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The code P1684 on a 2002 PT Cruiser indicates that there is a problem with the battery or the battery-related systems, specifically that the battery voltage was too low for the Engine Control Module (ECM) to function properly. This can occur due to a weak battery, poor battery connections, or an issue with the charging system. It’s advisable to check the battery and its connections, and ensure the alternator is working correctly to prevent further issues.

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