Cummins/Onan HDKAJ troubleshooting: 11 fault codes and symptom-cause-remedy entries from the manufacturer's own service documentation.
Cummins/Onan HDKAJ — 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 |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.