Q: 2009 Jeep Patriot check engine light on, no code on 2009 Jeep Patriot

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Do you need to turn the car on to get the code? Or can it register with just power on? I had someone put the diagnostic machine on to read the code, but he did not turn the engine over.
(1) Answer
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