SPN 3055 FMI 2
Volvo Penta
CAN Bus Communication Fault
Generator fails to take load; ECU logs CAN communication error with generator control module.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Open or shorted CAN wiring between ECU and genset controller, Incorrect CAN termination, Faulty generator control module, Electrical noise or grounding issues
How to Fix / Troubleshooting
Safety: Isolate AC output and disable auto-start before working on control wiring.
- Inspect CAN wiring: Locate the twisted pair CAN lines between the Volvo Penta ECU and the generator controller. Check for cuts, abrasions, or loose terminals.
- Verify termination: Ensure that 120 Ω termination resistors are installed at each end of the CAN bus as specified. Measure resistance across CAN-H and CAN-L with power off; it should be about 60 Ω.
- Check grounding: Confirm that ECU, controller, and engine frame share a solid common ground. Tighten ground lugs and remove corrosion.
- Reduce noise sources: Route CAN cables away from high-current AC cables and contactors. Replace damaged shielded cable with equivalent shielded twisted pair.
- Module testing: If wiring and termination are correct, one of the modules may be defective. Swap with a known-good controller if available or have modules tested by an authorized Volvo Penta service center.
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Repair Difficulty
Hard
4/5
Required Part
Generator Control Module
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