Knoxville, TN · Open 24/7/365
Mobile Diesel Mechanic in Knoxville, TN
Truck down on I-40, I-75, or I-640? We bring the repair to you — shoulder, truck stop, yard, or jobsite. Roadside service for semi trucks, trailers, reefers, and work trucks across Knoxville and East Tennessee, day or night.
- 24 hours · 7 days · 365
- We come to the truck
- All major makes
Semi truck repair that comes to you
Knoxville’s mobile diesel repair service
When a semi truck, 18-wheeler, or heavy-duty work truck breaks down around Knoxville, the usual answer is a wrecker and a shop queue. We skip both. Knoxville Mobile Diesel sends a diesel mechanic in a fully equipped service truck straight to the truck — the shoulder of I-40 or I-75, a truck stop lot at Watt Road or Strawberry Plains, a distribution center dock, or a jobsite in Blount or Loudon County.
Most commercial truck breakdowns come down to parts that can be fixed where the truck sits: air lines and brake chambers, tires, batteries and starters, belts and hoses, fuel filters, and emissions sensors. We handle 24/7 roadside assistance, mobile semi truck repair, truck tire service, diesel engine diagnostics, and trailer repair — plus DOT inspections and fleet maintenance at your yard.
Whether you’re an owner-operator passing through on I-81 or a local fleet running out of East Knoxville, it’s the same number and the same answer: a mechanic on the way, any hour of the day.
What we fix
Mobile truck & trailer repair, done where you are
From a blown steer tire on I-75 to a DEF derate at a distribution center in East Knoxville, these are the repairs we bring to the truck — no wrecker required.
Roadside & Emergency
For the truck that just quit — on an interstate shoulder, in a truck stop lot, or at a customer’s dock.
Emergency Roadside Assistance
Round-the-clock breakdown help around Knoxville. No-starts, air leaks, blowouts, derates, and warning lights handled where the truck stopped.
See what’s includedMobile Truck Repair
Engine, air, electrical, and chassis repairs done where the truck is parked — your yard, a truck stop, a jobsite, or the shoulder.
See what’s includedMobile Tire Service
Blowouts and flats on steer, drive, and trailer tires. Commercial tire changes on the shoulder, at the truck stop, or in your yard.
See what’s includedJump Start & Fuel Delivery
Dead batteries, empty tanks, and cold-weather no-starts. Heavy-duty jumps, battery testing, and diesel brought to the truck.
See what’s includedLockout Service
Keys on the seat and the door shut — maybe with the engine running? We get you back in the cab without breaking glass.
See what’s includedEngine, Emissions & Electrical
Dash lights, derates, overheating on the grades, and cold-morning no-starts — diagnosed and fixed at the truck.
Diesel Engine Diagnostics
Check-engine light, derate, or fault codes? We plug in at the truck and tell you what failed and whether it’s safe to keep driving.
See what’s includedDPF, DEF & Regen Service
Aftertreatment faults, DEF derates, loaded DPFs, and regens that won’t finish. Parked regens on site when allowed, plus sensor and DEF repairs.
See what’s includedFuel System Repair
Fuel restriction, gelled fuel, air in the lines, leaks, and hard starts. Filters, water separators, lift pumps, and lines repaired on site.
See what’s includedCooling System & Radiator Repair
Overheating on a grade, coolant leaks, blown hoses, broken belts, and bad fan clutches. Cooling repairs on site before heat ruins the engine.
See what’s includedTruck A/C Repair
East Tennessee summers are hot and sticky. A/C compressor, condenser, blower, and refrigerant leak repairs at your truck.
See what’s includedElectrical & Charging Repair
Dead batteries, bad alternators, failed starters, lights out, and corroded wiring. Electrical diagnosis and repair at your truck.
See what’s includedBrakes, Air & Chassis
Air brakes, air lines, hydraulics, suspension, and driveline — the systems inspectors look at first.
Air Brake Service
Air leaks, brakes out of adjustment, dragging or locked brakes, and low-air warnings. Air brake repair on tractors and trailers.
See what’s includedSuspension & Driveline Repair
Blown air bags, broken springs, bad shocks, U-joints, driveshafts, and wheel seals. Chassis and driveline repairs done on site.
See what’s includedHydraulic Hose & Air Line Repair
Blown hydraulic hoses on dump trucks, wet kits, roll-offs, and liftgates, plus air line and fitting leaks. Hoses replaced on site.
See what’s includedTrailer, Reefer & Welding
Dry vans, reefers, flatbeds, dump bodies, and the steel that holds them together.
Trailer Repair
Dry vans, reefers, flatbeds, and lowboys. Trailer brakes, lights, air lines, landing gear, doors, and suspension fixed where the trailer sits.
See what’s includedReefer Unit Repair
Reefer won’t start, won’t hold temp, or throwing alarms? Mobile refrigeration unit repair for Thermo King and Carrier Transicold units.
See what’s includedMobile Welding
Cracked brackets, broken mounts, trailer crossmembers, dump bodies, and bumpers. Welding and fabrication brought to your truck, trailer, or jobsite.
See what’s includedFleet & Compliance
Annual inspections and scheduled maintenance done in your yard, so trucks stay on the road.
DOT Inspection
Annual DOT inspections and pre-inspection checkups at your yard. Find and fix defects before a roadside inspector does.
See what’s includedFleet Preventive Maintenance
PM service at your yard: oil, filters, lube, and inspections on schedule — plus winterizing before the first freeze.
