Kohler-SDMO
Kohler-SDMO 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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AL01
The controller displays AL01 / Low Oil Pressure, and the generator shuts down shortly after starting.
Low Oil Pressure Shutdown
AL02
The controller displays AL02 / High Engine Temperature, and the generator shuts down during load.
Engine Overtemperature Shutdown
AL03
The controller shows AL03 / Overspeed, and the generator stops immediately after a start attempt.
Engine Overspeed Protection Trip
AL04
The controller displays AL04 / Underspeed, and the generator fails to reach rated frequency.
Engine Underspeed/Underfrequency Fault
AL05
The controller shows AL05 / Low Fuel Level and prevents automatic starting.
Low Fuel Level Alarm
AL06
The controller displays AL06 / Battery Voltage Low, and the generator will not crank.
Low DC Battery Voltage
AL07
The controller shows AL07 / Battery Voltage High while the generator is running or on standby.
High DC Battery Voltage
AL08
The controller displays AL08 / Emergency Stop, and the generator cannot start in AUTO mode.
Emergency Stop Circuit Active
AL09
Controller shows AL09 / Low Coolant Level and prevents automatic start.
Low Coolant Level Alarm
AL10
Controller displays AL10 / Oil Temperature High and the engine shuts down under load.
High Oil Temperature Shutdown
AL11
Controller displays AL11 / Preheating Fault and the engine is hard to start in cold weather.
Engine Preheater / Glow Plug Circuit Fault
AL12
Controller displays AL12 / Start Failure after several crank attempts; the engine does not start.
Start Failure / No Start Condition
AL13
Controller displays AL13 / Stop Failure; the engine continues running after a stop command.
Stop Failure / Fuel Solenoid or Stop Circuit Fault
AL14
Controller displays AL14 / Alternator Overvoltage while running under light load.
Generator Overvoltage Protection Trip
AL15
Controller displays AL15 / Alternator Undervoltage and the load is dropped.
Generator Undervoltage / Underfrequency Trip
AL16
Controller displays AL16 / Phase Sequence Error when transferring load.
Incorrect Phase Rotation / Phase Sequence Fault
AL17
Controller displays AL17 / Mains Failure, but the generator does not start in AUTO mode.
Mains Sensing / Auto Start Logic Fault
AL18
Controller displays AL18 / CAN Communication Error between the engine ECU and APM controller.
CANbus Communication Fault
AL19
Controller displays AL19 / Air Filter Clogged or Intake Restriction Warning
Air Intake Restriction
AL20
Controller displays AL20 / Fuel Leak Detected (if equipped with leak sensor) and shuts down engine
Fuel Leak Detection Alarm
AL21
Controller displays AL21 / Oil Leak Detected (if equipped with leak sensor) and prevents start
Oil Leak Detection Alarm
AL22
Controller displays AL22 / Alternator Overcurrent and trips output breaker
Generator Overcurrent / Short Circuit Protection
AL23
Controller displays AL23 / Earth Fault or Ground Fault Alarm
Ground Fault Protection Trip
AL24
Controller displays AL24 / Frequency High and disconnects load
Overfrequency Protection Trip
AL25
Controller displays AL25 / Frequency Low and load is shed
Underfrequency Protection Trip
Symptom
Battery repeatedly discharges between test runs despite the charger being installed.
Chronic Battery Discharge / Standby Power Issue
Symptom
Blue smoke from exhaust and rising oil consumption
Oil Burning / Internal Engine Wear
Symptom
Control panel display is blank or intermittent; the generator is otherwise functional.
Controller Power Supply / Display Fault
Symptom
Excessive black smoke from exhaust during operation
Overfueling / Incomplete Combustion
Symptom
Excessive vibration of generator set during operation
Abnormal Vibration / Misalignment
Symptom
Generator cranks but will not start, no error code displayed
No-Start Condition Without Diagnostic Code
Symptom
Generator is excessively noisy compared to normal operation
Abnormal Mechanical or Exhaust Noise
Symptom
Generator output voltage is unstable or fluctuating under steady load
Voltage Instability / Poor Regulation
Symptom
Generator runs but produces no AC voltage at terminals
Loss of Excitation / No Output Voltage
Symptom
Generator starts then stalls after a few seconds, no specific code
Start-Then-Stall Fuel Delivery Fault
Symptom
Generator starts unexpectedly or attempts to start with mains power present
Unintended Start / Control Logic Fault
Symptom
Generator will not transfer load automatically when mains fails, but can be loaded manually
Automatic Transfer Switch Control Fault
Symptom
Visible engine oil leak on floor or inside canopy, no code
External Engine Oil Leak
Symptom
Visible fuel leak from baseframe or under engine, no specific code
External Fuel Leak
Symptom
White smoke from exhaust, especially on startup
Incomplete Combustion / Low Cylinder Temperature
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| AL01 |
The controller displays AL01 / Low Oil Pressure, and the generator shuts down shortly after starting.
|
Low Oil Pressure Shutdown | View Details |
| AL02 |
The controller displays AL02 / High Engine Temperature, and the generator shuts down during load.
|
Engine Overtemperature Shutdown | View Details |
| AL03 |
The controller shows AL03 / Overspeed, and the generator stops immediately after a start attempt.
