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The 2003 Ions had a problem with the ignition switch in cold weather. The oils in the switch would thicken causing the ignition to fail to make proper contact. This would trigger the anti theft system and lock you out for a few minutes.

2004 Saturn ION 2.2 L. Ecotec Auto

Motor started missing, then it died, cranked but would not run. Did not think timing chain or BCM bad. Replaced plugs would not run, replaced ignition module, would not run, replaced coil pack, would not run. It fired good to the plugs. Finaly replaced Knock sensor located behind starter. Fixed Car and it Runs Better Than Ever. Aloways diconnect Negative Battery Terminal when working with electrical parts. Starter had to be removed to replace Knocker Sensor. After Battery rehooked back up it takes awhile for PCM to fuction 100 percent.

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Q: Why is the alarm light on in 2003 Saturn Ion but it won't start?
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