Cummins/Onan HDKCA troubleshooting: 15 fault codes and symptom-cause-remedy entries from the manufacturer's own service documentation.
Cummins/Onan HDKCA — full specs, parts & maintenance.
All Cummins/Onan fault codes →
| Code | Meaning |
|---|---|
| Code 1 | Engine Over Temperature |
| Code 2 | Low Oil Pressure |
| Code 3 | Service Check |
| Code 4 | Over Crank |
| Code 12 | Over Voltage |
| Code 13 | Under Voltage |
| Code 14 | Over Frequency |
| Code 15 | Under Frequency |
| Code 19 | Governor Actuator |
| Code 22 | Governor Actuator Overload |
| Code 27 | Voltage Sense |
| Code 29 | High Battery Voltage |
| Code 32 | Low Cranking Speed |
| Code 35 | Control Card Failure |
| Symptom | Remedy |
|---|---|
| Generator voltage is deadly | Disable the automatic genset starting feature of an inverter-charger or other automatic starting device before servicing the genset. Generator electrical output connections must be made by a trained and experienced electrician in accordance with applicable codes. The genset must not be connected to the public utility or any other source of electrical power. An approved switching device must be used to prevent interconnections. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.