|
Engine Overspeed Protection Trip | View Details |
| AL04 |
The controller displays AL04 / Underspeed, and the generator fails to reach rated frequency.
|
Engine Underspeed/Underfrequency Fault | View Details |
| AL05 |
The controller shows AL05 / Low Fuel Level and prevents automatic starting.
|
Low Fuel Level Alarm | View Details |
| AL06 |
The controller displays AL06 / Battery Voltage Low, and the generator will not crank.
|
Low DC Battery Voltage | View Details |
| AL07 |
The controller shows AL07 / Battery Voltage High while the generator is running or on standby.
|
High DC Battery Voltage | View Details |
| AL08 |
The controller displays AL08 / Emergency Stop, and the generator cannot start in AUTO mode.
|
Emergency Stop Circuit Active | View Details |
| AL09 |
Controller shows AL09 / Low Coolant Level and prevents automatic start.
|
Low Coolant Level Alarm | View Details |
| AL10 |
Controller displays AL10 / Oil Temperature High and the engine shuts down under load.
|
High Oil Temperature Shutdown | View Details |
| AL11 |
Controller displays AL11 / Preheating Fault and the engine is hard to start in cold weather.
|
Engine Preheater / Glow Plug Circuit Fault | View Details |
| AL12 |
Controller displays AL12 / Start Failure after several crank attempts; the engine does not start.
|
Start Failure / No Start Condition | View Details |
| AL13 |
Controller displays AL13 / Stop Failure; the engine continues running after a stop command.
|
Stop Failure / Fuel Solenoid or Stop Circuit Fault | View Details |
| AL14 |
Controller displays AL14 / Alternator Overvoltage while running under light load.
|
Generator Overvoltage Protection Trip | View Details |
| AL15 |
Controller displays AL15 / Alternator Undervoltage and the load is dropped.
|
Generator Undervoltage / Underfrequency Trip | View Details |
| AL16 |
Controller displays AL16 / Phase Sequence Error when transferring load.
|
Incorrect Phase Rotation / Phase Sequence Fault | View Details |
| AL17 |
Controller displays AL17 / Mains Failure, but the generator does not start in AUTO mode.
|
Mains Sensing / Auto Start Logic Fault | View Details |
| AL18 |
Controller displays AL18 / CAN Communication Error between the engine ECU and APM controller.
|
CANbus Communication Fault | View Details |
| AL19 |
Controller displays AL19 / Air Filter Clogged or Intake Restriction Warning
|
Air Intake Restriction | View Details |
| AL20 |
Controller displays AL20 / Fuel Leak Detected (if equipped with leak sensor) and shuts down engine
|
Fuel Leak Detection Alarm | View Details |
| AL21 |
Controller displays AL21 / Oil Leak Detected (if equipped with leak sensor) and prevents start
|
Oil Leak Detection Alarm | View Details |
| AL22 |
Controller displays AL22 / Alternator Overcurrent and trips output breaker
|
Generator Overcurrent / Short Circuit Protection | View Details |
| AL23 |
Controller displays AL23 / Earth Fault or Ground Fault Alarm
|
Ground Fault Protection Trip | View Details |
| AL24 |
Controller displays AL24 / Frequency High and disconnects load
|
Overfrequency Protection Trip | View Details |
| AL25 |
Controller displays AL25 / Frequency Low and load is shed
|
Underfrequency Protection Trip | View Details |
| – |
Battery repeatedly discharges between test runs despite the charger being installed.
|
Chronic Battery Discharge / Standby Power Issue | View Details |
| – |
Blue smoke from exhaust and rising oil consumption
|
Oil Burning / Internal Engine Wear | View Details |
| – |
Control panel display is blank or intermittent; the generator is otherwise functional.
|
Controller Power Supply / Display Fault | View Details |
| – |
Excessive black smoke from exhaust during operation
|
Overfueling / Incomplete Combustion | View Details |
| – |
Excessive vibration of generator set during operation
|
Abnormal Vibration / Misalignment | View Details |
| – |
Generator cranks but will not start, no error code displayed
|
No-Start Condition Without Diagnostic Code | View Details |
| – |
Generator is excessively noisy compared to normal operation
|
Abnormal Mechanical or Exhaust Noise | View Details |
| – |
Generator output voltage is unstable or fluctuating under steady load
|
Voltage Instability / Poor Regulation | View Details |
| – |
Generator runs but produces no AC voltage at terminals
|
Loss of Excitation / No Output Voltage | View Details |
| – |
Generator starts then stalls after a few seconds, no specific code
|
Start-Then-Stall Fuel Delivery Fault | View Details |
| – |
Generator starts unexpectedly or attempts to start with mains power present
|
Unintended Start / Control Logic Fault | View Details |
| – |
Generator will not transfer load automatically when mains fails, but can be loaded manually
|
Automatic Transfer Switch Control Fault | View Details |
| – |
Visible engine oil leak on floor or inside canopy, no code
|
External Engine Oil Leak | View Details |
| – |
Visible fuel leak from baseframe or under engine, no specific code
|
External Fuel Leak | View Details |
| – |
White smoke from exhaust, especially on startup
|
Incomplete Combustion / Low Cylinder Temperature | View Details |
No matching codes found
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