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Kohler generator drains battery while running and then shuts down with error code oc

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The rpm sensing in the control module is missing or bad.
Answer these questions for more details:

  1. Does your generator output normal voltage?
  2. Is the starter turning after the Gen is running?
  3. Is the charging of the battery connected?

Posted on Jun 22, 2010

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Kohler 12.5 res gen. Battery is good. Get OC code. If I reset auto switch by clicking off, then clicking run, then clicking auto it will start. Any thoughts on this issue?


OC is Over Crank which generally means it cranked and cranked and failed to start. Turning the switch off and on again is the way to clear the fault. How long is it taking to start whilst cranking? It should start within 8 seconds

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Kohler 12RES only starts on second try


Check gas pressure. Oc is over crank. Means tried to start but did not.

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GENERATOR CLICKS WHEN RUN IS DEPRESSED BUT WILL NOT TURN OVER GOES STRAIGHT TO OC. CHANGED BATTERY NO HELP?


Put it to run while holding the bullseye, you'll see the decimel move, wait for a number other than the run time to show and hit down, up, down, up, down, up then hit the bullseye until you see EC, it should should EC00, if not, select EC00 using up or down, then hit the bullseye until it says save and hit up and the bullseye again.

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1 Answer

Generator won't start. Screen showing OC.


OC means OVERCRANK safety circuit stopped the auto start-up so you wouldn't burn up the starter. There is a reason the generator didn't start. Low battery, not enough fuel pressure, clogged air filter, bad starter... You just have to eliminate as many as you can visually. Rebooting the generator should clear the OC condition and you can try to start it manually.

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Have Kohler 12RES. Gives a CC1 code thenan OC code. Have checked out the starter, it's OK, have cleaned all ground cables and connections and had the battery tested it's OK. Where do I go next?


check your load wires there probaly reversed. I had the same problem friday. The week before the electrican wired it. did the same cc1 then oc. had a generator company come out it was the wireing. my load and netural were reversed.

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I have a Kohler 12RESM1 propane generator with oc/uu code


U need to make sure that the relay driving ur auto start stay closed all thru the crank cycle.

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1 Answer

When I try to start my generator the code oc comes


Check battery volatge while you are cranking engine if voltage drops below 9 vdc you have a bad battery. If it doesn't you probable have a bad starting solenoid or a bad ground at the starting solenoid.

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1 Answer

Hello, I have a Kohler Marine Generator that says OC on the menu when I try to start it. Any ideas?


OC stands for Over Crank. How long does it take before the genset starts?

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