See what’s includedCoverage map
Knoxville & East Tennessee
- Interstate
- U.S. highway
- State route
- Service area
- Also covered
Knoxville Mobile Diesel covers Knoxville and Knox County plus Farragut, Maryville and Alcoa, Oak Ridge, Clinton, Lenoir City and Loudon, Sevierville and Pigeon Forge, and Morristown — and the towns in between. Simplified map — not for navigation.
Service areas
Knoxville and the towns around it
Based in Knoxville and covering Knox, Blount, Anderson, Loudon, Sevier, Jefferson, and Hamblen counties along I-40, I-75, and I-81.
- Knoxville
- Farragut
- Maryville & Alcoa
- Oak Ridge
- Clinton
- Lenoir City & Loudon
- Sevierville & Pigeon Forge
- Morristown
Also covering Powell, Halls, Karns, Strawberry Plains, Kodak, Dandridge, Jefferson City, Seymour, Lake City, Kingston, and the roads in between. Somewhere else in East Tennessee? Call — dispatch will tell you straight whether a mechanic can reach you.
Before you call
Four things that get you rolling faster
Have these answers ready and the mechanic can show up with the right parts the first time.
Location
Interstate, direction, and the nearest exit or mile marker — or the truck stop, yard, or business name. A map pin helps.
The truck
Year, make, model, and engine of the tractor, plus trailer or reefer details if that’s where the trouble is.
The problem
Dash lights, derate, air leak, blown tire, no-start — what you saw, heard, or smelled right before.
Load & access
Loaded or empty, hazmat or reefer setpoint, and any gate code or yard contact we’ll need.
Where we run
Built around the interstates that meet in Knoxville
Knoxville is where I-40 and I-75 come together and I-81 splits off toward Virginia, which makes it one of the busiest freight crossroads in the Southeast. Most of that traffic funnels through a few spots: the I-40/I-75 overlap in West Knoxville, the I-640 bypass around downtown, and the truck stop clusters at Watt Road and Strawberry Plains.
We work those roads every day, along with Pellissippi Parkway, Alcoa Highway, and the routes out to Oak Ridge, Maryville, Sevierville, and Morristown.
- I-40I-40Kingston through Knoxville to the I-81 split — Watt Road, the scales, downtown, and Strawberry Plains.
- I-75I-75Loudon County, the I-40 overlap, Sharps Gap, Powell, Raccoon Valley, Clinton, and Lake City.
- I-81I-81From the I-40 split near Dandridge through White Pine and Morristown.
- I-640I-640The downtown bypass — I-75 traffic, the required hazmat route, and Sharps Gap.
- I-140Pellissippi ParkwaySR 162 and I-140 — Oak Ridge, Hardin Valley, I-40, the river bridge, and Alcoa Highway.
- US 129Alcoa Highway (US-129)US-129 from I-40 across the river past the airport to Alcoa and Maryville.
Why drivers call us
A mobile shop for East Tennessee trucks
- Open 24/7/365Nights, weekends, and holidays. Trucks break down on their schedule, not ours.
- We come to youShoulder, truck stop, yard, dock, or jobsite. No wrecker bill for a problem that can be fixed where the truck sits.
- Honest callsIf a job really needs a shop and a lift, we’ll tell you up front instead of wasting your hours on the shoulder.
- Every major makeFreightliner, Peterbilt, Kenworth, Volvo, Mack, International, Western Star — tractors, trailers, reefers, and work trucks.
- Owner-operators & fleetsOne truck or fifty, same number, same dispatch.
- We know these roadsThe grades, the work zones, the scales, and which exits have room to work.
Common questions
Mobile diesel mechanic FAQ
Do you come to the truck, or do I need a tow?
We come to you. A mobile diesel mechanic drives to the truck — interstate shoulder, truck stop, yard, dock, or jobsite — and repairs it there whenever the job can be done on site. If it really needs a shop, we say so up front so you can arrange a tow without losing more time.
Are you really open 24 hours?
Yes. Dispatch is open 24 hours a day, 7 days a week, 365 days a year — nights, weekends, and holidays.
What trucks do you work on?
Class 6 through Class 8 diesel trucks — semis, straight trucks, and heavy work trucks — plus the trailers behind them: Freightliner, Peterbilt, Kenworth, Volvo, Mack, International, and Western Star tractors, day cabs, yard tractors, box trucks, dump trucks, reefers, dry vans, and flatbeds.
What does a mobile diesel mechanic cost?
It depends on the repair, the parts, how far the mechanic travels, and the time of day. Describe the problem and your location when you call and ask for pricing up front.
How fast can you get to me?
That depends on where the truck is and on traffic — the I-40/I-75 stretch through West Knoxville and I-640 at rush hour can change drive times a lot. Dispatch gives you an estimated arrival time on the call.
Is there a mobile diesel mechanic near me?
If your truck is anywhere around Knoxville — Knox County, the I-40, I-75, and I-81 corridors, or the towns around them — yes. Call (865) 500-4283 with your location and dispatch will send a mechanic to you.
What areas do you cover?
Knoxville and Knox County, plus Farragut, Maryville and Alcoa, Oak Ridge, Clinton, Lenoir City and Loudon, Sevierville and Pigeon Forge, and Morristown. See all service areas.
Do you do DOT inspections and fleet maintenance too?
Yes. Along with breakdowns, we perform DOT inspections and preventive maintenance at your yard so trucks stay out of the shop and on the road.
Planning ahead?
Schedule a repair, PM, or inspection
Need a DOT inspection, a PM, winter prep, or a repair on a truck that’s parked in the yard? Send a request and dispatch will call you back to set it up.
Truck down right now? Don’t wait on a form — call (865) 500-4283.