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+--- Thread: Check engine light flashes for 20-30 seconds on startup (/showthread.php?tid=10785)
Check engine light flashes for 20-30 seconds on startup - Golfnut - 10-08-2026
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?
RE: Check engine light flashes for 20-30 seconds on startup - hookliftpete - 10-08-2026
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.
RE: Check engine light flashes for 20-30 seconds on startup - tree98 - 10-08-2026
Plug into it and see what it wants, we could sit around and guess like idiots for a year.
RE: Check engine light flashes for 20-30 seconds on startup - Golfnut - 10-08-2026
Thanks! The sensor was not plugged in. Cleaned it and connected it and everything works.