Cummins/Onan MDKD troubleshooting: 24 fault codes and symptom-cause-remedy entries from the manufacturer's own service documentation.
Cummins/Onan MDKD — full specs, parts & maintenance.
All Cummins/Onan fault codes →
| Code | Meaning | Remedy |
|---|---|---|
| A052J727 (Issue 1) | The screen will display a description of the fault, the numeric fault code, and the hour the fault occurred in total generator set running time (see figure below). | Refer to Section 6.4 on page 60 to diagnose and correct the problem. |
| Code No. 1 | Code No. 1 - High Engine Temperature | |
| Code No. 2 | Code No. 2 - Low Oil Pressure | |
| Code No. 3 | Code No. 3 - Service Check | |
| Code No. 4 | Code No. 4 - Overcrank | |
| Code No. 5 | Code No. 5 - Warning Shutdown due to CO | |
| Code No. 7 | Code No. 7 - Loss of Raw Water Flow | |
| Code No. 12 | Code No. 12 - High AC Voltage | |
| Code No. 13 | Code No. 13 - Low AC Voltage | |
| Code No. 14 | Code No. 14 - High AC Frequency | |
| Code No. 15 | Code No. 15 - Low AC Frequency | |
| Code No. 22 | Code No. 22 - Governor Overload | |
| Code No. 23 | Code No. 23 - Faulty Oil Pressure Sender | |
| Code No. 24 | Code No. 24 - Faulty Temperature Sender | |
| Code No. 27 | Code No. 27 - Loss of AC Voltage Sense | |
| Code No. 29 | Code No. 29 - High Battery Voltage | |
| Code No. 32 | Code No. 32 - Starting Fault |
| Symptom | Cause | Remedy |
|---|---|---|
| Press BACK to return to GEN STATUS in order to monitor engine temperature and oil pressure. Service the generator set as required. | The PRE-ALARM status lamp will blink when the engine oil pressure or engine temperature approaches its engine shutdown limit. | |
| Press BACK to return to GEN STATUS. | To adjust the brightness or contrast of the digital display screen, press SCREEN on any GEN STATUS screen, then NEXT to toggle between Brightness and Contrast. | |
| No Code - No Response at Digital Display or Control Switch | ||
| No Code - Starter Engages and Disengages | ||
| No Code - Starting Batteries do not Maintain a Charge | ||
| No Code - No AC Power When Generator Set is Running | ||
| DC Control | Low oil pressure, high coolant temperature, high exhaust temperature and overspeed (option) | The fault breaker trips and stops the genset. See Figure 3-2. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: The PRE-ALARM status lamp will blink when the engine oil pressure or engine temperature approaches its engine shutdown limit.. See the table for the matching fixes.
Documented causes: To adjust the brightness or contrast of the digital display screen, press SCREEN on any GEN STATUS screen, then NEXT to toggle between Brightness and Contrast.. See the table for the matching fixes.
Documented causes: Low oil pressure, high coolant temperature, high exhaust temperature and overspeed (option). See the table for the matching fixes.