Fault Code 235
Cummins
Engine Control Module Low Voltage
Controller shows Fault Code 235 – ECM Power Supply Voltage Low; intermittent shutdowns or no start
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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
Loose ECM power or ground connections, Failing DC power relay, Weak battery or charger issues, Corroded harness connectors
How to Fix / Troubleshooting
Safety first: Disable automatic start. When working on control wiring, avoid static discharge and shorts.
- Check ECM power: Using the wiring diagram, locate the ECM power and ground pins. Verify proper voltage and continuity with a multimeter.
- Inspect grounds: Clean and tighten engine and frame ground points associated with the ECM.
- Relays and fuses: Check the ECM power relay and related fuses in the control panel. Replace any that are heat-damaged or intermittent.
- Harness inspection: Look for chafed or pinched wiring in the ECM harness. Repair or replace damaged sections.
- Reset: Clear the fault and test run the generator, monitoring for stable ECM voltage.
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Repair Difficulty
Hard
4/5
Required Part
Engine Control Module (ECM) Power Relay
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