Cummins/Onan DFEK troubleshooting: 98 fault codes and 15 symptom-cause-remedy entries from the manufacturer's own service documentation.
Cummins/Onan DFEK — full specs, parts & maintenance.
All Cummins/Onan fault codes →
| Code | Meaning | Cause | Remedy |
|---|---|---|---|
| 1131 | Battle Short Active | ||
| 1416 | Fail to Shutdown | ||
| 121 | Speed Signal Lost (Loss of Speed Sense) | ||
| 234 | Overspeed | ||
| 1433 | Local Emergency Stop | ||
| 1434 | Remote Emergency Stop | ||
| 2335 | Excitation Fault (Loss of Voltage Sense) | ||
| 1123 | Shutdown After Battle Short | ||
| 121 | SPEED SIGNAL LOST — Shutdown | No magnetic pickup pulses were sensed for a Loss of Speed delay. If a magnetic pickup is disabled, this fault is not activated. | |
| 135 | OIL PRESS SENSOR OOR HIGH — Warning | The oil pressure sensor output is out of range (OOR), high. | |
| 141 | OIL PRESS SENSOR OOR LOW — Warning | The oil pressure sensor output is out of range (OOR), low. | |
| 143 | PRE-LOW OIL PRESSURE — Warning | The engine oil pressure is approaching an unacceptable level. | Indicates engine oil pressure has dropped below the warning trip point. If the generator is powering critical loads and cannot be shut down, wait until the next shutdown period and then follow the code 415 procedure. |
| 144 | COOLANT SENSOR OOR LOW — Warning | The coolant temperature sensor output is out of range (OOR), low. | |
| 145 | COOLANT SENSOR OOR HIGH — Warning | The coolant temperature sensor output is out of range (OOR), high. | |
| 146 | PRE-HIGH COOLANT TEMP — Warning | The engine is operating near cooling system capacity. Increase in load or higher ambient temperature may cause High Coolant Temp (code 151) shutdown. | Indicates the engine is operating near cooling system capacity. Increase in load or higher ambient temperature may cause a High Coolant Temp (151) shutdown. Review code 151 correction list for other possible causes. |
| 151 | HIGH COOLANT TEMP — Shutdown | The engine coolant temperature is above normal and has reached the Shutdown trip point. | Allow the engine to cool down completely before proceeding with the following checks: 1. Look for possible coolant leakage points and repair them if necessary. 2. Check the coolant level and replenish it if low. 3. Check for obstructions to cooling airflow and correct them as necessary. 4. Check the fan belt, and repair or tighten it if necessary. 5. Check the blower fan and circulation pumps on remote radiator installations. 6. Reset the control and restart after locating and correcting the problem. |
| 153 | INTAKE MANIFOLD TEMP OOR HIGH — Warning | The intake manifold temperature sensor is out of range (OOR), high. | |
| 154 | INTAKE MANIFOLD TEMP OOR LOW — Warning | The intake manifold temperature sensor is out of range (OOR), low. | |
| 155 | INTAKE MANIFOLD TEMP HIGH — Shutdown | The intake manifold temperature sensor is above normal and has reached the shutdown trip point. Large load or high ambient temperature may be the cause. | Indicates the engine has overheated (intake manifold temperature has risen above the shutdown trip point). Large load or high ambient temperature may be the cause. Review the code 151 correction list for other possible causes. |
| 195 | COOLANT LEVEL OOR HIGH — Warning | A sensor on the radiator has detected that the coolant level is out of range (OOR), high. | |
| 196 | COOLANT LEVEL OOR LOW — Warning | A sensor on the radiator has detected that the coolant level is out of range (OOR), low. | |
| 197 | COOLANT LEVEL LOW — Warning | A sensor on the radiator has detected that the coolant level is below normal. | Indicates engine coolant level has fallen below the trip point. If the generator is powering critical loads and cannot be shut down, wait until the next shutdown period. If the engine can be stopped, allow the engine to cool down completely before proceeding: 1. Look for coolant leakage points and repair if necessary. 2. Check the coolant level and replenish it if low. 3. Reset the control and restart after locating and correcting problem. |
| 234 | OVERSPEED — Shutdown | The engine has exceeded normal operating speed. The default thresholds are 1725 RPM (50 Hz) or 2075 RPM (60 Hz). | |
| 285 | ECM PGN TIMEOUT — Shutdown | Datalink failure. PowerCommand® 2.3 control not responding to the engine control module. | |
| 286 | ECM CONFIGURABLE ERROR — Shutdown | An engine control module configuration error – out of calibration. | |
