All Engine Manufacturers
Browse 44 fault codes across 5 heavy-duty diesel engine brands.
🔧 The Engineering Behind Every Code — Every heavy-duty engine manufacturer approaches fault diagnostics differently. Cummins uses standard SAE J1939 codes plus an extensive proprietary library in INSITE. Detroit Diesel (DTNA) employs the Amplified Common Rail system with notoriously detailed fault codes. Volvo engineers its SCR system with a progressive fault cascade. PACCAR collaborates with Netherlands-based DAF Trucks for the MX-13 engine. International partnered with Germany's MAN for the parent-bore A26 engine design. Understanding the engineering philosophy behind each manufacturer helps you diagnose faults faster.