the light will reset after 3 drive cycles.a drive cycle consists of driving the vehicle a ninimum distance of 15 miles then letting it cool down completely. so in 3 days the pcm will have ran all of the obd2 tests and when it sees it pass it will turn off the mil lamp.pcm=powertrain control module.mil=malfunction indicator lamp.
iv'e been a gm tech for 20 years.
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