New Hyde Park, NY • Heavy-Duty Truck Specialists
From mechanical repairs to advanced diagnostics, electrical troubleshooting and module programming, GCP handles the complete repair process under one roof — so your truck spends less time moving between vendors and more time on the road.
What GCP does
From mechanical repairs to advanced diagnostics and module programming, GCP handles the complete repair process under one roof.
Diesel engines, fuel systems, turbo and intake, cooling, brakes, suspension and preventive maintenance.
View truck repair → 02Computer diagnostics, no-start, loss of power, electrical faults, ABS, DPF/aftertreatment, fuel and sensor testing.
View diagnostics → 03Replacement-module programming, configuration, calibration and parameter setup for ECM, ECU, TCM, ACM and related modules.
View programming → 04Modules offline, intermittent communication, open/shorted circuits, backbone/termination faults and network-level troubleshooting.
View network repair → 05A single technical partner for recurring diagnostics, repair, programming and preventive service for commercial fleets.
View fleet services → 06Electronic and mechanical transmission diagnostics, module communication and programming support.
View transmissions →Platforms we commonly service
Independent repair facility. Brand names are used only to identify platforms we service; GCP Truck Repair Inc. is not affiliated with or endorsed by these manufacturers.
Our actual shop
These are real photos of GCP Truck Repair Inc. — our service bays, current heavy-duty repairs and advanced diagnostic work. Customers can see the actual facility, equipment and type of work behind our service.
Recent work • Real shop cases
Anonymized examples from real diagnostic and repair work. We focus on finding the cause, making the repair and verifying the system before the truck leaves.
Problem: Engine warnings and data-link communication dropping out intermittently.
Solution: Circuit-level network testing, communication wiring repair and verification that the required modules stayed online.
Problem: A replacement controller needed the correct vehicle configuration before returning to service.
Solution: Factory configuration, module programming and communication verification on the truck.
Problem: Heavy-duty truck losing power under load.
Solution: Pressure-tested the charge-air path, located the leaking intercooler connection and repaired the affected system.
Problem: A persistent coolant-level DTC remained after the tank and sensor had already been replaced.
Solution: ECM-pin testing, harness isolation and control-circuit verification to identify the fault instead of replacing more parts blindly.
Problem: High-soot or extended-regeneration complaints that keep a truck out of service.
Solution: Aftertreatment data review, sensor and system testing, regeneration/soot procedures and verification before recommending parts.
Problem: Transmission communication or electronic-control complaints requiring more than a mechanical inspection.
Solution: TCM/data-link diagnostics, electrical testing and programming support when required by the repair.
Why GCP
A truck can have a mechanical problem, an electrical problem and a communication problem at the same time. GCP is built to work across all three instead of guessing or replacing parts until the symptom disappears.
For owner-operators & fleets
Send the year, make, model, symptoms and fault codes. We can start with the information that matters before the truck arrives.
Request ServiceCommercial fleet support
Give your fleet one point of contact for mechanical repairs, electrical faults, module programming, communication-network problems and preventive service.
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Request service
Include the year, make, model, symptoms, fault codes and anything already replaced or tested. The more useful information we have, the faster we can prepare for the diagnosis.