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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.
Send us the code or alarm and what the generator is doing, and one of our engineers will help you diagnose it.
Search other controller alarms and engine fault codes, with troubleshooting steps, in Generator Oracle.
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A fault code names a symptom, not a cause. Our engineers have written the diagnostic sequence they use on site for this class of fault — ranked causes, ordered steps with the reading expected at each one, and the point at which to stop and call someone.
8 diagnostic steps · intermediate · technician
8 diagnostic steps · intermediate · technician