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I just had this issue last week. Car turned on and immediately entered limp mode, CEL came on, and the radiator started going at full speed. Once I got it home and restarted it didn't enter limp mode and the radiator ran normal, but CEL remained on. Dealer said the code was P1098, and according...

One more thought to this. Besides the frustration of ECNS, has there been any long term effects of this noticed? I.e. Is the ECNS a precursor to something worse to come? So far I've read no instances of something worse happening, just an annoying intermittent issue.

Glad I found this forum, I've been feeling like i'm taking crazy pills dealing with this issue. I have a '21 GMC LM2, extremely intermittent ECNS issue (less than 10x since purchasing the truck new). I had a coolant flow control valve go bad recently and just got the truck back. According to...