J1939
**J1939**
What is J1939?
SAE J1939 is a set of standards defined by the Society of Automotive Engineers (SAE) for a Controller Area Network (CAN) bus used for communication and diagnostics among vehicle components, specifically in heavy-duty vehicles such as trucks, buses, and construction equipment. It defines how control units communicate using a common language, enabling interoperability between different manufacturers' components like engines, transmissions, and braking systems. This allows for standardized diagnostics, control, and data exchange across the vehicle.
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