Mobile Repair — MS · TN · AR

Mobile Semi Truck and Trailer Repair

Diesel Doc provides comprehensive on-site mobile repair for Class 7–8 semi-trucks, commercial tractors, and industrial trailers across North Mississippi, Greater Memphis, and Eastern Arkansas. Certified diesel technicians travel directly to fleet terminals, logistics yards, distribution docks, and job sites in fully stocked mobile service trucks to perform diagnostics, mechanical overhauls, electrical repairs, and trailer body repairs without shop towing.

CALL NOW FOR ON-SITE SERVICE  (901) 258-1528

All Mobile Services

Systems We Repair

What Truck & Trailer Systems Does Diesel Doc Service On-Site?

Engine Diagnostics & ECM Fault Management

Diesel Doc performs point-of-failure engine diagnostics utilizing OEM-level diagnostic software for Cummins, Detroit Diesel, PACCAR, Volvo, Mack, and International powerplants. Technicians connect directly via the J1939 diagnostic port to interrogate fault codes, troubleshoot active check engine lights, manage DPF soot loads, execute forced DPF regenerations, address DEF dosing faults, and clear derate countdowns on-site.

Air Brake Systems & Air Leak Diagnostics

Air brake repairs cover pressurized leak detection and full foundation brake repairs compliant with FMCSA standards. Mobile units stock Type 30/30 spring brake chambers, tractor protection valves, quick release valves, brass push-to-connect fittings, DOT-rated nylon air tubing, brake shoes, S-cams, and ABS wheel speed sensors to resolve primary and secondary system pressure drops.

Heavy-Duty Electrical & Starting Systems

Electrical services resolve starting failures, voltage drops, and trailer lighting communication losses. Technicians replace high-output 12V/24V alternators, heavy-duty starters, and commercial group 31 AGM battery banks on site. Diagnostic services trace broken wiring harnesses, corroded chassis grounds, melted fuse blocks, and failed 7-way trailer receptacle connectors.

Heavy-Duty Suspensions & Bushings

Suspension repairs restore ride height stability, tractor-trailer alignment, and road safety. Technicians service Hendrickson, Neway, and Reyco air and mechanical suspensions on location, replacing ruptured air springs (air bags), leveling valves, torque arms, transverse rods, leaf springs, U-bolts, and equalizers.

Drivetrain & Differential Systems

Drivetrain repairs address driveline vibrations, torque losses, and fluid contamination. On-site service covers differential pinion seal leaks, inter-axle differential lockouts, carrier bearings, universal joints (U-joints), half-shaft replacements, and wheel hub assemblies.

Exhaust, Aftertreatment & Fuel Delivery Systems

Fuel and exhaust services resolve fuel starvation, exhaust leaks, and emissions restrictions. Mobile mechanics service primary and secondary fuel filter heads, low-pressure lift pumps, fuel rail pressure sensors, cracked exhaust flex pipes, exhaust clamps, and DEF line heaters.

Mobile Welding, Cutting & Structural Fabrication

Field welding repairs structural steel and aluminum trailer components directly in yards or loading docks. Certified technicians carry on-board mobile welding rigs to reweld sheared suspension hangers, repair cracked fifth-wheel mounting plates, straighten bent ICC bumper bars, and reinforce landing gear mounting brackets.

Commercial Trailer Doors & Hydraulic Lift Gates

Trailer entry repairs resolve loading-dock lockouts caused by jammed doors or failed lift gates. Diesel Doc repairs Whiting and Todco overhead roll-up doors (including cables, rollers, and counterbalance springs), re-aligns trailer swing doors, replaces door hinges and seal gaskets, and repairs Waltco, Maxon, and Palfinger electric-over-hydraulic lift gates.

Scheduled repair or roadside emergency? Diesel Doc handles both for the same systems. A breakdown on the highway or at a dock goes through roadside dispatch, which brings a technician immediately. Emergency Roadside Assistance → Non-emergency repair, scheduled preventive maintenance, and DOT inspections run through the fleet maintenance program. Fleet PM & DOT Inspections →

What We Work On

What Types of Trucks and Trailers Does Diesel Doc Service?

Diesel Doc services all Class 7 and Class 8 commercial tractor configurations, medium-duty vocational trucks, and commercial cargo trailers.

Types of Trucks and Trailers Diesel Doc Services

Reefer trailers get cold-chain-specific diagnostics and repair through Diesel Doc’s dedicated reefer service. Reefer & Cold-Chain Repair →

Need Semi Truck or Trailer Repair? Call Now (901) 258-1528

Scheduled VS Rapid Service

Scheduled Yard Service vs. Emergency Roadside Dispatch: How It Works

Diesel Doc provides two distinct operating modes: scheduled fleet yard maintenance and rapid emergency roadside dispatch.

DIESEL DOC OPERATIONAL SERVICE DISPATCH

SCHEDULED YARD & TERMINAL SERVICE

  • Dispatched to terminals, yards, and warehouses during scheduled windows

  • Comprehensive system overhauls, preventative maintenance, and testing
  • Zero tow costs or terminal disruption
  • Coordinated via Fleet Maintenance Hub

24/7 EMERGENCY ROADSIDE DISPATCH

  • Dispatched to highway shoulders, weigh stations, ramps, truck stops, and docks
  • Immediate priority response to clear critical mechanical strandings
  • On-site repair to avoid towing fees
  • Dispatched instantly via Roadside Hub

When you need immediate breakdown clearance: Contact our 24/7 Emergency Roadside Assistance Service for priority interstate and dock dispatch.

