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Mobile Semi Truck Repair in Dallas–Fort Worth, TX
Your rig sits still, you lose money. Our certified heavy-duty mechanics come to your semi — roadside, weigh station, truck stop, yard or job site — with the tools and parts to fix it on the spot. No tow in most cases, and you approve the price first.
- 24/7 dispatch
- Certified diesel techs
- Upfront quotes
- All Class 8 makes
Semi truck & tractor-trailer repair
Your semi fixed where it stopped — not where the tow takes it
When a semi truck breaks down, every hour on the shoulder costs you the load, the appointment and the driver’s hours. Mobile Diesel Truck Repair brings a fully equipped service truck and a certified heavy-duty mechanic to your breakdown anywhere in the Dallas–Fort Worth Metroplex.
We diagnose with OEM-level software, carry the most common parts, and repair engines, air systems, electrical faults, aftertreatment, drivetrain and suspension on-site. Whether you run local, regional or long-haul, our technicians are available 24 hours a day, 7 days a week.
We service every major make:
What's your semi doing?
Tap the symptom closest to yours. We’ll show the usual causes and how we fix it on-site.
Check engine / derate
- DPF clogged or failed regeneration
- NOx, EGR or DEF sensor fault
- DEF quality or doser problem
Common causes
We read the codes with OEM-level software, run a forced regen if needed and replace the failed sensor on-site.
- Usually repaired on-site
Air leak / low air warning
- Cracked air line or loose fitting
- Leaking gladhands or seals
- Failing air dryer, valve or compressor
How we fix it
We trace the leak, replace lines, fittings or valves and test build-up time before you roll.
- Usually repaired on-site
Won't start
- Dead or weak batteries
- Failed starter or bad ground
- Fuel delivery or air in the fuel system
How we fix it
Battery testing, jump starts, starter replacement and fuel system priming — done where you’re parked.
- Usually repaired on-site
Overheating / coolant leak
- Burst hose or loose clamp
- Failing water pump or thermostat
- Fan clutch or radiator problem
How we fix it
We replace hoses, belts, thermostats and water pumps and pressure-test the cooling system on-site.
- Usually repaired on-site
Loss of power / smoke
- Turbo failure or boost leak
- Clogged fuel filters
- Injector problem
How we fix it
Boost and fuel tests pinpoint the cause; most turbo hoses, filters and injector issues are fixed on the spot.
- Usually repaired on-site
Brakes dragging or locked
- Out-of-adjustment slack adjusters
- Failed brake chamber
- ABS valve or sensor fault
How we fix it
We repair chambers, slack adjusters and ABS components so the truck passes a brake check.
- Usually repaired on-site
Electrical / lights out
- Wiring short or corroded connector
- Failing alternator
- Blown fuse or relay
How we fix it
We trace the circuit, repair wiring, replace alternators and restore tractor and trailer lighting.
- Usually repaired on-site
Clutch or shifting trouble
- Worn clutch or bad adjustment
- Shift actuator or sensor fault
- Low or contaminated fluid
How we fix it
On-site transmission diagnostics, clutch adjustment and many actuator and sensor repairs.
- Usually repaired on-site
Complete semi truck repair
Every major system on your rig, repaired on-site
Our mobile units carry diagnostic laptops, heavy-duty tools and common parts, so most of these repairs are finished in a single visit.
Engine repair & diagnostics
Loss of power, smoke, misfires and fault codes on Cummins, Detroit, PACCAR, CAT, Volvo and Mack engines.
- Loss of power
- Excessive smoke
- Engine misfires
- Turbocharger issues
- Fuel system faults
- Sensor failures
- Oil & coolant leaks
- Fault code troubleshooting
Air brake repair
Your brakes are your safety and your DOT record. We get them working and adjusted before you leave.
- Air brake leaks
- Brake chambers
- Slack adjusters
- ABS warning lights
- Hoses & air lines
- Pads, shoes & drums
Electrical systems
Electrical failures are one of the top causes of semi breakdowns — and one of the fastest to fix on-site.
- Alternators
- Starters
- Batteries
- Wiring failures
- Shorts & grounds
- Trailer lighting
- Dash warnings
- Faulty sensors
DPF, DEF & aftertreatment
Get out of derate and back to full power without a dealer appointment.
- DPF regeneration
- DEF pump replacement
- NOx sensor failure
- SCR system repair
- EGR valve & cooler
- Derate diagnostics
Transmission & driveline
Shifting problems and driveline vibration diagnosed and repaired at your location.
- Transmission diagnostics
- Gear shifting issues
- Clutch replacement
- Driveline & U-joints
- Fluid service
- Actuator & sensor faults
Suspension & steering
Keep the truck level, tracking straight and inspection-ready.
