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J1939 Network Communication Error
The ECM has lost communication with other modules on the J1939 data network. This fault affects data exchange between ECM, transmission, instrument cluster, and other networked components.
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J1939 is a CAN bus communication protocol used in heavy equipment. It allows the ECM, display, transmission, and other modules to share data over a two-wire network.
Measure resistance across CAN-H and CAN-L with all modules connected. Should read approximately 60 ohms (two 120 ohm resistors in parallel). 120 ohms indicates one missing terminator.
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