Kohler Generator - CO4 Error Shutdown (HELP)

[jennyg]

I am back again with a newly formed question. My Kohler 5kw generator keeps shutting down after about 20 seconds of running. I am getting the following error on the digital readout ‘CO4’. When I look this up in the manual… it is telling me that carbon monoxide is present and I should check for any CO alarms going off, move my vessel away from other potentially polluting engines or check my exhaust on the generator. When I first had this problem, my cabin CO alarm was reaching end-of-life and was beeping intermittently. I thought maybe this was causing the generator to shut down. I have replaced the alarm but still having the same generator issue.

Has anyone else had this problem with the same code and found the issue? I'd like to see if I can fix as myself rather than pay $250 to the mechanic. I sense this is a somewhat straightforward issue but I can't seem to find anyone who can guide me down the right path. Thank you in advance for any help you might be able to give

 

[JimG]

From the service manual for a 5ECD...

"A CO4 error Fault code is displayed if the presence of CO is detected because of the time-weighted average presence of CO. Activates the CO cabin alarms."

"There is a CO sensor module on generator sets with serial number 2085259 and later. The CO sensor module is located behind the ADC 2100. Replace the CO sensor module every two years."

 

[wjglampe]

I was getting the "CO5" alarm on the same generator. Just alarm and not shutting down. Replaced the sensor module that JimG is talking about and the alarm went away. Its a little circuit board and what "looks like" a AA battery attached to it. It is located behind the control panel on the genset. about a $200 part but easy to change. Kohler recommends every 2 years but the Rep. I talked said you can get more time than that out of it...

 

[BigBoysToys]

I had the same issue. Replaced the board mentioned above.

 

[jennyg]

I had the same issue. Replaced the board mentioned above.

Thanks for the insight everyone. Most appreciated.

 

[Ralph vaughn]

I was getting the "CO5" alarm on the same generator. Just alarm and not shutting down. Replaced the sensor module that JimG is talking about and the alarm went away. Its a little circuit board and what "looks like" a AA battery attached to it. It is located behind the control panel on the genset. about a $200 part but easy to change. Kohler recommends every 2 years but the Rep. I talked said you can get more time than that out of it...

Im having this same problem. Is the board behind the panel containing the fuses? Where did you order the part from. Thanks I know you posted this 5 years ago hopefully you're still on CSR.

 

[Atalla]

Im having this same problem. Is the board behind the panel containing the fuses? Where did you order the part from. Thanks I know you posted this 5 years ago hopefully you're still on CSR.

This is it.

https://www.colburnpower.com/kohler-part-gm46362-pcb-assy-co-sensor.html

Also note that I believe the same fault code is thrown if one of your in cabin CO sensors is failing or not turned on. I remember troubleshooting the genset for an hour before realizing the CO sensor in the master stateroom was not powered on.