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 Liftgate Repair
Liftgate Repair in Charleston, SC — We Come to the Truck.
When a liftgate won't raise or lower, the truck can't run its route. We come to your yard, dock, or jobsite, test the hydraulic and electrical side of the gate, and repair the cylinder, pump, motor, solenoid, switch, or wiring that failed — so your delivery unit gets back to work.
- Hydraulic cylinders, pumps, motors, solenoids, switches, and wiring
- Won't-raise, won't-lower, slow, and dead-gate faults diagnosed on-site
- Serving Charleston, North Charleston, Summerville, Goose Creek, Mount Pleasant
What We Repair
The liftgate parts that leave you stranded
Hydraulic cylinders & fluid
Leaking or worn lift and tilt cylinders, blown seals, low or contaminated fluid, and hoses that let the gate drift or sag.
Pump & motor
Dead or weak pump motors, worn pump units, and low-power symptoms that make the gate slow to raise or fail to lift a load.
Solenoids & valves
Failed start and function solenoids and control valves that leave the gate working one direction but not the other.
Switches & wiring
Bad toggle and control switches, corroded connectors, broken wiring, weak grounds, and battery or power-feed problems.
Why Call Us
A dead liftgate is a dead route
A liftgate that won't cycle means the driver can't load or unload, and the whole run stalls. Towing a box truck to a shop for a gate problem is slow and expensive, and most liftgate faults are electrical or hydraulic issues that can be traced and fixed right at the truck.
Lowcountry Diagnostics tests the up and down circuits, checks the pump, motor, solenoids, and hydraulic pressure, and finds the actual failure instead of throwing a whole gate assembly at it. You get a clear answer and, in most cases, a repair on the same visit.
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 We Work
What happens when you call
1. Tell us the symptom
Won't raise, won't lower, slow, dead, or blowing fuses — plus the gate brand and truck — points us to the right first tests.
2. We come to the gate
Yard, dock, jobsite, or terminal across the Charleston area — no need to move a truck that can't work anyway.
3. Test hydraulic & electrical
We check power and grounds, switches, solenoids, pump and motor, and hydraulic pressure to isolate the real fault.
4. Repair on-site
Cylinders, seals, solenoids, switches, wiring, and motors are repaired or replaced where the truck is parked when practical.
5. Cycle-test the gate
We run the gate through full up and down cycles under load conditions to confirm it works before we leave.
6. Keep the route moving
Fleets get priority scheduling so a single dead gate doesn't take a delivery unit out for days.
Need liftgate repair in the Charleston area?
Call or text Lowcountry Diagnostics and we will come to the truck.
Common liftgate repair questions
My liftgate won't raise or lower — can you fix it on-site?
Usually. We diagnose the cause where the truck is parked — a dead motor, weak pump, failed solenoid, bad switch, low or leaking hydraulic fluid, or a wiring and power problem — and repair most liftgate faults on location.
What liftgate parts do you repair?
Hydraulic cylinders and seals, pumps and motors, solenoids, control switches and toggles, wiring and connectors, batteries and power feeds, and worn mechanical components on rail, tuck-under, and cantilever gates.
Why does my liftgate go up but not down, or down but not up?
One-direction problems usually point to a specific solenoid, switch, or valve for that function, or a hydraulic issue. We test the up and down circuits separately to isolate the failed part instead of guessing.
Do you work on liftgates for box trucks and trailers?
Yes. We service liftgates on box trucks, straight trucks, and trailers across common brands, including rail, tuck-under, cantilever, and slider-style gates, throughout the Charleston area.
Request Liftgate Repair
Tell us what the gate is doing and where the truck is parked. For a route that's stuck, calling or texting is fastest.
Route held up 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.
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