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
Controller displays AL01 / Low Oil Pressure and generator shuts down shortly after start
Low Oil Pressure Shutdown
AL02
Controller displays AL02 / High Engine Temperature and generator shuts down during load
Engine Overtemperature Shutdown
AL03
Controller shows AL03 / Overspeed and generator stops immediately after start attempt
Engine Overspeed Protection Trip
AL04
Controller displays AL04 / Underspeed and generator fails to reach rated frequency
Engine Underspeed / Underfrequency Fault
AL05
Controller shows AL05 / Low Fuel Level and prevents automatic start
Low Fuel Level Alarm
AL06
Controller displays AL06 / Battery Voltage Low and generator will not crank
Low DC Battery Voltage
AL07
Controller shows AL07 / Battery Voltage High while generator is running or on standby
High DC Battery Voltage
AL08
Controller displays AL08 / Emergency Stop and 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 engine shuts down under load
High Oil Temperature Shutdown
AL11
Controller shows AL11 / Preheating Fault and engine is hard to start in cold weather
Engine Preheater / Glow Plug Circuit Fault
AL12
Controller displays AL12 / Start Failure after several crank attempts, engine does not start
Start Failure / No Start Condition
AL13
Controller shows AL13 / Stop Failure, engine continues running after 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 shows AL15 / Alternator Undervoltage and 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 shows AL17 / Mains Failure but generator does not start in AUTO
Mains Sensing / Auto Start Logic Fault
AL18
Controller displays AL18 / CAN Communication Error between engine ECU and APM controller
CANbus Communication Fault
AL19
Controller shows 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 shows 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 shows 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 shows AL25 / Frequency Low and load is shed
Underfrequency Protection Trip
Symptom
Battery repeatedly discharges between test runs despite charger 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, generator 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 |
Controller displays AL01 / Low Oil Pressure and generator shuts down shortly after start
|
Low Oil Pressure Shutdown | View Details |
| AL02 |
Controller displays AL02 / High Engine Temperature and generator shuts down during load
|
Engine Overtemperature Shutdown | View Details |
| AL03 |
Controller shows AL03 / Overspeed and generator stops immediately after start attempt
|
Engine Overspeed Protection Trip | View Details |
| AL04 |
Controller displays AL04 / Underspeed and generator fails to reach rated frequency
|
Engine Underspeed / Underfrequency Fault | View Details |
| AL05 |
Controller shows AL05 / Low Fuel Level and prevents automatic start
|
Low Fuel Level Alarm | View Details |
| AL06 |
Controller displays AL06 / Battery Voltage Low and generator will not crank
|
Low DC Battery Voltage | View Details |
| AL07 |
Controller shows AL07 / Battery Voltage High while generator is running or on standby
|
High DC Battery Voltage | View Details |
| AL08 |
Controller displays AL08 / Emergency Stop and 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 engine shuts down under load
|
High Oil Temperature Shutdown | View Details |
| AL11 |
Controller shows AL11 / Preheating Fault and 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, engine does not start
|
Start Failure / No Start Condition | View Details |
| AL13 |
Controller shows AL13 / Stop Failure, engine continues running after 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 shows AL15 / Alternator Undervoltage and 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 shows AL17 / Mains Failure but generator does not start in AUTO
|
Mains Sensing / Auto Start Logic Fault | View Details |
| AL18 |
Controller displays AL18 / CAN Communication Error between engine ECU and APM controller
|
CANbus Communication Fault | View Details |
| AL19 |
Controller shows 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 shows 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 shows 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 shows AL25 / Frequency Low and load is shed
|
Underfrequency Protection Trip | View Details |
| – |
Battery repeatedly discharges between test runs despite charger 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, generator 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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