A friends Isuzu Trooper will get a check engine light if the gas cap is not securely tightened. It’s part of the whole EGR, etc system.
See #17
My 99 GMC suburban’s “service engine soon” light comes on whenever I remote start it. Just started doing this about three weeks ago, and my mechanic has no clue why.
Glad I got a code reader to clear it. Runs great otherwise.