Heavy Duty Diagnostics

PACCAR unveiled PACCAR Connect at ATA MCE: factory-integrated telematics, apps and fleet tools for Kenworth and Peterbilt Class 8 trucks, arriving early 2027.

TEXA IDC6 Truck 2026.20 updates 38 truck brands and 9 North America heavy duty brands, with Cummins, PACCAR EAS 4 and Detroit PowerShift 5 updates and 19 new wiring diagrams.

Cold mornings stop more diesels with gelled fuel and iced filters than with dead batteries. A pre-freeze checklist for diesel fuel, water separators, DEF and a pre-winter scan, built on fuel chemist and OEM guidance.

If you’ve recently gotten an email suggesting you’re about to lose support—and that the “only” solution is switching diagnostic brands—take a breath. You’re not the only shop being put in that position, and you’re not stuck. At DEFY DIAGNOSTICS, we’re keeping this...

What if your team could trigger a forced DPF regen from 500 miles away, and get the truck back on route before lunch? Fleets and off-highway operations live and die by uptime. A truck stuck in derate, a loader throwing intermittent DTCs, or a combine with a clogged...

“What happens if that radar up front is off by half a degree?” If you manage Class 7 or Class 8 trucks, that question is no longer hypothetical. Advanced Driver Assistance Systems (ADAS), forward collision warning, lane departure warning, adaptive cruise, blind spot...

New Free Resource: Downloadable Wiring Diagrams Now Available on DefyDiagnostics.com At Defy Diagnostics, we know how frustrating it can be when you’re chasing down an electrical fault, and you don’t have the right diagram in front of you. Whether you’re...

INTRODUCTION The 2025 Utility Expo in Louisville, Kentucky, is officially in the books, and what a week it was. From the moment the doors opened Tuesday morning to the last conversation Thursday afternoon, the energy was electric (even if the weather wasn’t). We spent...

Ever cleared a code, took a test drive, and watched that light pop right back on? You’re not alone. Most code lists explain what a DTC means, but not how to use it to make faster, cleaner, safer decisions. Techs and fleet managers need context: severity, first steps,...