Engine Diagnostics

Modern heavy-duty trucks are rolling computers. When a Check Engine Light or "Stop Engine" warning appears, you don't need a guess—you need a precise answer. At Expert Mechanic Services, we don't just use generic code readers. We utilize OEM-level diagnostic software compatible with all major heavy-duty platforms, including Cummins, Detroit Diesel, Volvo, Mack, Paccar, and International. We connect directly to your ECM to read active and inactive fault codes, view live data streams, and pinpoint exactly what is causing your derate or power loss. We identify the root cause instantly so we can fix it and get you back on schedule.