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Q: Engine light on indicating #2 cylinder misfiring:consider what is shared below. on 2005 Saturn Ion

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Changed coil pack, plugs, ignition module and problem remains.
Removed coil pack and removed plugs...they each look the same, the "boots" and inner springs look clean as well as the plugs...the plugs each look the same...looked at the pins on the electrical connector to the ICM and there is no oxidation. It appears the ECM is not getting the confirmation signal that #2 cylinder is firing...What else do I consider except the ECM.
check compression which is the first thing that should have been done before throwing all those parts at it. if it is ok, you need to have the injector checked and also look for any vacuum leaks.

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