Mercruiser 5.0 mpi catalyst - Beeps/1 minute but no code

[searay205]

Hope someone has an idea. I have a 2011 mercruiser 5.0 mpi. Runs perfect but I get a single beep every minute. I checked with my Rinda Tool and it shows NO alarms!!! Everything from cooling temp to oil pressure looks great.

One thing my IAC valve shows to be open even off idle. Is that normal? I thought off idle it would be zero.

Worst comes to worst i disconnect the horn. I know the outdrive is tight, lube oil level good, water pump good. Last boat i had didn't have an alarm for 30 years and never missed it!!

 

[OllieC]

Just spitballing, but I had a beep every minute or so & thought it was the engine. Turns out it was my CO detector failing.

 

[searay205]

Appreciate response but my 205 doesn’t have one. Got on iboats. Haven’t cked yet but loose connection, weak battery, or corroded ground can cause. Sometimes IAC can also cause without setting code. Next time I go out I will do a once over. Worst case scenario I in plug the siren.