The ECM then generates and stores a diagnostic trouble code (DTC) in its memory. What do these codes mean and why should you care? Understanding how your vehicle works, especially the DTCs that ...

The aftertreatment system within a heavy-duty vehicle reduces the engine’s harmful emissions by cleaning the exhaust gases.

Mack and Allison Transmission integrate DTC data into GuardDog Connect, improving service support with rollout starting in late Q2 2025.