- Air suspension
- Air bags & leveling valves
- Shocks
- Kingpins & bushings
- Tie rods
- Steering gears
Cooling & A/C
Texas heat punishes cooling systems. We stop overheating before it becomes an engine rebuild.
- Radiators
- Hoses & clamps
- Water pumps
- Thermostats
- Fan clutches
- Cab A/C
Fuel system & delivery
Fuel restriction, air in the system or an empty tank — we handle all three.
- Fuel filters
- Lift pumps
- Injectors
- Fuel line leaks
- System priming
- Diesel & DEF delivery
Semi truck tires
Blowouts and flats on the steer, drive or trailer axle replaced at the roadside.
- Tire replacement
- Flat repair
- Steer & drive tires
- Trailer tires
- Lug & stud service
- Pressure checks
Semi down on the shoulder right now?
Pull over safely, hazards on, triangles out — then call. We’ll get your location and send the nearest mechanic.
Complete semi truck repair
Skip the tow. Skip the shop line.
For most semi breakdowns, sending a mechanic to the truck is faster and cheaper than sending the truck to a mechanic. If a repair truly needs a shop lift, we’ll tell you upfront and arrange heavy-duty towing.
Mobile Diesel Truck Repair
Tow to a shop
Getting started
- Mechanic drives to your truck
- Book a tow, then wait for it
Towing cost
- Usually none
- Heavy-duty tow fees added
Downtime
- Most repairs done in one visit
- Waiting for a bay, often days
Where
- Roadside, truck stop, yard or dock
- Only at the shop
Hours
- 24/7, nights and weekends
- Business hours
Pricing
- Quoted upfront before work starts
- Often quoted after teardown
How it works
From breakdown to back on the road
No tow, no waiting room. Here’s what happens after you call.
1
Call dispatch
Tell us your location, truck and symptoms. A real person answers 24/7.
2
Quote & ETA
We confirm the likely fix, the upfront price and the mechanic’s arrival time.
3
On-site repair
Diagnostics and repair right where the semi is parked.
4
Roll again
Clear invoice, test run, and you’re back on the road.
All our services
Explore every mobile diesel service
One team for your truck, trailer, tires and fleet — all delivered to your location across DFW.
Semi Truck Repair
Engine, air brake, electrical and drivetrain repair for Class 8 trucks.
Emergency Roadside Repair
We come to you anywhere in DFW — no tow truck, no shop line.
18 Wheeler Repair
Whole-rig service — tractor, trailer and tires in one visit.
Trailer Repair Services
Brakes, lights, landing gear and suspension for every trailer type.
Diesel Truck Mechanic
Dealer-level diagnostics for semis, box trucks and pickups.
Fleet Maintenance
Preventive maintenance and DOT inspections at your yard.
Mobile Tire Service
Roadside steer, drive and trailer tire repair and replacement.
Not sure what you need?
Call (972) 433-9450 and describe the problem — we'll diagnose it on-site.
Semi truck repair near you
Our mobile semi mechanics are stationed across North Texas. Pick your city for local details.
Semis on the Stemmons, LBJ and I-45 corridors and at Inland Port warehouses.
Regional carriers and delivery semis along US-75 and the Tollway.
Haulers and regional freight on the eastern edge of the metro.
Both branches of the I-35 split and the Alliance logistics corridor.
Warehouse and dock repairs across Carrollton’s industrial parks.
Great Southwest industrial district and the mid-cities.
Trucks running the I-45 lane and Houston-area routes — call to confirm ETA.
- Nearby cities
We also regularly work in Richardson, Irving, Fort Worth, Arlington, Garland, Mesquite, Lewisville, Frisco and McKinney.
FAQs
Semi truck repair questions
Straight answers about response times, pricing and what we fix on-site.
How fast can a mobile mechanic reach my semi in DFW?
Most calls inside the Dallas–Fort Worth metro are reached in about 30 minutes, depending on traffic, time of day and the nearest available service truck. Dispatch gives you a real ETA when you call.
Can you repair my semi truck on the side of the highway?
In most cases, yes. Air leaks, brake chambers, belts, hoses, batteries, starters, alternators, sensors and tires are routinely repaired at the roadside. If it isn’t safe or the repair needs a lift, we arrange heavy-duty towing.
What semi truck brands and engines do you work on?
We repair Freightliner, Peterbilt, Kenworth, International, Volvo, Mack and Western Star trucks with Cummins, Detroit Diesel, PACCAR, Caterpillar, Volvo and Mack engines.
How much does mobile semi truck repair cost?
Every repair is quoted upfront before work begins, so you approve the price first. Cost depends on the repair, parts and location. Call with your truck details and symptoms for a quote — there are no hidden fees.
Can you get my truck out of derate mode?