| 359 | FAIL TO START — Shutdown | The system has failed to start after a set number of crank attempts. This indicates a possible fuel system or air induction problem (engine cranks but fails to start). | Allow the engine to cool down completely before proceeding with the following checks: 1. Check for an empty fuel tank, fuel leaks, or blocked fuel lines, and correct as required. 2. Check for a dirty fuel filter and replace it if necessary. 3. Check for a dirty or blocked air filter and replace it if necessary. 4. Reset the control and restart after correcting the problem. |
| 415 | LOW OIL PRESSURE — Shutdown | The engine oil pressure has dropped below normal and has reached the shutdown trip point. | Allow the engine to cool down completely before proceeding with the following checks: 1. Check the oil level, lines, and filters. 2. If the oil system is OK but the oil level is low, replenish it. 3. Reset the control and restart after locating and correcting the problem. |
| 421 | OIL TEMP HIGH — Shutdown | The engine oil temperature is above normal and has reached the shutdown trip point. (I/O Module option). | |
| 425 | OIL TEMP OOR — Shutdown | The engine oil temperature output is out of range (OOR). High or low. (I/O Module option). | |
| 426 | DATA LINK ERROR — Shutdown | Datalink failure. No communications between the PowerCommand® 2.3 control and the engine control module. | |
| 427 | CAN LINK LOST — Warning | Datalink fault. Indicates that important data was lost between the PowerCommand® 2.3 control and the engine control module. | |
| 441 | LOW BATTERY — Warning | Battery voltage supply to the control is approaching a low level at which unpredictable operation can occur. | If the engine can be stopped, allow the engine to cool down completely before proceeding: 1. If there are poor battery cable connections, clean the battery cable terminals and tighten all connections. 2. Check the battery charge voltage float level if applicable (raise float level). 3. If there is a discharged or defective battery, check the battery charger fuse. Recharge or replace the battery. |
| 442 | HIGH BATTERY — Warning | Battery voltage supply to the control is approaching a high level at which damage to the control can occur. | If the engine can be stopped, allow the engine to cool down completely before proceeding: 1. If there are poor battery cable connections, clean the battery cable terminals and tighten all connections. 2. Check the battery charge float level, if applicable (lower float level). |
| 488 | INTAKE MANIFOLD TEMP HIGH — Shutdown | The intake manifold temperature is above normal and has reached the shutdown trip point. (I/O Module option). Large load or high ambient temperature may be the cause. | Indicates the engine has overheated (intake manifold temperature has risen above the shutdown trip point). Large load or high ambient temperature may be the cause. Review the code 151 correction list for other possible causes. |
| 689 | ENGINE SPEED ERRATIC — Shutdown | A fault condition in the engine crankshaft sensor circuit. | |
| 781 | CAN LINK LOST — Shutdown | Datalink failure. No communications between the PowerCommand® 2.3 control and the engine control module. | |
| 1117 | ECM POWER LOST — Warning | Battery voltage supply to the engine control module was lost. "Keyswitch" to the ECM was NOT removed for 30 seconds before removing battery power to the ECM (removing battery cable). | To reset: 1. Press the Stop button, then press the Emergency Stop button and wait for 30 seconds. 2. Re-set the Emergency Stop and select an operating mode (manual or remote). |
| 1123 | SHUTDOWN AFTER BS — Shutdown | A shutdown fault occurred while the Battle Short mode was enabled. | |
| 1131 | BATTLE SHORT ACTIVE — Warning | The control is in Battle Short mode – used to bypass several fault shutdowns for generator set operation during emergencies. | |
| 1246 | GENERIC ENGINE FAULT — Warning | Engine control fault code not recognized by the PowerCommand® 2.3 control. | |
| 1311 | CONFIGURABLE INPUT 1 — Configurable | The nature of the fault is an optional customer selection. Example inputs: Low Fuel Day Tank, Water In Fuel, Ground Fault, etc. | Each of the fault functions can be programmed (using the InPower service tool or by accessing the Setup menu), as follows: 1. Event, Warning, or Shutdown level if Function Select = Fault Input. 2. Change the display name using up to 32 characters. |
| 1312 | CONFIGURABLE INPUT 2 — Configurable | The nature of the fault is an optional customer selection. Example inputs: Low Fuel Day Tank, Water In Fuel, Ground Fault, etc. | Each of the fault functions can be programmed (using the InPower service tool or by accessing the Setup menu), as follows: 1. Event, Warning, or Shutdown level if Function Select = Fault Input. 2. Change the display name using up to 32 characters. |
