# Mobile fleet and truck repair services Canonical HTML: https://volgramllc.com/services Markdown: https://volgramllc.com/services.md Every service Volgram LLC performs is delivered at the vehicle across Atlanta and Metro ATL. Quoted before dispatch. Invoiced in USD. ## 01 Electrical Systems Electrical faults are where fleets lose the most time, because the symptom and the cause are rarely in the same place. We trace circuits, read live module data and test under load before anything is replaced, so the repair is the one the truck actually needed. When a controller itself needs an update or a replacement flash, we program ECM, MCM, ACM and CPC modules to their required operating condition. - **Electrical systems repair** — Charging, starting, grounds and harness work. Alternators, starters, battery banks, cables, grounds, connectors and damaged harness sections. We repair the circuit rather than swapping the nearest component, and we test the result under load before the unit goes back into service. - **Computer diagnostics** — Live data, module and network testing. Full scan across engine, aftertreatment, transmission, brake and body controllers. We read live data and freeze-frame rather than a code list, and we check the J1939 network itself when modules stop reporting. - **ECM programming** — Engine control module flash, calibration and parameters. Factory-authorized engine control module calibration updates, replacement ECM programming after a module swap, and customer parameter configuration such as road speed, idle shutdown and PTO settings. All programming is performed in compliance with applicable U.S. law; we do not perform emissions defeat work. - **MCM programming** — Motor control module flash and replacement setup. Motor control module calibration updates and replacement MCM flashing after a module swap, including injector-control parameters on Detroit-platform engines. The work restores the engine to its required operating condition. All programming is performed in compliance with applicable U.S. law; we do not perform emissions defeat work. - **ACM programming** — Aftertreatment module calibration and replacement flash. Aftertreatment control module programming covering regen, DEF dosing, NOx and DPF-related parameters, plus replacement ACM setup after a module swap. The goal is a working emissions system that stays in regen and out of derate. All programming is performed in compliance with applicable U.S. law; we do not perform emissions defeat work. - **CPC programming** — Common powertrain controller parameters and replacement flash. Common powertrain controller programming on Freightliner and related chassis — replacement CPC setup, customer parameters such as road speed, idle shutdown and PTO, and powertrain-interface configuration. All programming is performed in compliance with applicable U.S. law; we do not perform emissions defeat work. - **Electrical diagnostics** — No-power, shorts, parasitic draw and grounds. Voltage-drop testing, parasitic draw isolation, short and open location, and intermittent fault tracing. This is the work that resolves the trucks that have already been to two other shops. - **Starting and charging systems** — Batteries, starters, alternators tested under load. Load testing of the whole starting and charging circuit, not just the battery. We identify whether a repeat no-start is a battery, a cable, a ground, a starter or a draw somewhere else in the vehicle. [Group page](https://volgramllc.com/services/electrical-systems.md) ## 02 Engine & Aftertreatment Aftertreatment problems are usually engine problems wearing a disguise. We diagnose the fuel, air and cooling side properly before touching the emissions hardware, which is what keeps the repair from coming back three weeks later. - **Engine repair** — In-frame and component-level diesel repair. Cylinder head work, valve adjustment, gaskets and seals, oil leaks, low power and excessive blow-by. We scope the job against the duty cycle and the remaining life of the unit before recommending it. - **DPF and emissions systems** — Regen faults, sensors, DEF and derate diagnosis. Incomplete regen, repeat derates, DEF quality and dosing faults, differential pressure and NOx sensor problems, and cleaning or replacement of restricted filters. All work restores the emissions system to its required operating condition. - **Fuel systems and injection** — Injectors, pumps, rails and return testing. Injector testing and replacement, high-pressure pump diagnosis, rail pressure faults, return-flow testing and contaminated fuel cleanup. Hard starting, rough running and low power usually resolve here. - **Cooling system repair and diesel flush** — Overheat diagnosis, radiators, flush service. Overheating diagnosis, radiator and charge air cooler service, water pump and thermostat replacement, fan clutch faults, and full diesel coolant flush with the correct specification