Yes. We diagnose the aftertreatment fault with OEM-level software, run forced or parked regenerations, and replace failed NOx, EGR and DEF components on-site so the truck returns to full power.
Do you repair semis at truck stops, yards and customer docks?
Yes. We work wherever the truck is parked — truck stops, weigh stations, company yards, customer docks, warehouses and job sites — as long as there’s safe space to work.
Do you offer repairs at night and on weekends?
Yes. Breakdown service runs 24 hours a day, 7 days a week, including holidays.
Do you work with fleets and owner-operators?
Both. Owner-operators can call for one-off repairs, and fleets can set up accounts with priority dispatch and on-site preventive maintenance.
A complete guide to mobile semi truck repair in Dallas–Fort Worth
Dallas–Fort Worth is one of the busiest freight hubs in the country. Thousands of semis move through the I-35, I-30, I-20, I-45 and I-635 corridors every day, serving distribution centers, intermodal yards and the Alliance and Inland Port logistics areas. With that much traffic, breakdowns are a fact of life — and how quickly you get back on the road decides whether you keep the load.
Mobile semi truck repair flips the old model. Instead of towing a 40-ton rig to a shop and waiting for a bay, a certified diesel mechanic comes to the truck with a fully equipped service vehicle, diagnoses the problem and repairs it on the spot.
What is mobile semi truck repair?
Mobile semi truck repair is heavy-duty diesel service performed wherever the truck is parked: a highway shoulder, a truck stop, a weigh station, a company yard or a customer’s dock. Our service trucks carry OEM-level diagnostic software, air tools, jacks, common filters, hoses, belts, sensors, air brake parts and electrical components, so most repairs are completed in one visit.
Common semi truck breakdowns we fix on-site
Air system and brake failures
Air leaks from cracked lines, loose fittings, worn gladhand seals or failing valves are among the most frequent roadside calls. We locate the leak, replace the failed part and confirm the system builds and holds pressure. We also replace brake chambers, adjust or replace slack adjusters and diagnose ABS warning lights.
No-start and electrical problems
Weak batteries, failed starters, corroded grounds and wiring shorts can leave a truck dead at the dock. Our mechanics test the charging and starting circuits, replace batteries, starters and alternators, and repair wiring for both the tractor and the trailer lighting circuit.
Aftertreatment and derate
Modern emissions systems — DPF, DEF and SCR, and EGR — are a common reason trucks drop into derate. We read and interpret fault codes, run forced or parked regenerations, and replace NOx sensors, DEF pumps and EGR components when needed.
Overheating and cooling system leaks
North Texas summers push cooling systems hard. A burst hose, a failing water pump or a stuck fan clutch can overheat an engine quickly. We repair leaks, replace hoses, belts and thermostats, and pressure-test the system before you leave.
Loss of power and engine faults
Turbo failures, boost leaks, clogged fuel filters and injector problems can rob a truck of power or cause heavy smoke. Diagnostic testing pinpoints the cause so we fix the problem instead of guessing at parts.
Brands and engines we service
Our technicians work on Freightliner, Peterbilt, Kenworth, International, Volvo, Mack and Western Star tractors, powered by Cummins (ISX, X15), Detroit Diesel (DD13, DD15), PACCAR (MX-13), Caterpillar, Volvo and Mack engines.
What to do when your semi breaks down
- Pull as far off the roadway as you safely can and turn on your hazard lights.
- Set out reflective triangles behind the truck.
- Note your highway, direction and mile marker, or the nearest exit.
- Write down any warning lights or fault codes on the dash.
- Call (972) 433-9450 and tell dispatch whether you’re hauling hazmat or a reefer load.
Semi truck repair across DFW
We dispatch mobile semi mechanics throughout the metroplex, including Dallas, Plano, Wylie, Denton, Carrollton and Grand Prairie, plus our Houston service area for trucks running the I-45 lane.
Related services
If the trouble is on the trailer, our trailer repair services cover brakes, lights, landing gear and suspension. For the whole rig, see 18 wheeler repair. Night-time and highway breakdowns are handled by our emergency roadside repair team, and blowouts by our mobile tire service. Fleets can avoid many breakdowns entirely with fleet maintenance programs, and our diesel truck mechanics also service box trucks, pickups and RVs.
Why drivers and fleets choose us
- 24/7 availability — nights, weekends and holidays.
- Certified heavy-duty technicians trained on tractor-trailer systems, air brakes, aftertreatment and ECM diagnostics.
- OEM-level diagnostics for engine, transmission, ABS and emissions systems.
- Honest, upfront pricing — estimates before work, no unnecessary repairs.
Get your semi back on the road — without the tow.
Call now for 24/7 mobile semi truck repair anywhere in Dallas–Fort Worth.