Engine Failed All Crank Attempts, Overcrank Shutdown
The KUBOTAGEN-E10 (Cummins Onan) diesel fault code means: Engine Failed All Crank Attempts, Overcrank Shutdown. This is a serious severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- moderate
- Estimated cost
- DIY: $10-$80 for a fuel filter or glow plugs. Pro diagnosis and repair: $150-$600 depending on root cause. Fuel shutoff solenoid replacement runs $200-$400 at a shop. Injection pump failure is $600 or more.
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Common Symptoms
- Panel displays E:10 and all start attempts have stopped
- You hear repeated cranking sounds but the engine never catches and runs
- Generator is completely silent after the overcrank sequence finishes
- STOP or fault indicator light is solid on the control panel
- Generator does not respond to a manual restart until the fault is cleared
- Automatic transfer switch never transfers power to your home or RV loads
- Battery voltage may be noticeably lower than normal after multiple crank cycles
Probable Causes (Ranked by Likelihood)
- Fuel supply problem, such as empty tank, closed shutoff valve, or air-locked fuel line preventing diesel from reaching the injectors Very Likely
- Clogged or restricted fuel filter starving the injection pump during cranking Very Likely
- Weak or discharged battery providing insufficient cranking speed for the engine to fire Likely
- Faulty or seized fuel shutoff solenoid not opening to allow fuel flow when the controller commands a start Likely
- Failed glow plugs leaving combustion chambers too cold to ignite diesel, especially in cold ambient temperatures Possible
- Air in the fuel system from a recent filter change, dry tank, or cracked fuel line causing the injection pump to lose prime Possible
- Faulty fuel injection pump or injector delivering insufficient fuel pressure during the start sequence Less Likely
Step-by-Step Diagnostic Procedure
Start simple. Check the fuel tank level first. Even if the gauge shows fuel, rock the unit or use a flashlight to visually confirm diesel is present. A sticky float gauge can lie.
Inspect the fuel shutoff valve on the tank and the secondary valve near the filter. Both must be fully open. A partially closed valve is enough to cause an overcrank fault.
Check your battery voltage with a multimeter. With the engine off, a healthy 12V starting battery should read 12.4 to 12.7 volts. Anything below 12.0 volts means the battery is too weak to spin the engine fast enough to fire. Charge or replace the battery before attempting a restart.
Locate the fuel filter and inspect it. If it looks dark, cloudy, or you cannot remember the last time it was changed, replace it. A clogged filter is one of the most common causes of overcrank faults on Kubota diesel gensets.
Listen carefully during the crank cycle. A faint click instead of strong cranking usually points to a battery or connection problem. Strong cranking that produces no firing usually points to a fuel or glow plug problem.
Check glow plug operation if ambient temperature is below 50 degrees F. On most Kubota packages you will see a PREHEAT or WAIT indicator light on the panel before cranking begins. If that light does not come on, the glow plug circuit may be faulty. Testing individual glow plugs requires a multimeter and removing the glow plug connectors from the valve cover. Each plug should measure 0.5 to 2 ohms. An open reading means the plug is failed.
If you suspect air in the fuel system, locate the manual priming pump on the fuel filter housing. Pump it by hand until firm resistance is felt, which usually takes 20 to 40 strokes. Then attempt a restart. This step requires no tools.
If fuel, battery, and glow plugs all check out and the engine still will not start, the fuel shutoff solenoid or injection pump requires evaluation with Kubota Diagmaster diagnostic software. This is the point to call a certified technician.
Frequently Asked Questions
What does Kubota genset code E10 mean?
E10 means the controller tried to start the engine through all of its programmed crank attempts and the engine never fired. To protect the starter motor and battery from damage, the controller stopped trying and locked out further start attempts until you clear the fault. The most common reasons are a fuel supply problem, a dead or weak battery, or a clogged fuel filter.
Can my generator still run with this code?
No. An E10 fault is a hard lockout. The generator will not attempt another start until you identify the cause, fix it, and manually clear the fault code on the panel. Simply pressing START again will not work.
How much does it cost to fix an E10 overcrank fault?
If the fix is a new fuel filter or a battery charge, you are looking at $10 to $80 in DIY parts. If a technician needs to replace a fuel shutoff solenoid or bleed the fuel system, expect $150 to $400. An injection pump failure is the worst-case scenario at $600 or more in parts and labor.
Will the generator start the next time the power goes out?
Not until the fault is cleared and the root cause is fixed. While E10 is active, the controller blocks all automatic start commands from an ATS as well as manual panel starts. If you depend on this unit for backup power, treat E10 as an urgent repair, not something to defer.
E10 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown: