invoice that never matches the quote. Letdown after letdown, and the downtime costs pile up fast. AFS Fleet is built to end that. We bring mobile semi truck repair to your yard or the roadside for medium- and heavy-duty fleet trucks across DFW, so your truck gets fixed where it sits. A job is not done until your truck is actually going right. Every repair, every inspection, every invoice, in one place with no surprises.
Every hour your truck sits, you lose money
A truck stuck waiting for a shop is not just a repair bill. It is a missed load, a driver on the clock with no miles, and a customer wondering where their freight is. The towing and the days in line only add to it. Then comes the part that stings most: the invoice that runs hundreds over the number you were quoted, or the same failure showing up again next week because the first fix was rushed. In a market like Dallas, with DFW freight lanes running constantly and Texas heat pushing cooling and electrical systems hard, one slow or sloppy repair sets off a chain of them. Mobile repair breaks that cycle by getting a technician to your truck instead of your truck to a bay, and that is exactly what AFS is here to do.
Dallas mobile semi truck repair done right the first time
AFS Fleet brings vetted mobile diesel technicians and a national service network to wherever your trucks are, so your fleet gets consistent, high-quality repair every time, not a one-shop gamble. You get clearer answers on what is needed and what it costs, faster turnarounds whether the truck is roadside or onsite at your yard, and experts on every job who take pride in work that holds up. That is how everything gets going right instead of just good enough.
Which truck classes we service: Class 4 through Class 8
Not sure where your trucks fall? Here is the plain version. Medium-duty covers Class 4 through Class 6, think box trucks, delivery trucks, and larger work trucks. Heavy-duty covers Class 7 and Class 8, including day cabs, sleeper semis, dump trucks, and the tractors pulling your freight. Our mobile units service all of them, Class 4 through Class 8, plus trailers up to 53 feet. If it hauls your loads or supports your operation, we come repair it. You do not need to know your exact class to call us. Tell us what the truck does and where it is, and we will take it from there.Not sure where your trucks fall? Here is the plain version. Medium-duty covers Class 4 through Class 6, think box trucks, delivery trucks, and larger work trucks. Heavy-duty covers Class 7 and Class 8, including day cabs, sleeper semis, dump trucks, and the tractors pulling your freight. Our mobile units service all of them, Class 4 through Class 8, plus trailers up to 53 feet. If it hauls your loads or supports your operation, we come repair it. You do not need to know your exact class to call us. Tell us what the truck does and where it is, and we will take it from there.
What our mobile units repair
Our Dallas mobile technicians handle the full range of medium- and heavy-duty work at your yard or the roadside, from routine service to major breakdowns. That includes engine and general diesel diagnostics, transmission and clutch repair, drivetrain and axle work, suspension, brakes, exhaust and emissions systems, cooling and A/C for Texas heat, electrical faults and derate or power-loss issues, and DOT inspections. Explore specific services below, or call and describe the problem and we will route it to the right expert. Start with our full Truck Repair menu, General Diesel Repair, Truck Transmission Repair, or Semi Truck Exhaust Repair.
Mobile repair that comes to your yard or the roadside
This is how AFS is built. Our Mobile Trailer & Truck Repair units serve fleets across the Dallas-Fort Worth Metroplex, handling roadside breakdowns and onsite repairs so your driver is not stranded and your yard keeps moving, no tow and no waiting in a shop line. Whether you need a single truck back running or recurring coverage across your whole fleet, our Mobile Services and Onsite Services teams bring the shop to you. For fleets that want to stay ahead of failures, our mobile Truck Preventative Maintenance program schedules service at your yard before small issues become breakdowns, which is the cheapest downtime you will ever buy.
No-surprise invoicing: the price you see is the price you pay
Repair costs vary with the job. A brake or fluid service runs modest, while a major engine, transmission, or aftertreatment rebuild is one of the most expensive repairs a semi can need, often reaching into the thousands. What should never vary is whether the invoice matches the quote. Before our tech starts work at your yard or the roadside, you see the scope and the price. When the work is done, the invoice matches what we agreed on. No mystery two-hour minimums, no line items you never approved. That transparency is the whole point at AFS, because invoicing surprises are exactly the letdown we exist to end.
Faster turnarounds so your truck gets back to earning
Long waits are a fleet’s biggest hidden cost, so we treat speed as part of the job. With a network of mobile technicians across DFW, we dispatch to your truck and get it diagnosed quickly instead of leaving it in line for days. Roadside or onsite at your yard, the goal is the same: an accurate diagnosis fast, the right parts on the truck, and your equipment back on the road as soon as it is safely going right.
It isn't done until it's actually going right
Installed is not the same as fixed. Replaced is not the same as running right. At AFS, our mobile technician verifies the repair is working before leaving your yard, so you are not paying twice for the same problem. Our technicians work to pride-of-work standards and are treated right themselves, which is why the fixes hold up. That is the everything standard: every service, every repair, every inspection, and every invoice, done right the first time.
What Dallas fleets say about AFS
Cintas, McLane, Ryder, Walmart, Penske, Kroger, Budd Van Lines, and FleetNet America trust AFS to keep their trucks and trailers moving across DFW.
“Road tech Josh worked on one of our trailers. He had outstanding communication through his troubleshooting. Got our truck on the road right away.”
Jorge G.
Want to read more reviews? Click here to see our 100+ Google 5-star reviews or search AFS Dallas Fort Worth Mobile & Onsite Truck and Trailer Repair!
“Great service. Fast, professional. They were able to squeeze me in and took care of my truck within an hour. Thanks Anthony S and Lisa.”
Jeff O.
“We were very pleased with the professionals at AFS. Not only was everyone kind, they made our service as seamless as possible. I would recommend this company to anyone!”
Milo V.
Get a straight quote and get your fleet going right
Here is what you get with AFS: a mobile technician comes to your yard or the roadside, you see the scope and price before work starts and the invoice matches, every repair is verified going right instead of just replaced, quality stays consistent because it is backed by a vetted national network, and every service, repair, inspection, and invoice runs through one place so you are not juggling vendors. Call now for urgent mobile repair, or request service for planning ahead and we will give you a straight quote.
Mobile semi truck repair questions, answered
What are the most common semi-truck repairs?
The repairs we see most on Dallas fleets are brake work, tire and wheel-end service, electrical and battery faults, cooling system and A/C failures pushed by Texas heat, DEF and aftertreatment or derate issues, air and suspension problems, and transmission and clutch wear. Most of these our mobile units can handle right at your yard, and most are far cheaper to catch early through preventative maintenance than to fix after a roadside breakdown.
What is the most expensive repair on a semi-truck?
A full engine overhaul or replacement is typically the most expensive repair, often running well into five figures, followed by transmission rebuilds and aftertreatment or DPF system replacements. Because these are the costly ones, AFS quotes them clearly before any work starts, so a major repair never comes with a surprise on the invoice.
How much does it cost to fix a semi-truck?
It depends on the job. Routine services like oil changes or a brake job are relatively low cost, while major engine or transmission work reaches into the thousands. Rather than guess, call AFS and describe the issue. We dispatch a mobile tech to inspect, give you a clear scope and price up front, and the final invoice matches what you approved.
How do I find a reliable mobile semi-truck mechanic in Dallas?
Look for verified reviews, clear up-front pricing, named clients, and a promise that the work is actually done right rather than just replaced. AFS Fleet checks every box: strong Google reviews, no-surprise invoicing, marquee fleets like U.S. Xpress and Red Bull, and a network of vetted mobile technicians who come to your yard and back consistent quality across DFW.
