Cummins/Onan DQKAN troubleshooting: 10 fault codes and 3 symptom-cause-remedy entries from the manufacturer's own service documentation.
Cummins/Onan DQKAN — full specs, parts & maintenance.
All Cummins/Onan fault codes →
| Code | Meaning | Cause |
|---|---|---|
| Battle short mode | Some shutdown faults are bypassed | |
| Derate | Output power of the genset is reduced in response to a fault condition | |
| Emergency stop | Annunciated whenever either emergency stop signal is received from external switch | |
| Low and high battery voltage warning | Indicates status of battery charging system (failure) | Continuously monitoring battery voltage |
| Weak battery warning | Battery indicates impending failure | Control system tests the battery each time the genset is signaled to start |
| Low coolant level warning | Can be set up to be a warning or shutdown | Set up in control |
| Low coolant temperature warning | Indicates that engine temperature may not be high enough for a 10 second start or proper load acceptance | Engine temperature is low |
| Fail to start (overcrank) shutdown | Control system indicates a fault if the genset fails to start by the completion of the engine crack sequence | Genset fails to start |
| Fail to crank shutdown | Control has signaled starter to crank engine but engine does not rotate | Engine does not rotate |
| Cranking lockout | The control will not allow the starter to attempt to engage or to crank | Not specified in text |
| Symptom | Remedy |
|---|---|
| Battle short mode | If a bypassed shutdown fault occurs, the fault code and description will still be annunciated, but the genset will not shutdown. This will be followed by a fail to shutdown fault. |
| Derate | The Derate function reduces output power of the genset in response to a fault condition. If a Derate command occurs while operating on an isolated bus, the control will issue commands to reduce the load on the genset via contact closures or Modbus. If a Derate command occurs while in utility parallel mode, the control will actively reduce power by lowering the base load kW to the derated target kW. |
| Emergency stop | Annunciated whenever either emergency stop signal is received from external switch. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: Continuously monitoring battery voltage. See the table for the matching fixes.
Documented causes: Control system tests the battery each time the genset is signaled to start. See the table for the matching fixes.
Documented causes: Set up in control. See the table for the matching fixes.