Check engine light flashes for 20-30 seconds on startup

[Golfnut]

I have a 2014 T6 80 with an ISX 15 that has been put on a diet by a member of this forum. it has given me absolutely zero issues but starting this week, the check engine light with a wrench in the middle of it flashes for about 20 to 30 seconds every time I start the truck. It has never done this before I had the oil changed on it a month ago along with fuel filters and I do not recall the issue starting immediately after that this is a farm truck that does not see a lot of miles that sees a lot of hours and it is harvest season coolant level is fine. The truck does not get over 180 or 185 degrees. Thoughts?

[hookliftpete]

Kind of sounds like it might be telling you the fuel water sep is full? My pete flashes similar if the sep has water in it.

[tree98]

Plug into it and see what it wants, we could sit around and guess like idiots for a year.

[Golfnut]

Thanks! The sensor was not plugged in. Cleaned it and connected it and everything works.