When you need scheduled inspections and servicing: Schedule through our Fleet Preventive Maintenance & DOT Inspection Program for proactive yard care.

WHERE WE WORK

Where Does Diesel Doc Provide Mobile Semi-Truck & Trailer Repair?

Diesel Doc deploys mobile service units across the central tri-state freight network, servicing North Mississippi, Greater Memphis, and Eastern Arkansas

Repair coverage across the tri-state.

North Mississippi Corridor

Providing mobile service along the Interstate 55 and Interstate 22/US-78 freight corridors. Service covers distribution terminals, logistics yards, and industrial parks in Southaven, Horn Lake, Walls, Hernando, Olive Branch, Coldwater, Senatobia, Holly Springs, Potts Camp, Oxford, New Albany, and Batesville across DeSoto, Marshall, Tate, Tunica, Panola, Lafayette, and Union counties.

Greater Memphis Logistics Hub

Covering the Mid-South freight gateway along Interstate 40, Interstate 55, the Interstate 240 bypass, Interstate 269 logistics ring, and the Lamar Avenue (US-78) industrial corridor. On-site repairs are deployed across Memphis, Bartlett, Germantown, Collierville, Arlington, and Oakland within Shelby, Tipton, and Fayette counties.

West Memphis & Eastern Arkansas Gateway

Serving terminal and logistics facilities west of the Mississippi River crossings along Interstate 40, Interstate 55, and the Interstate 555 spur. Deployments reach West Memphis, Marion, and Jonesboro across Crittenden and Craighead counties.

Our Full Service Area ⇒

THE PROCESS

How the repair process works.

Diesel Doc executes an automated, five-stage roadside response process designed to move stranded assets from breakdown to full operational clearance within hours.

.01

Call

.02

Tech Inroute

.03

Troubleshoot

.04

Repair

.05

Back On The Road

WHY DIESEL DOC

Why Diesel Doc for Mobile Truck & Trailer Repair?

Diesel Doc combines heavy-duty shop capabilities with the convenience and speed of mobile dispatch, reducing repair costs and fleet asset downtime.

Elimination of Towing Fees & Yard Staging

By bringing certified mechanics directly to your facility or staging lot, you avoid $800–$2,500 heavy-wrecker towing charges per unit.

First-Time Fix Inventory

Mobile units are custom-outfitted with diagnostic equipment, pneumatic lines, fittings, electrical components, and hardware to complete repairs on the initial visit.

Transparent Upfront Estimates

All repair work, whether single-unit emergency diagnostics or multi-trailer yard overhauls, receives an upfront estimate detailing parts and labor prior to initiation.

Equal Support for Independents and Fleets

We provide the same transparent pricing, rapid dispatch, and detailed mechanical work orders to independent owner-operators as we do to national carriers.

Our Certifications

  • DOT Certified

  • ASE Medium-Heavy Truck Certifications (Series T)

  • OEM Certification

  • EPA Certification

Answers

Frequently Asked Questions

Diesel Doc repairs electronic ECM systems, air brakes, suspensions, high-output electrical systems, drivetrains, hydraulic pumps, exhaust/aftertreatment components, trailer doors, and structural frame brackets on location.

Yes. Technicians deploy directly to carrier terminals, logistics hubs, drop lots, and job sites across MS, TN, and AR with fully self-contained mobile workshops.

Technicians conduct pressure-drop diagnostics, replace punctured DOT nylon airlines, swap leaking gladhands or tractor protection valves, replace cracked brake chambers, and adjust or replace automatic slack adjusters to restore air pressure and safety.

Yes. Diesel Doc repairs broken overhead cables, rollers, tracks, counterbalanced springs, bent lock rods, and broken hinges on Whiting, Todco, and swing-door trailer setups.

Mobile units use OEM diagnostic software for Cummins, Detroit, PACCAR, Volvo, Mack, and International engines to identify fault codes, command forced DPF regenerations, evaluate SCR efficiency, and reset derate timers.

Yes. Mechanics repair hydraulic pumps, relief valves, high-pressure lines, electrical control switches, and lifting cylinders on Maxon, Waltco, and Palfinger lift gates.

Yes. Mobile units carry on-board welders to repair cracked leaf spring hangers, bent crossmembers, ICC safety bumpers, fifth-wheel plates, and landing gear mountings.

Diesel Doc repairs dry van, flatbed, step deck, lowboy, tanker, dump, and refrigerated trailers. Cold-chain and refrigeration issues are supported through our dedicated Reefer & Cold-Chain Repair Service.

Scheduled mobile repair takes place at your yard, terminal, or customer dock to correct mechanical defects, deferred maintenance, or component wear. Roadside assistance provides emergency priority dispatch when a truck breaks down on a public highway or shoulder.

Yes. Comprehensive 90-day/annual FMCSA DOT safety inspections and scheduled fleet PM packages are executed on location through our Fleet Preventive Maintenance & DOT Inspections Division.

Yes. We serve single-truck owner-operators with the same rapid mobile dispatch, upfront pricing, and professional documentation provided to large commercial fleets.

Pricing is based on clear, standardized labor rates plus the required replacement parts. An upfront estimate is provided before mechanical work begins, ensuring zero unexpected fees on the final invoice.

Broken down right now?

Call dispatch. A technician will be routed to your exact location.