Heavy Truck Diesel Repair in Concord, NC

We handle the full spectrum of heavy-duty diesel work — if it has a diesel engine and it's between Class 6 and Class 8, we've got you covered. That means engine diagnostics with OEM-level scan tools, fuel system work from pressure testing to complete injector replacement, turbocharger repair and replacement, electrical system diagnostics (CAN bus, multiplexed controls, the whole nine yards), cooling system service, transmission and clutch work, full drivetrain service, and the complete aftertreatment system including DPF cleaning, DEF repair, EGR service, and SCR inspection. For fleets, we offer structured preventive maintenance programs built around your truck's duty cycle and OEM intervals — that's where the real money gets saved. Call us at (704) 786-0132 to discuss what your fleet needs.

I've been turning wrenches on diesel engines for over 30 years, and we work on all the major commercial platforms. That's Cummins in all its flavors — ISX, ISB, ISL, X15, B6.7 — Detroit Diesel from the old Series 60 through the modern DD13, DD15, and DD16, Caterpillar's C-series (C12, C13, C15), PACCAR's MX engines, International/Navistar platforms, and everything else running common-rail injection in a Kenworth, Peterbilt, Freightliner, International, Volvo, Mack, or Western Star frame. My guys know how each one breathes, where it likes to leak, and what its quirks are. We've got the factory service bulletins, the OEM software, and the diagnostic cables to prove it.

That depends entirely on what's broken and whether we're waiting on parts. A straightforward PM service with oil and filters can be done same-day if you get here early in the morning. Diagnostic work and mid-level repairs — like pulling and replacing injectors or servicing a turbo — typically run 1 to 3 days depending on how many questions the diagnostics raise. A major engine rebuild, a complete transmission overhaul, or any work that requires ordering OEM components can stretch to 3 to 7 business days, sometimes longer if parts have to come from across the country. The difference between us and a shop that guesses? We diagnose first, give you a real timeline, and keep you updated every step of the way. No surprises.

Yes. CTR offers structured preventive maintenance (PM) programs designed around your fleet’s size, duty cycle, and OEM-recommended service intervals. Fleet accounts receive priority scheduling, consolidated invoicing, and detailed digital service histories for every unit. Contact us at 704-786-0132 to discuss a custom PM program for your fleet.

Diesel repair costs vary significantly based on the type and severity of the repair. A standard PM service may start in the hundreds, while major engine work can run into the thousands. CTR provides a detailed diagnosis and transparent estimate before any work begins — you’ll always know the cost before we proceed. We don’t charge diagnostic fees that disappear if you approve the repair.

Common causes of diesel engine overheating include low coolant levels, failed thermostats, water pump failure, clogged or damaged radiators, failed charge air coolers, head gasket leaks, and restricted airflow to the radiator. Overheating should be addressed immediately — continued operation can cause warped heads, cracked blocks, and engine failure. CTR performs full cooling system diagnostics to identify and fix the root cause.

Absolutely. CTR uses OEM-level diagnostic scan tools and software to read and interpret fault codes from your truck’s ECM (engine control module). We go beyond just reading codes — we perform root-cause analysis including sensor testing, performance data review, and component inspection to ensure we fix the underlying problem, not just clear the code.

Yes. We service the full diesel aftertreatment system, including DPF (Diesel Particulate Filter) cleaning and replacement, DEF (Diesel Exhaust Fluid) system diagnostics and repair, EGR (Exhaust Gas Recirculation) valve and cooler service, and SCR (Selective Catalytic Reduction) system inspection. Properly functioning emissions components are essential for passing inspections, maintaining engine performance, and avoiding costly derate conditions.

CTR’s heavy-duty diesel repair shop is located at 2931 Armentrout Drive, Concord, NC 28025 — just off I-85 at Exit 58. We’re open Monday through Friday, 7:00 AM to 5:00 PM. We serve the entire Charlotte metro area including Concord, Kannapolis, Harrisburg, Charlotte, Huntersville, Mooresville, Salisbury, and surrounding communities.

Mobile repair works well for simple roadside issues, but complex diesel work — engine diagnostics, injector calibration, transmission repair, turbo rebuilds — requires a fully equipped shop environment with heavy-duty lifts, OEM-level diagnostic tools, and controlled conditions. CTR’s in-shop approach means more accurate diagnosis, higher-quality repairs, and longer-lasting results. We’ve been doing this since 1995 because our customers value getting it done right the first time.

For most issues, we can complete initial diagnosis within 1–3 hours and have results/recommendations for you same-day. Complex problems may require overnight analysis or follow-up testing. We prioritize getting you accurate diagnosis quickly because prolonged downtime costs you money. Call (704) 786-0132 when your diesel engine is acting up — we can often fit you in quickly and get you moving.

No. A check engine light indicates a real problem detected by the ECM — low oxygen sensor readings, emission system faults, fuel pressure issues, transmission problems, or emissions faults. Simply clearing the code without fixing the underlying problem results in the code returning, continued performance issues, and potential engine damage. Have the code diagnosed properly at CTR.

If your truck loses power or goes into derate, stop driving and call for roadside assistance. Common causes of sudden power loss: DEF system fault (triggering derate), DPF soot overload, turbocharger failure, fuel system problem, or ECM sensor failure. Do not attempt to diagnose this on the roadside — have it towed to CTR at 2931 Armentrout Dr (Exit 58 off I-85) for proper diagnosis.