2021 trailblazer rs check engine light suddenly came on. help.

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my trailblazer journey had been smooth-sailing for almost 5 years when i encountered the first ever issue: the check engine light suddenly lit.

i was celebrating hitting 30k miles when this happened. i have a hunch its due to the emission control system but im not sure yet. just wanted to check for your thoughts before i head over to the mechanic.

thanks.