If you spend enough time working with heavy-duty vehicles, agricultural equipment, construction machinery, or industrial engines, you will eventually encounter proprietary J1939 messages. At that point, many engineers ask the same question: Can I reverse engineer a J1939 network? The short answer is yes—but only to a certain extent. Before…
Posts tagged as “proprietary CAN messages”
SAE J1939 defines a comprehensive framework for message formatting, transport, and network behavior in heavy-duty vehicle systems. While many Parameter Group Numbers (PGNs) are publicly standardized, a substantial portion of real-world J1939 traffic consists of proprietary messages. These messages are intentionally undocumented by OEMs and are often central to machine…
