James Mitchell
Diesel Diagnostics Writer
About James
James Mitchell is a diesel diagnostics writer with 15 years of hands-on heavy truck experience. He has spent his career diagnosing and repairing Class 8 commercial trucks across major US fleets, specializing in Cummins, Detroit Diesel, Volvo, PACCAR, and International engine platforms.
Throughout his career, James has worked from roadside fault-code triage to full engine overhauls, translating SAE standard terminology into plain-language guidance that drivers and mechanics can act on at the roadside. His focus is on explaining the why behind each code, not just the what.
Experience & Expertise
- 15 years of hands-on heavy truck engine diagnostics experience
- Specialist in SAE J1939 and SAE J1587 fault code protocols
- Hands-on experience across Cummins, Detroit Diesel, Volvo, PACCAR, International engine platforms
- Roadside triage practice — from SPN 1569 (STOP ENGINE) down to intermittent SCR system faults
- Translating OEM technical documentation into plain-language guidance for drivers and mechanics
Role at DTC Hub
James serves as the lead diagnostics writer and technical editor for DTC Hub. He writes and reviews fault code definitions and diagnostic procedures, ensures severity classifications reflect real-world roadside conditions, and translates SAE standard terminology into plain-language guidance that drivers and mechanics can act on at the roadside.
Editorial Approach
Fault code definitions on DTC Hub are derived from public SAE J1939/J1587 standards and publicly available OEM service documentation. James writes each diagnostic guide based on hands-on experience with heavy-duty engines; safety-critical information should always be verified against the manufacturer's official service literature before performing any repair.