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Old 08-24-2019, 02:33 PM   #1
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ONAN 12.5 HDKCB-code13 &36

Good day,
My diesel generator quit working this week and have a code 36; done all basic maintenance. Oil and filter, coolant, new oil and temp sensors replaced actuator ,fuel filter ,fuel pump, air filter. Checked pins on plugs. It ran for about 10 minutes so checked output voltage 1 leg was 129-130
another was 125-. I had a code 13 so? I replaced the transformer-315-0899. It started checked voltage 1 leg was 121 the other 127
ran about 10 minutes and quit with the 36 code again!
Question is, is the board my only option? or is there any other test I can do.
Thank you in advance.
SAL
ONAN 12.5 HDKCB11506A SER#A50741922
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Old 08-25-2019, 06:32 AM   #2
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Originally Posted by airconsal View Post
ran about 10 minutes and quit with the 36 code again!
Question is, is the board my only option? or is there any other test I can do.
ONAN 12.5 HDKCB11506A SER#A50741922
I have the same generator. My cure was the board, however others have replaced the fuel pump, fuel hose between the tank and fuel pump. I changed the fuel pump and swapped the fuel lines feed and return but in the end it was the board. Some have wired a fuel pump switch to bypass the board. I couldn't think of a way to do that and retain the AGS Auto Generator Start feature I use frequently.

Look at post #11
Diesel Onan Intermittantly Shuts Off - Code 36
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Old 08-25-2019, 01:37 PM   #3
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Thanks I will just have to suck it up and buy the board have replaced everything on the list from Onan . Just 800.00 is hard to part with!
Thanks for your reply.
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Old 08-25-2019, 02:43 PM   #4
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Chiming in here...
I had a similar issue with my 8kw HDKAK. Would run for maybe 30-45 min and then shutdown with that code. I tried everything I could think of, but got the same result. Finally dropped it at local Cummins/Onan folks.
End result was that board. I happened to be there when they were installing the new one - sure didn't look like it was solid gold to me . Guess you gotta pay if you wanna play.


Hope it fixes yours too!
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Old 08-25-2019, 03:22 PM   #5
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Thanks I will just have to suck it up and buy the board have replaced everything on the list from Onan . Just 800.00 is hard to part with!
Thanks for your reply.
Remember the Cummins Power Club for your 10% discount! https://www.cumminspowerclub.com/
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Old 09-04-2019, 10:22 AM   #6
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Onan fix

Thanks for your help.
Took a ride to Cummins WPB Florida and purchased the board.
I put the board in before Hurricane Dorian struck.
I let it run under load for 3 hours and purred like a kitten.

Sal
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