| 1317 | CONFIGURABLE INPUT 3 — Configurable | The nature of the fault is an optional customer selection. Example inputs: Low Fuel Day Tank, Water In Fuel, Ground Fault, etc. | Each of the fault functions can be programmed (using the InPower service tool or by accessing the Setup menu), as follows: 1. Event, Warning, or Shutdown level if Function Select = Fault Input. 2. Change the display name using up to 32 characters. |
| 1318 | CONFIGURABLE INPUT 4 — Configurable | The nature of the fault is an optional generator set input. Example inputs: Low Fuel Day Tank, Water In Fuel, Ground Fault, etc. | Each of the fault functions can be programmed (using the InPower service tool or by accessing the Setup menu), as follows: 1. Event, Warning, or Shutdown level if Function Select = Fault Input. 2. Change the display name using up to 32 characters. |
| 1416 | FAIL TO SHUTDOWN — Warning | A shutdown fault is active, but is being bypassed by Battle Short. The generator set continues to run after receiving a shutdown command from the controller. The Battle Short feature is enabled (this is used to bypass several critical fault shutdowns therefore allowing generator set operation during emergencies). | |
| 1417 | FAILURE TO POWER DOWN — Shutdown | The control is powered up after attempting to go to sleep. | |
| 1433 | LOCAL EMERGENCY STOP — Shutdown | A Local Emergency Stop has been activated. | Emergency Stop shutdown status can be reset only at the local control panel. After locating and correcting problem, reset the local/remote Emergency Stop button as follows: 1. De-activate (disable) the Emergency Stop button. 2. Press the Stop button. 3. Select the desired operating mode (manual or remote). |
| 1434 | REMOTE EMERGENCY STOP — Shutdown | A Remote Emergency Stop has been activated. | Emergency Stop shutdown status can be reset only at the local control panel. After locating and correcting problem, reset the local/remote Emergency Stop button as follows: 1. De-activate (disable) the Emergency Stop button. 2. Press the Stop button. 3. Select the desired operating mode (manual or remote). |
| 1435 | LOW COOLANT TEMP — Warning | The engine coolant temperature is below the adjusted setpoint. This may indicate that the coolant heater is not operating or is not circulating coolant. | If the engine can be stopped, allow the engine to cool down completely before proceeding with the following checks: 1. The coolant heater is not connected to a power supply. Check for a blown fuse or disconnected heater cable, and correct it as required. 2. Look for possible coolant leaks and repair as required. Check for low coolant level and replenish, if required. |
| 1438 | FAIL TO CRANK — Shutdown | The generator set has failed to sense rotation for two start attempts. This indicates a possible fault with the control, speed sensing, or the starting system. | See code 441 for corrective action. |
| 1442 | WEAK BATTERY — Warning | The generator set battery voltage is below battery thresholds during cranking. During cranking, the battery voltage is at, or below, the weak battery warning trip point for a time greater than, or equal to, the weak battery set time. | See code 441 for corrective action. |
| 1446 | HIGH AC VOLTAGE — Shutdown | One or more measured AC output voltages have exceeded the threshold for longer than a specified time limit. The threshold and time limits are 130% of nominal for zero seconds or 110% of nominal for ten seconds. | |
| 1447 | LOW AC VOLTAGE — Shutdown | The measured AC output voltage is below the threshold for longer than a specified time limit. The threshold and time limits are 85% of nominal for ten seconds. | |
| 1448 | UNDER FREQUENCY — Shutdown | The alternator frequency is 6 Hz under the nominal frequency. The generator set frequency has dropped below 90% of nominal for approximately ten seconds. | Allow the engine to cool down completely before proceeding with the following checks: 1. Check the fuel supply. 2. Check the air intake supply. 3. Check the load and correct any overload. |
| 1449 | OVER FREQUENCY — Shutdown | The alternator frequency is 6 Hz above the nominal frequency. | |
| 1469 | SPEED HZ MATCH — Shutdown | Measured engine speed and measured alternator AC output frequency do not agree. | |
| 1471 | HIGH AC CURRENT — Warning | The alternator output current (one or more phases) has exceeded safe operating limits. | |
| 1472 | HIGH AC CURRENT — Shutdown | The alternator output current (one or more phases) has exceeded the alternator's current rating. | |
