KUBOTAGEN-E13 serious Cummins Onan ›

Stop Solenoid Not Responding to Controller Command

Can I Drive?

Yes, But Fix Soon

DIY Difficulty

moderate

Estimated Cost

$40-$150 DIY for solenoid and connector repair. Pro diagnosis and controller replacement can reach $300-$800 depending on parts availability and labor rate.

What does KUBOTAGEN-E13 mean?

The KUBOTAGEN-E13 (Cummins Onan) diesel fault code means: Stop Solenoid Not Responding to Controller Command. This is a serious severity code.

Common Symptoms

Panel displays E:13 and generator enters a fault or lockout state
Generator continues running after you press STOP or the controller sends a stop command
Generator does not shut down at the end of an exercise cycle
Red or amber fault light illuminates alongside the E:13 code
Generator cranks and starts normally but refuses to shut off cleanly
ATS may fail to transfer load back to utility because genset will not release the bus
Repeated E:13 faults appear in the controller fault log during normal stop attempts

Probable Causes (Ranked by Likelihood)

Stop solenoid coil burned out or open-circuit, preventing the fuel shutoff from actuating Very Likely
Wiring harness to the stop solenoid has a broken wire, corroded terminal, or loose connector Very Likely
Stop solenoid plunger mechanically stuck or seized due to varnish, rust, or debris in the fuel system Likely
Controller output driver circuit failed, unable to supply proper voltage to the solenoid Likely
Low battery voltage causing the solenoid to receive insufficient current to actuate fully Possible
Wrong replacement solenoid installed with mismatched voltage or resistance spec Possible
Blown fuse or failed relay in the stop solenoid control circuit Less Likely

Step-by-Step Diagnostic Procedure

Before anything else, locate the physical STOP button on the panel. If the engine will not stop, turn the fuel shutoff valve off manually or disconnect the battery to kill the engine safely. Do not leave a runaway engine unattended.
With the engine off and battery disconnected, locate the stop solenoid on the injection pump. It is usually a small cylindrical device with a single wire or two-wire connector bolted directly to the fuel injection pump body. Check the connector for corrosion, pushed-back pins, or loose fit. Reseat firmly and retest.
Set your multimeter to DC voltage. Reconnect the battery. Have a helper press STOP while you probe the solenoid connector terminals. You should see battery voltage (12V DC) appear at the solenoid terminal for 1-3 seconds during a stop command. No voltage here points to a wiring or controller driver problem, not the solenoid itself.
If voltage IS present at the connector but the solenoid does not move, remove the solenoid and bench-test it. Apply 12V DC directly from the battery with jumper wires. You should hear and feel a click as the plunger extends or retracts. No movement means the solenoid coil is dead and the solenoid must be replaced.
Check solenoid coil resistance with your multimeter set to ohms. A healthy Kubota stop solenoid coil typically reads between 8 and 20 ohms. A reading of zero ohms (shorted) or infinite ohms (open) confirms coil failure. Record the reading before purchasing a replacement.
Inspect the wiring from the solenoid connector back to the controller for chafing, heat damage, or rodent damage. Pay special attention to sections routed near the exhaust manifold. Repair any damaged insulation and verify continuity end-to-end with your multimeter on the continuity setting.
Check the fuse block and any inline fuse or relay associated with the stop solenoid circuit. Refer to your Kubota SQ, GL, or J-series operator manual wiring diagram for the exact fuse location. A blown fuse here is an easy fix but also signals an underlying short that you need to find.
If solenoid, wiring, fuses, and relay all check out but the fault persists, the controller output driver has likely failed internally. At this point you need Kubota Diagmaster diagnostic software and a qualified technician to read live controller output states and confirm whether the ECU is commanding the solenoid correctly.

Frequently Asked Questions

What does Kubota genset code E:13 mean?

E:13 means the controller tried to send a stop command to the fuel shutoff solenoid on the injection pump, but the solenoid did not respond as expected. The most common result is the engine keeps running after you press STOP, or the controller logs the fault because it could not confirm the solenoid activated. This can be caused by a bad solenoid coil, a broken wire, or in rarer cases a failed output circuit inside the controller.

Can my generator still run with this code?

The generator can still produce power while the fault is active, which is why severity is rated serious rather than critical. The real danger is that you may not be able to shut it off reliably. You should not leave the unit unattended or depend on it for extended operation until the fault is resolved. If it will not stop on command, manually close the fuel shutoff valve and address the repair immediately.

How much does it cost to fix code E:13?

If the solenoid itself is bad, a replacement Kubota stop solenoid runs roughly $40 to $100 in parts, and a mechanically inclined owner can swap it in about an hour. If the fix is just a corroded connector or a blown fuse, cost is under $20. If the controller driver circuit has failed, expect a professional repair bill of $300 to $800 or more, since the controller board or full controller assembly may need replacement.

Will the generator start the next time the power goes out?

Most likely yes, it will start. E:13 is a stop solenoid fault, and the solenoid typically only needs to energize during a shutdown sequence. However, if the fault is severe enough that the controller goes into a hard lockout, the unit may refuse to crank until the fault is cleared. Check your specific model's operator manual to confirm whether E:13 triggers a lockout or just a warning. Either way, get the fault resolved before relying on the genset for emergency backup.