24/7
Southern Mobile Diesel Services
Mobile Truck & Fleet Repair in San Antonio, TX
On-Site. On Time. Ready to Work. We bring professional heavy-duty diesel repair directly to your yard, terminal, warehouse, or roadside location.
Southern Mobile Diesel Services is a San Antonio-based mobile truck repair company built around one objective: keeping commercial trucks and fleets moving. When a truck goes down, the cost goes far beyond the repair itself—drivers lose time, deliveries are delayed, and revenue-producing equipment sits idle.
We bring diagnostics, maintenance, and repairs directly to your equipment—whether at a terminal, warehouse, yard, job site, or down on the road—eliminating unnecessary shop visits and reducing downtime.
| Service Area: | San Antonio & South Texas |
| Base Location: | 12034 Donop Rd, San Antonio, TX |
| Availability: | 24/7 Emergency & Scheduled PM |
| Our Promise: | On-Site. On Time. Ready to Work. |
On-site troubleshooting and heavy-duty repair for commercial trucks, helping eliminate unnecessary towing and trips to a repair shop.
Request ServiceBrake, suspension, air-system, electrical, lighting, and general mechanical repairs for commercial tractors and trailers.
Request ServiceScheduled oil and filter services, inspections, fluid checks, lubrication, and PM programs designed around your fleet operating schedules.
Request ServiceOn-site tire replacement, mounting and dismounting, flat repair, inspection, and disposal. New commercial tires available as needed.
Request ServiceFast mobile response for unexpected breakdowns and repairable mechanical problems right where your equipment is located.
Request ServiceAdvanced computer diagnostics, fault-code evaluation, aftertreatment troubleshooting, and on-site forced regeneration services.
Request ServiceFrom computer diagnostics and forced regens to preventive maintenance, tires, brakes, electrical, suspension, and trailer repairs—use one reliable provider for multiple fleet needs.
Our mobile diagnostic capability identifies engine, emissions, electrical, and aftertreatment problems right at the truck rather than automatically sending equipment to a repair shop.
We come directly to your yard, terminal, warehouse, job site, or roadside location across San Antonio and South Texas, reducing unnecessary towing and shop visits.
Customers know the service structure upfront: service call, labor, mileage, diagnostics, and any other applicable charges are clearly defined before we begin work.
We understand that a commercial truck is a revenue-producing asset. Our objective is to diagnose the problem, determine the right repair, and return equipment to service fast.
Structured to support both single-truck owner-operators and multi-unit commercial fleets, including scheduled preventive maintenance and recurring fleet service.