Kubota
Kubota Standby Generators Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E01
Generator will not start, control panel shows E01 and immediately shuts down after crank attempt.
Low Oil Pressure Shutdown
E02
Kubota standby generator cranks but shuts down within a few seconds, displaying E02 on the controller.
High Coolant Temperature Shutdown
E03
Generator attempts to start but stops with E03 displayed, engine speed surges briefly before shutdown.
Overspeed Shutdown
E04
Kubota standby generator shuts down during run and displays E04, will restart but trips again after a short period.
Underspeed / Underfrequency Shutdown
E05
Generator controller shows E05 and prevents start, or shuts down shortly after start with no AC output.
Low AC Output Voltage / Under-voltage Protection
E06
Kubota generator shuts down and displays E06 after running under load for some time.
Overcurrent / Overload Trip
E07
Controller shows E07 and the generator will not crank when a start command is given.
Battery Voltage Low / DC Undervoltage
E08
Kubota standby generator displays E08 and stops cranking after a few attempts.
Crank Failure / Start Timeout
E09
Generator shuts down shortly after start with E09, engine runs roughly and may emit white smoke.
Fuel System Air Lock / Low Fuel Pressure
E10
Kubota controller shows E10 and the generator shuts down, often accompanied by black exhaust smoke under load.
Overfuel / Excessive Black Smoke Detected (Engine Overload or Injection Fault)
E11
Generator controller displays E11 and prevents start; engine compartment appears unusually hot after previous run.
Engine Compartment High Temperature Alarm
E12
Kubota standby generator shows E12 and will not start; fuel tank level appears low or empty.
Low Fuel Level Shutdown / Fuel Level Alarm
E13
Generator shuts down with E13; controller log indicates 'Emergency Stop Active'.
Emergency Stop Circuit Activated
E14
Kubota controller displays E14 and the generator will not accept load from the automatic transfer switch.
Generator-Utility Synchronization / Transfer Inhibit Fault
E15
Generator controller shows E15 and logs 'CAN Communication Error' or 'Controller Communication Fault'.
Controller Communication Bus Failure
E16
Kubota standby generator displays E16 and shuts down; controller log indicates 'Sensor Supply Fault' or 'Analog Input Error'.
5V/8V Sensor Supply Circuit Failure
E17
Generator controller shows E17 and prevents start; log indicates 'Glow Plug Circuit Fault'.
Glow Plug Circuit Open or Short
E18
Kubota generator shuts down with E18; controller indicates 'Oil Temperature High' or 'Engine Oil Overheat'.
High Engine Oil Temperature
E19
Generator controller displays E19 and logs 'Coolant Level Low' or 'Coolant Level Switch Open'.
Low Coolant Level Switch Activation
E20
Kubota standby generator shows E20 and will not start; log indicates 'Intake Air Heater Fault' on some cold-climate models.
Intake Air Heater Circuit Fault
Symptom
Generator controller display is blank or unreadable, but the engine may still run or attempt to start.
Controller Display Failure / Power Issue
Symptom
Generator emits heavy black smoke under load and seems to struggle to maintain speed, but no fault code is triggered.
Black Exhaust Smoke Under Load
Symptom
Generator enclosure interior shows signs of soot, and there is a strong exhaust smell inside the housing during operation.
Exhaust Leak Inside Enclosure
Symptom
Generator enclosure shows signs of water ingress, rust, or moisture around electrical components.
Water Ingress / Moisture Damage
Symptom
Generator is leaking engine oil onto the base frame or ground; no error code is present yet.
External Engine Oil Leak
Symptom
Generator produces a loud knocking or metallic tapping noise from the engine area during operation.
Engine Knocking / Internal Mechanical Noise
Symptom
Generator starts and runs but produces no AC power at the output terminals; controller shows normal run status with no codes.
No AC Output / Loss of Excitation
Symptom
Generator starts and runs but the building experiences lights flickering and unstable voltage during load changes.
Unstable Voltage / Poor Voltage Regulation
Symptom
Kubota generator emits a strong diesel fuel smell around the unit, sometimes with visible wet spots on lines or components.
External Fuel Leak
Symptom
Kubota generator produces excessive white smoke from the exhaust during startup and initial running.
White Exhaust Smoke on Cold Start
Symptom
Kubota generator runs but coolant temperature remains abnormally low, causing wet stacking and unburned fuel in the exhaust.
Engine Running Too Cool
Symptom
Kubota generator runs but frequently trips its main breaker when large motors or compressors start.
Nuisance Breaker Tripping on Motor Start
Symptom
Kubota standby generator battery repeatedly goes dead between exercise runs, even though the charger is connected.
Chronic Battery Discharge / Charging System Issue
Symptom
Kubota standby generator cranks normally but will not start; no error code is displayed on the controller.
No-Start Condition Without Fault Code
Symptom
Kubota standby generator is leaking coolant under the unit or around the radiator area during or after operation.
External Coolant Leak
Symptom
Kubota standby generator vibrates excessively during operation, causing rattling noises from the enclosure.
Excessive Vibration
Symptom
Kubota standby generator will not switch to AUTO mode or does not start automatically during a power outage, but starts manually.
