Accurate Mobile Diesel Diagnostics & Truck Repair in Charleston, SC

Lowcountry Diagnostics helps commercial fleets and truck owners reduce downtime with accurate troubleshooting, on-site preventive maintenance, clear repair direction, and heavy-duty truck service across the Charleston area.

Call (843) 310-0995 Text Us Request Service

Charleston Mobile Light, Medium, and Heavy-Duty Truck Repair: 24/7 On-Site Service

Who we serve

Commercial and work-truck diesel across the Charleston tri-county, not consumer car repair.

Small fleets (2–10 trucks)

Keep revenue trucks running with on-site service.

Landscapers & contractors

Work trucks and diesel pickups that have to be on the job.

Delivery & service trucks

Box trucks, vans, and service-body units.

Owner-operators

One-truck operations that can't afford downtime.

Diesel equipment owners

Jobsite equipment and standby generators.

Reviews & Social

Google reviews & Facebook updates

Customer feedback and recent posts from Lowcountry Diagnostics.

Read our Google reviews

Rated 5.0 on Google

“He stayed on top of troubleshooting and never stopped until everything was fixed.”

Rebecca B., September 2026

“Joseph and team are top-notch! One of my fleet trucks went down and within the hour they had us back up and operational.”

Korey M., June 2026

Lowcountry Diagnostics

How We Work

Clear diagnostics. Clear communication. A repair direction you can act on.

Review the reported issue

Verify the fault

Test before replacing parts

Explain findings clearly

Recommend the next step

Document follow-up items

View Services Fleet Repair & Maintenance

What We Do

Our Services

For owner-operators, small commercial fleets, contractors, delivery trucks, service trucks, and local businesses that need reliable heavy-duty support where the truck is sitting.

Mobile Diesel Diagnostics & Repair

On-site diagnostics and repair for commercial trucks and diesel equipment.

Aftertreatment / DPF / DEF Diagnostics

DPF, DEF, SCR, NOx, regen, and derate troubleshooting.

Fleet Repair & Maintenance

On-site fleet repair, preventive maintenance, and support plans for local fleets.

24 Hour Roadside Truck Repair

Practical roadside support when the truck cannot wait.

Electrical & No-Start Diagnostics

Wiring, batteries, charging, starting, ECM and sensor diagnostics.

Construction & Generator Equipment

Diesel-powered jobsite equipment and generator support.

Based in Goose Creek, Serving the Charleston Area

Heavy truck repair that comes to the truck

Some repairs belong in a shop. A lot of diagnostics do not. We can meet you at the yard, terminal, roadside location, or job site and help determine whether the truck can be repaired on-site or needs a deeper repair plan.

Call Us Now

Why customers call us

Testing before parts replacement
Service at the yard, job site, roadside, or customer location
DPF, DEF, SCR, NOx, electrical, no-start, and derate troubleshooting
Clear repair direction before parts get thrown at it

Service Areas

Charleston
North Charleston
Mount Pleasant
Summerville
Goose Creek
Hanahan
Ladson
Moncks Corner

See our local pages for truck repair in North Charleston and a mobile diesel mechanic in Summerville, plus Mount Pleasant and Goose Creek.

Need service now?

Call or text Lowcountry Diagnostics for mobile commercial truck repair in the Charleston area.

(843) 310-0995
Joseph@lowcountrydiag.com

Recent Repair Photos

A look at the repairs we make

Scroll through real field photos from Lowcountry Diagnostics. From A/C repairs and electrical work to hydraulic, liftgate, and heavy-duty truck service, this is a snapshot of the work we handle.