1985 Autocar — we work on any truck
If it runs diesel and needs help, we'll show up. Age is not a barrier — classic, vintage, or modern.
Mobile Fleet Preventive Maintenance
Fleet Maintenance in Charleston, SC — PM Done On-Site.
Lowcountry Diagnostics keeps your trucks running with scheduled preventive maintenance performed at your yard, terminal, or lot. We service units where they park, catch wear before it becomes a breakdown, and give you a written record for every truck — so downtime stays low and the fleet stays on the road.
- Scheduled on-site PM for trucks, vans, trailers, and equipment
- Fluids, filters, brakes, tires, batteries, and fault scans in one visit
- Charleston, North Charleston, Summerville, Goose Creek, Mount Pleasant
What We Service On-Site
One mobile tech for your whole PM program
Engine & fluids
Oil and filter changes, coolant, fuel filters, and DEF checks on the interval that fits your mileage and duty cycle.
Brakes & air system
Air brake inspection, slack adjusters, chambers, lines, and air leaks checked and adjusted where the truck sits.
Tires, wheel ends & chassis
Tire condition, tread, wheel ends, suspension, and steering looked over to catch problems before a roadside failure.
Electrical & fault scan
Batteries, charging, lights, and a scan for stored codes so aftertreatment and engine faults are caught early.
Why On-Site PM
Maintenance that fits around your routes
Every hour a truck spends in a shop line is an hour it is not earning. On-site preventive maintenance changes that. We come to your location and service units while they are idle — before a shift, between routes, or overnight — so the truck is ready when your driver is.
Consistent PM also means fewer surprises. Catching a worn brake, a weak battery, or an early fault code on a scheduled visit is far cheaper than a tow and a missed delivery. You get a written record for each unit and a clear picture of what needs attention next.
Why operators call us
- Mobile service where the truck is sitting
- Testing before parts replacement
- Clear written findings and next steps
- Commercial diesel and fleet-focused support
- 24/7 Charleston-area availability
How Fleet PM Works
What a maintenance program looks like
1. Tell us your fleet
Number of units, makes, engines, and how hard they run tells us the right intervals and service scope.
2. Set a schedule
We build PM intervals around your mileage and routes so units get serviced while they are parked and idle.
3. We come to you
Yard, terminal, or lot across the Charleston area — no need to shuttle trucks to a shop for routine service.
4. Full PM inspection
Fluids, filters, brakes, tires, batteries, lights, and a fault-code scan handled in one on-site visit per unit.
5. Written record per unit
Each truck gets documented findings and recommendations that support DOT compliance and planning.
6. Head off breakdowns
We flag wear before it strands a truck, so you replace parts on your schedule instead of on the roadside.
Ready to cut fleet downtime in Charleston?
Call or text Lowcountry Diagnostics to set up on-site preventive maintenance.
Common fleet maintenance questions
Do you perform fleet PM on-site?
Yes. We come to your yard, terminal, or lot and perform scheduled preventive maintenance where your trucks park, so units stay in service instead of sitting in a shop queue.
Can you service trucks after hours or on weekends?
Yes. We schedule PM around your routes, including nights and weekends, so maintenance happens while trucks are idle and available across the Charleston area.
What is included in a preventive maintenance service?
Typical PM covers oil and filters, fluid levels, brakes and air system, tires and wheel ends, batteries and charging, belts and hoses, lights, and a scan for stored fault codes with a written report.
Do you keep maintenance records for our fleet?
Yes. Each unit gets a written service record with findings and recommendations, which helps with DOT compliance and planning the next interval. Call or text (843) 310-0995.
Request a Fleet Maintenance Quote
Tell us about your fleet and where the trucks park. We will follow up to set up on-site PM. For urgent needs, calling or texting is fastest.
Truck down right now? Call or text (843) 310-0995.
Recent Repair Photos
A look at the repairs we make
Real field photos from Lowcountry Diagnostics — from engine diagnostics and electrical to hydraulic, HVAC, and heavy-duty truck service, handled on-site across the Charleston area.
Reviews