Failure to Auto-Start on Utility Loss
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Generator will not start, control panel shows E01 and immediately shuts down after crank attempt.
|
Low Oil Pressure Shutdown | View Details |
| E02 |
Kubota standby generator cranks but shuts down within a few seconds, displaying E02 on the controller.
|
High Coolant Temperature Shutdown | View Details |
| E03 |
Generator attempts to start but stops with E03 displayed, engine speed surges briefly before shutdown.
|
Overspeed Shutdown | View Details |
| E04 |
Kubota standby generator shuts down during run and displays E04, will restart but trips again after a short period.
|
Underspeed / Underfrequency Shutdown | View Details |
| E05 |
Generator controller shows E05 and prevents start, or shuts down shortly after start with no AC output.
|
Low AC Output Voltage / Under-voltage Protection | View Details |
| E06 |
Kubota generator shuts down and displays E06 after running under load for some time.
|
Overcurrent / Overload Trip | View Details |
| E07 |
Controller shows E07 and the generator will not crank when a start command is given.
|
Battery Voltage Low / DC Undervoltage | View Details |
| E08 |
Kubota standby generator displays E08 and stops cranking after a few attempts.
|
Crank Failure / Start Timeout | View Details |
| E09 |
Generator shuts down shortly after start with E09, engine runs roughly and may emit white smoke.
|
Fuel System Air Lock / Low Fuel Pressure | View Details |
| E10 |
Kubota controller shows E10 and the generator shuts down, often accompanied by black exhaust smoke under load.
|
Overfuel / Excessive Black Smoke Detected (Engine Overload or Injection Fault) | View Details |
| E11 |
Generator controller displays E11 and prevents start; engine compartment appears unusually hot after previous run.
|
Engine Compartment High Temperature Alarm | View Details |
| E12 |
Kubota standby generator shows E12 and will not start; fuel tank level appears low or empty.
|
Low Fuel Level Shutdown / Fuel Level Alarm | View Details |
| E13 |
Generator shuts down with E13; controller log indicates 'Emergency Stop Active'.
|
Emergency Stop Circuit Activated | View Details |
| E14 |
Kubota controller displays E14 and the generator will not accept load from the automatic transfer switch.
|
Generator-Utility Synchronization / Transfer Inhibit Fault | View Details |
| E15 |
Generator controller shows E15 and logs 'CAN Communication Error' or 'Controller Communication Fault'.
|
Controller Communication Bus Failure | View Details |
| E16 |
Kubota standby generator displays E16 and shuts down; controller log indicates 'Sensor Supply Fault' or 'Analog Input Error'.
|
5V/8V Sensor Supply Circuit Failure | View Details |
| E17 |
Generator controller shows E17 and prevents start; log indicates 'Glow Plug Circuit Fault'.
|
Glow Plug Circuit Open or Short | View Details |
| E18 |
Kubota generator shuts down with E18; controller indicates 'Oil Temperature High' or 'Engine Oil Overheat'.
|
High Engine Oil Temperature | View Details |
| E19 |
Generator controller displays E19 and logs 'Coolant Level Low' or 'Coolant Level Switch Open'.
|
Low Coolant Level Switch Activation | View Details |
| E20 |
Kubota standby generator shows E20 and will not start; log indicates 'Intake Air Heater Fault' on some cold-climate models.
|
Intake Air Heater Circuit Fault | View Details |
| – |
Generator controller display is blank or unreadable, but the engine may still run or attempt to start.
|
Controller Display Failure / Power Issue | View Details |
| – |
Generator emits heavy black smoke under load and seems to struggle to maintain speed, but no fault code is triggered.
|
Black Exhaust Smoke Under Load | View Details |
| – |
Generator enclosure interior shows signs of soot, and there is a strong exhaust smell inside the housing during operation.
|
Exhaust Leak Inside Enclosure | View Details |
| – |
Generator enclosure shows signs of water ingress, rust, or moisture around electrical components.
|
Water Ingress / Moisture Damage | View Details |
| – |
Generator is leaking engine oil onto the base frame or ground; no error code is present yet.
|
External Engine Oil Leak | View Details |
| – |
Generator produces a loud knocking or metallic tapping noise from the engine area during operation.
|
Engine Knocking / Internal Mechanical Noise | View Details |
| – |
Generator starts and runs but produces no AC power at the output terminals; controller shows normal run status with no codes.
|
No AC Output / Loss of Excitation | View Details |
| – |
Generator starts and runs but the building experiences lights flickering and unstable voltage during load changes.
|
Unstable Voltage / Poor Voltage Regulation | View Details |
| – |
Kubota generator emits a strong diesel fuel smell around the unit, sometimes with visible wet spots on lines or components.
|
External Fuel Leak | View Details |
| – |
Kubota generator produces excessive white smoke from the exhaust during startup and initial running.
|
White Exhaust Smoke on Cold Start | View Details |
| – |
Kubota generator runs but coolant temperature remains abnormally low, causing wet stacking and unburned fuel in the exhaust.
|
Engine Running Too Cool | View Details |
| – |
Kubota generator runs but frequently trips its main breaker when large motors or compressors start.
|
Nuisance Breaker Tripping on Motor Start | View Details |
| – |
Kubota standby generator battery repeatedly goes dead between exercise runs, even though the charger is connected.
|
Chronic Battery Discharge / Charging System Issue | View Details |
| – |
Kubota standby generator cranks normally but will not start; no error code is displayed on the controller.
|
No-Start Condition Without Fault Code | View Details |
| – |
Kubota standby generator is leaking coolant under the unit or around the radiator area during or after operation.
|
External Coolant Leak | View Details |
| – |
Kubota standby generator vibrates excessively during operation, causing rattling noises from the enclosure.
|
Excessive Vibration | View Details |
| – |
Kubota standby generator will not switch to AUTO mode or does not start automatically during a power outage, but starts manually.
|
Failure to Auto-Start on Utility Loss | View Details |
No matching codes found
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