Cumminsengine platform
Cummins powers more Class 8 trucks than any other engine, both as a factory option and a repower. We connect Cummins INSITE, pull fault codes, force parked regens, and clear SCR/DEF derates across the full Cummins lineup — from the 15L heavy-duty flagship down to the 6.7L medium-duty.
Cummins engines in service
The Cummins engine model numbers in production and in service across Class 5-8 commercial trucks over roughly the last 15 years. MTG diagnoses and services every one of these.
15L heavy-duty flagship (2017+); replaced the ISX15. Class 8 over-the-road.
Pre-2017 15L heavy-duty; the most common big-bore engine still in service.
12L heavy-duty (2017+); replaced the ISX12 for weight-sensitive fleets.
12L heavy-duty; widely in service in regional and vocational Class 8.
9L; replaced the ISL9. Class 6-8 vocational and regional haul.
9L; still in service across vocational and refuse Class 6-8.
6.7L; replaced the ISB6.7. Class 5-7 medium-duty and Ford F-650/F-750.
6.7L; still in service in Class 5-7 medium-duty trucks.
8.3L; older vocational Class 6-8, still in service.
Diagnostics, not guesswork
We connect the right brand-specific diagnostic software for Cummins, pull both active and inactive fault codes, and read live data — soot load, differential pressure, NOx readings, EGT, fuel pressure, charging voltage — before recommending a single part. From forced DPF regens and SCR/DEF derates to no-starts, cooling faults, and air system service, our techs handle it in the shop or on the shoulder.
MTG Shops does not perform Cummins engine overhauls or in-frame / out-of-frame rebuilds in-house. We have quality partners in every market who specialize in Cummins overhauls. We handle the diagnosis, get the truck to the right specialist, and coordinate the handoff so your downtime stays minimal.
Get a bay time and a straight estimate.