▸ DIESEL & HEAVY-DUTY SERVICE
Diesel & Heavy-Duty
diagnostic & programming.
Diesel and heavy-duty diagnostics is a strategic Spot-On specialty. Lead technician holds ASE Master Medium/Heavy Truck and ASE L2 Electronic Diesel Engine Diagnosis Specialist credentials. We program Cummins via INSITE/Power Spec/Calterm, Duramax via GDS2/TIS2000, and Powerstroke via FDRS — plus heavy-duty electrical diagnostics for fleets and shops across the San Antonio metro and mail-in nationwide.
▸ WHAT WE DO
Diesel & Heavy-Duty capabilities at Spot-On.
- CumminsINSITE for engine diagnostics, Power Spec for parameter changes, Calterm for engineering-tier work. ISB, ISL, ISX, B6.7 coverage.
- DuramaxGDS2 + Tech 2 + TIS2000. LB7 through L5P coverage.
- PowerstrokeFord FDRS with current OEM subscription. 6.0L, 6.4L, 6.7L, 7.3L Godzilla.
- DEF / SCR programmingDiesel exhaust fluid system reprogramming and emission system service.
- EGR adaptationsAdaptation procedures and system service post-replacement.
- Post-rebuild calibrationAfter engine rebuild or replacement — injector codes, fuel system learn, governor calibration.
- Detroit Diesel + AllisonHeavy commercial vehicle platforms. ASE Master Medium/Heavy Truck credentialed.
▸ FOR VEHICLE OWNERS
In-shop, by appointment
Drop-off at 4715 N Stahl Park, Suite 105, San Antonio. We do not dispatch mobile service to retail customers.
Book an appointment →▸ FOR TRADE PARTNERS
Mobile, remote, or mail-in
Mobile dispatch across the San Antonio metro. J2534 remote programming + mail-in bench service nationwide.
See trade services →▸ READY TO BOOK
Diesel & Heavy-Duty service starts here.
Call with the year, model, and what the vehicle is doing. Most diagnoses same-day.