SAE J1939-71 defines the Vehicle Application Layer, specifying the data definitions for heavy-duty vehicle ECUs, including PGNs for parameter groups and SPNs for individual signals. It functions at the OSI application layer to ensure interoperability, with modern definitions largely migrated to the J1939DA digital annex. For more details, visit SAE International .
You see a CAN ID of 0x0CF00400 .
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SAE J1939-71 standard is the "Vehicle Application Layer" of the J1939 network, serving as the primary reference for how heavy-duty vehicles—like trucks, buses, and tractors—talk to themselves. SAE International Think of it as the dictionary and rulebook You see a CAN ID of 0x0CF00400
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