| 1845 | WATER IN FUEL OOR HIGH — Warning | The water in fuel sensor is out of range (OOR), high. | |
| 1846 | WATER IN FUEL OOR LOW — Warning | The water in fuel sensor is out of range (OOR), low. | |
| 1852 | WATER IN FUEL — Warning | The water in fuel is above normal and has reached the warning trip point. | If the engine can be stopped, allow the engine to cool down completely before proceeding with the following checks: 1. Check the fuel in the tank (local or remote). 2. Drain and re-fill the tank if necessary. Be aware of all Health and Safety, and environmental issues if draining the tank. |
| 1853 | Annunciator Fault 2 — Configurable | The nature of the annunciator fault is an optional customer selection. | |
| 1854 | Annunciator Fault 3 — Configurable | The nature of the annunciator fault is an optional customer selection. | |
| 1855 | Annunciator Fault 1 — Configurable | The nature of the annunciator fault is an optional customer selection. | |
| 1944 | ANNUNCIATOR OUTPUT CONFIGURATION ERROR — Warning | A mismatch in the configuration of one of the annunciator relay outputs. | |
| 1965 | EXHAUST TEMPERATURE OOR — Warning | The exhaust temperature sensor is out of range (OOR), high or low. (Aux 101 I/O option). | |
| 1992 | ENGINE OVERSPEED — Warning | The engine has exceeded normal operating speed. The default thresholds are 1725 RPM (50 Hz) or 2075 RPM (60 Hz). (ECM fault code). | |
| 2224 | FUEL LEVEL OOR — Warning | The fuel level sensor is out of range (OOR), high or low. (Aux 101 I/O option). | |
| 2335 | EXCITATION FAULT — Shutdown | A loss of voltage or frequency sensing from the generator has occurred. | |
| 2398 | AMBIENT TEMPERATURE OOR — Warning | The ambient temperature sensor is out of range (OOR), high or low. (Aux 101 I/O option). | |
| 2542 | VOLTAGE BIAS OOR — Warning | The voltage bias circuit output is out of range (OOR), high or low. (Aux 101 I/O option). | |
| 2545 | KEYSWITCH RESET REQUIRED — Shutdown | A datalink failure. Communications are lost between the PowerCommand® 2.3 control and the engine control module. | |
| 2619 | AUX 101 ANALOG INPUT 1 — Diagnostic | The nature of the Base I/O Module event is an optional customer selection. (Aux 101 I/O Module option). | Each event function can be programmed (using InPower service tool or access to the Setup menu), as follows: 1. Change display name using up to 32 characters 2. Select active low or high input. |
| 2621 | AUX 101 ANALOG INPUT 2 — Diagnostic | The nature of the Base I/O Module event is an optional customer selection. (Aux 101 I/O Module option). | See code 2619 |
| 2622 | AUX 101 ANALOG INPUT 3 — Diagnostic | The nature of the Base I/O Module event is an optional customer selection. (Aux 101 I/O Module option). | See code 2619 |
| 2623 | AUX 101 ANALOG INPUT 4 — Diagnostic | The nature of the Base I/O Module event is an optional customer selection. (Aux 101 I/O Module option). | See code 2619 |
| 2624 | AUX 101 ANALOG INPUT 5 — Diagnostic | The nature of the Base I/O Module event is an optional customer selection. (Aux 101 I/O Module option). | See code 2619 |
| 2625 | AUX 101 ANALOG INPUT 6 — Diagnostic | The nature of the Base I/O Module event is an optional customer selection. (Aux 101 I/O Module option). | See code 2619 |
| 2626 | AUX 101 ANALOG INPUT 7 — Diagnostic | The nature of the Base I/O Module event is an optional customer selection. (Aux 101 I/O Module option). | See code 2619 |
| 2627 | AUX 101 ANALOG INPUT 8 — Diagnostic | The nature of the Base I/O Module event is an optional customer selection. (Aux 101 I/O Module option). | See code 2619 |
| 2628 | AUX 102 DIGITAL INPUT 9 — Diagnostic | The nature of the Aux I/O Module event is an optional customer selection. (Aux 102 I/O Module option). | Each event function can be programmed (using InPower service tool or access to the Setup menu), as follows: 1. Change display name using up to 32 characters 2. Select active low or high input. |
| 2629 | AUX 102 DIGITAL INPUT 10 — Diagnostic | The nature of the Aux I/O Module event is an optional customer selection. (Aux 102 I/O Module option). | See code 2628 |
| 2631 | AUX 102 DIGITAL INPUT 11 — Diagnostic | The nature of the Aux I/O Module event is an optional customer selection. (Aux 102 I/O Module option). | See code 2628 |
| 2632 | AUX 102 DIGITAL INPUT 12 — Diagnostic | The nature of the Aux I/O Module event is an optional customer selection. (Aux 102 I/O Module option). | See code 2628 |
| 2676 | ALTERNATOR FREQUENCY CONFLICT — Shutdown | The measured alternator line frequency and measured alternator excitation frequency do not agree. | |