coolant. - **Glow plug service** — Cold-start circuits, controllers and plugs. Glow plug, relay and controller testing and replacement, plus intake heater diagnosis. Addresses hard cold starting, rough warm-up and white smoke on start. - **Hard start and no start** — Systematic fuel, air, compression and electrical. A structured no-start diagnosis covering electrical supply, fuel delivery and pressure, air intake and compression, rather than replacing parts in sequence until it fires. - **Air system repair** — Compressors, dryers, valves and leak isolation. Air compressor and dryer service, governor and valve faults, air leak isolation, and low-pressure or slow-build complaints affecting brakes and suspension. [Group page](https://volgramllc.com/services/engine-aftertreatment.md) ## 03 Truck, Trailer & Reefer A tractor that runs is only half of a working unit. We cover the trailer and the refrigeration unit as well, so a single dispatch can put the whole combination back into service instead of scheduling three separate visits. - **Truck repair** — Class 6-8 tractor and straight truck service. Mechanical and electrical repair across medium and heavy-duty trucks, including brakes, suspension, steering, driveline and cab electrical. - **Trailer repair** — Lights, brakes, ABS, air lines and landing gear. Trailer lighting and wiring faults, brake and ABS work, air line repair, landing gear, door and hardware repair. The items that fail an inspection and hold a load at the gate. - **Reefer repair** — Thermo King and Carrier-type trailer units. Refrigeration unit diagnosis and repair covering start failures, temperature and setpoint faults, alarm codes, belts, and electrical problems on Thermo King and Carrier-type equipment. [Group page](https://volgramllc.com/services/truck-trailer-reefer.md) ## 04 Fleet Care Preventive work only pays if it actually happens. We run maintenance at your yard, on the units you nominate, at intervals that match how the trucks are used, and we report what we found so the next failure is not a surprise. - **Fleet maintenance programs** — Scheduled PM by unit, with written reports. Recurring preventive maintenance across your units with documented inspection results, so you can plan repairs around dispatch instead of reacting to breakdowns. - **Mobile maintenance** — Routine service performed at your yard. We bring the service to the vehicles. Routine maintenance runs while the units are parked between shifts rather than costing you a day of availability. - **Oil and filter service** — Full-service oil, filters and inspection. Oil and filter changes to specification with a full walk-around inspection, fluid checks and any developing issues flagged in the report. - **A/C services** — Diagnosis, recovery, recharge and repair. Air conditioning diagnosis, leak detection, recovery and recharge, compressor and control faults for cab and sleeper systems. - **Transmission service** — Manual and automated transmission work. Fluid service, clutch and shift complaints, control and sensor faults, and diagnosis on automated manual transmissions. - **Clean truck checks** — Emissions readiness and compliance inspection. Inspection of the emissions system and its readiness monitors, with a written summary of anything that would fail a compliance check and what it takes to correct it. - **DOT inspection prep** — Find the write-ups before the inspector does. A pre-inspection walkthrough covering the items most commonly cited, so violations get corrected in your yard rather than at a roadside scale. [Group page](https://volgramllc.com/services/fleet-care.md) ## 05 On-Site & Emergency Every service we offer is mobile. When a unit goes down on I-285 at two in the morning, the objective is to get it moving where it sits, and to tell you honestly when it needs to be towed instead. - **Mobile service** — We come to you — yard, jobsite or roadside. Our technicians arrive with diagnostic equipment and tooling. There is no queue for a bay and no waiting for a slot on Monday. - **24/7 roadside assistance** — Round-the-clock dispatch across Metro ATL. Emergency response at any hour across Atlanta and Metro ATL. Call and speak to someone who can tell you what is likely wrong and what will be on the truck when it arrives. - **Jump starts** — Get moving, then find out why it died. Emergency starting assistance, followed by testing of the batteries, cables and charging circuit so the same unit is not down again the next morning. - **Fuel delivery** — Diesel and DEF brought to the unit. Emergency diesel and DEF delivery, including priming and restart after a run-dry event. - **Emergency roadside repairs** — Get it rolling where it sits. On-scene repair of the fault that stopped the truck where it can be done safely and legally, with a clear call on when towing is the correct decision instead. [Group page](https://volgramllc.com/services/on-site-emergency.md)