Freightliner Truck Repair in Charleston, SC
Mobile diagnostics and repair for Freightliner Cascadia, M2 106/112, and medium-duty trucks — Detroit Diesel, Cummins, and aftertreatment service throughout the Charleston area.
Freightliner Service
The most common commercial truck on the road
Freightliner is the best-selling heavy-duty truck brand in North America, which means more of them are running through Charleston than any other make. Lowcountry Diagnostics provides mobile Freightliner service that comes to your yard, terminal, or roadside breakdown — no shop appointment required.
Models We Service
Cascadia, M2 106/112, Business Class, and Sprinter
We service the full range of Freightliner commercial trucks in operation across the Charleston area. This includes Cascadia day cab and sleeper configurations used in regional and OTR hauling, M2 106 and M2 112 medium-duty trucks used in vocational, utility, and delivery applications, and older Business Class M2 units still in active fleet service. Freightliner Sprinter vans (badge-engineered Mercedes-Benz Sprinter) are also within our scope.
Engine options we work on include the Detroit Diesel DD13, DD15, and DD16 found in Cascadia trucks, Cummins ISX, X15, and ISB engines in Freightliner applications, and older Series 60 Detroit Diesel engines in legacy fleet units. Each engine has its own aftertreatment configuration and common fault patterns that benefit from accurate diagnosis.
Common Repairs
What we see most often on Freightliner trucks
Detroit Diesel Aftertreatment
DD13, DD15, and DD16 engines use DEF-based SCR systems with DPF and DOC. SCR efficiency faults, DEF dosing issues, NOx sensor codes, and DPF soot/ash load faults are the most common aftertreatment calls on newer Cascadia trucks.
EGR System Faults
EGR valve and EGR cooler failures are common on Detroit Diesel and Cummins engines in Freightliner applications. EGR-related fault codes require careful diagnosis — many misdiagnoses result in replacing the EGR valve when the cooler is the actual source of the fault.
Electrical & Communication
Freightliner trucks use Cascadia's proprietary electrical architecture with multiple interconnected modules. Communication faults, body controller issues, switch panel problems, and chassis wiring faults require systematic diagnosis with proper software access.
Air System & Brakes
Air dryer failures, brake valve issues, air line leaks, and brake adjustment on Freightliner heavy-duty and medium-duty trucks are all within our service scope. Air system diagnosis and brake condition assessment can be done on-site.
No-Start & Fuel System
No-start conditions on Freightliner trucks can have multiple causes — fuel delivery faults, injection system issues, ECM communication problems, and air system faults. Systematic diagnosis identifies the actual fault before parts are ordered.
M2 Vocational Service
Freightliner M2 trucks in refuse, utility, construction, and delivery applications face demanding duty cycles. Electrical issues from body equipment, brake service, and engine diagnostics on M2 platforms are all part of our regular service calls in the Charleston area.
Mobile Freightliner service in the Charleston area
Freightliner trucks are a major part of the commercial vehicle population in the Lowcountry — from port-related freight haulers running I-26 and I-526 to M2 box trucks in last-mile delivery and utility trucks working throughout the metro area. When a Freightliner goes down, the logistics impact is immediate.
Lowcountry Diagnostics provides mobile Freightliner diagnostics and repair throughout Charleston, North Charleston, Summerville, Goose Creek, Mount Pleasant, and the surrounding area. We work with professional-grade diagnostic equipment for both Detroit Diesel and Cummins engine platforms, and we explain what we find before recommending a repair direction.
Clear Communication
Findings, options, and next steps you can act on
You should not have to guess what was checked, what failed, or what happens next. We explain the diagnostic findings, the likely cause, the recommended repair direction, and any follow-up items that should be watched or scheduled later.