Cummins/Onan MDKAL troubleshooting: 9 fault codes and symptom-cause-remedy entries from the manufacturer's own service documentation.
Cummins/Onan MDKAL — full specs, parts & maintenance.
All Cummins/Onan fault codes →
| Code | Meaning |
|---|---|
| Check Engine | ‘Check Engine’ Fault Shutdown |
| Symptom | Cause | Remedy |
|---|---|---|
| Fault Circuit Breaker CB2 trips | AC over-voltage, overspeed, high exhaust temperature, high coolant temperature, low oil pressure, and low coolant level (optional) | |
| Engine does not stop running | Malfunctioning fuel solenoid or linkage | Pull the stop lever to the right and hold it there until the engine stops (see figure). PULL TO RIGHT AND HOLD UNTIL ENGINE STOPS |
| ENGINE DOES NOT CRANK FROM REMOTE PANEL | Emergency Stop Switch OFF; "Check Generator" or "Check Engine" Fault; Faulty remote circuit | Push ON.; Service the fault as necessary and push fault reset button in. See “CHECK ENGINE” FAULT SHUTDOWN or “CHECK GENERATOR” FAULT SHUTDOWN.; Try starting at the genset control panel. If the genset starts, have the remote circuit repaired as necessary. |
| ENGINE DOES NOT CRANK FROM GENSET PANEL | Emergency Stop Switch OFF; "Check Generator" or "Check Engine" Fault; Cranking voltage too low | Push ON.; Service the fault as necessary and push fault reset button in. See “CHECK ENGINE” FAULT SHUTDOWN or “CHECK GENERATOR” FAULT SHUTDOWN.; a. Clean and tighten or replace the positive (+) and negative (- ) battery cable connectors and cables at the battery and the genset. b. Recharge or replace the battery. Specific gravity for a fully charged battery is approximately 1.260 at 80° F (27° C). |
| ENGINE CRANKS BUT DOES NOT START | Engine not getting fuel; Blocked air inlet; Low engine temperature; Cranking voltage too low | A. Open any closed shutoff valve. b. Check fuel level and refill as necessary. c. Prime the fuel system (p. 24). d. Check for fuel (air) leaks at all fittings and tighten as necessary. e. Replace the fuel filter (p. 23).; Service as necessary.; a. Plug in, repair or install engine coolant and engine oil heaters. b. Replace the engine oil if it is not of the recommended viscosity for the ambient temperature.; a. Clean and tighten or replace the positive (+) and negative (- ) battery cable connectors and cables at the battery and the genset. b. Recharge or replace the battery. Specific gravity for a fully charged battery is approximately 1.260 at 80° F (27° C). |
| "CHECK ENGINE" FAULT SHUTDOWN | Low engine oil pressure; High engine temperature; High exhaust temperature | Check engine oil level, repair any leaks and fill to the proper level (p. 17).; a. Check engine coolant level, repair any leaks and fill to the proper level (p. 18). b. Check V-belt tension (p. 20). c. Clean and service the cooling system as required to restore full cooling capacity (p. 18).; a. Open the sea cock. b. Remove any blockage in the sea water strainer. c. Prime the sea water pump (p. 22). d. Replace the sea water pump impeller (p. 22). e. Clean seaweed and pump debris from heat exchanger (p. 22). f. Remove blockage covering the sea water hull strainer. |
| "CHECK GENERATOR" FAULT SHUTDOWN | Generator overload | Run with less load. |
| NO OUTPUT VOLTAGE | A line circuit breaker is Off. A line circuit breaker has Tripped. | Find out why the circuit breaker was turned Off, make sure it is safe to reconnect power, and then throw the circuit breaker On. Shut down the genset and have service performed as necessary to clear the short circuit or ground fault that caused tripping. Then Reset the circuit breaker and start the genset. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: AC over-voltage, overspeed, high exhaust temperature, high coolant temperature, low oil pressure, and low coolant level (optional). See the table for the matching fixes.
Documented causes: Malfunctioning fuel solenoid or linkage. See the table for the matching fixes.
Documented causes: Emergency Stop Switch OFF; "Check Generator" or "Check Engine" Fault; Faulty remote circuit. See the table for the matching fixes.