| 2677 | FAIL TO STOP — Shutdown | The generator set continues to run after receiving a stop command from the controller. | |
| 2678 | CHARGER FAILURE — Warning | The battery charging alternator has not reached an acceptable voltage range within the selected time period (default is 120 seconds). This warning is also displayed if your alternator is a type that does not support the control's charging alternator logic functionality. | If this occurs, this warning can be disabled if the Charging Alt. Enable setting is set to "No". |
| 2693 | SPEED BIAS OOR — Warning | The speed bias circuit output is out of range (OOR), high or low. (Aux 101 I/O Module option). | |
| 2694 | ALTERNATOR RTD OOR — Warning | The alternator RTD sensor is out of range (OOR), high or low. (Aux 101 I/O Module option). | |
| 2696 | ALTERNATOR RTD TEMP HIGH — Shutdown | The alternator temperature is above normal and has reached the shutdown trip point. (I/O Module option). | |
| 2729 | I/O MODULE LOST — Warning | An intermittent datalink between the I/O module and the control board. (Aux 101 I/O Module option). | |
| 2731 | I/O MODULE LOST — Shutdown | The datalink between the I/O module and the control board is lost. (Aux 101 I/O Module option). | |
| 2897 | FACTORY BLOCK CORRUPT — Shutdown | A fatal software error occurred in the PowerCommand® 2.3 control. | |
| 2898 | PERIODIC/FAULT CORRUPT — Warning | Either the periodic data file or the fault history file has been corrupted. | Remove and re-apply power to the control to clear the fault. (Periodic and/or fault history data will be lost after re-setting the control). |
| 2899 | USER BLOCK CORRUPT — Shutdown | A fatal software error occurred in the PowerCommand® 2.3 control. | |
| 2911 | TRIM BLOCK CORRUPT — Shutdown | A fatal software error occurred in the PowerCommand® 2.3 control. | |
| 2964 | INTAKE MANIFOLD TEMPERATURE HIGH — Warning | The engine has begun to overheat (intake manifold temperature has risen to an unacceptable level). Increase in load or higher ambient temperature may cause Intake Manifold Temp High (code 155) shutdown. | If the engine can be stopped, allow the engine to cool down completely before proceeding with the following check: 1. Review the code 151 correction list for possible causes. |
| 2972 | FIELD OVERLOAD — Shutdown | The Field Voltage has been above 70 V for eight seconds. |
| Symptom | Cause | Remedy |
|---|---|---|
| Battery completely discharged | Poor battery terminal connection | Clean connections, replace and tighten. |
| Battery completely discharged | Charge alternator/alternator connection fault | Contact your nearest Cummins distributor. |
| Battery completely discharged | Mains battery charger/charger connections fault/mains supply fault | Contact your nearest Cummins distributor. |
| Battery completely discharged | Blown fuse | Contact your nearest Cummins distributor. |
| Battery completely discharged | Battery fault | Contact your nearest Cummins distributor. |
| Battery completely discharged | Newly installed battery shipped dry | Fill with electrolyte and give commissioning charge. |
| Battery low charge | Poor battery connection | Clean connections, reconnect and tighten securely. |
| Battery low charge | Charge alternator/alternator connection fault | Contact your nearest Cummins distributor. |
| Battery low charge | Mains battery charger/charger connections fault | Contact your nearest Cummins distributor. |
| Battery low charge | Inequality in cell charge | Contact your nearest Cummins distributor. |
| Battery low charge | Battery fault | Contact your nearest Cummins distributor. |
| Battery overcharged | Charge alternator fault | Contact your nearest Cummins distributor. |
| Battery overcharged | Mains battery charge fault | Contact your nearest Cummins distributor. |
| Battery overcharged | Low battery fluid level | Check the charger; it may not be shutting off when the charge is complete. |
| Battery terminals getting hot | Poor battery connection | Clean connections, reconnect and tighten securely; Contact your nearest Cummins distributor. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: Poor battery terminal connection; Charge alternator/alternator connection fault; Mains battery charger/charger connections fault/mains supply fault; Blown fuse. See the table for the matching fixes.
Documented causes: Poor battery connection; Charge alternator/alternator connection fault; Mains battery charger/charger connections fault; Inequality in cell charge. See the table for the matching fixes.
Documented causes: Charge alternator fault; Mains battery charge fault; Low battery fluid level. See the table for the matching fixes.