Cummins
Control Panel Power Loss
Controller display is blank or intermittent, generator otherwise appears intact
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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
Blown control fuse, Loose DC power connection to controller, Failed controller power supply, Internal controller fault
How to Fix / Troubleshooting
Safety first: Disable automatic start. Disconnect battery negative before removing the controller if required.
- Check fuses: Locate and test the low-voltage control fuses in the Cummins control panel. Replace any blown fuses with the correct rating.
- Power connections: Verify tightness of DC supply and ground wires at the controller terminals.
- Battery voltage: Confirm adequate battery voltage at the controller input.
- Controller replacement: If power and fuses are good but the display remains dead, the controller module may have failed and require replacement and configuration by a Cummins dealer.
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Repair Difficulty
Hard
4/5
Required Part
Generator Controller Module
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