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According to Haynes Repair manual, fault code 12 (1 flash, pause, 2 flashes from check engine light) means 'Memory standby power lost'.

In other words, the battery has been disconnected recently. Not usually indicative of a problem, unless your battery hasn't been disconnected recently. Then you might want to look for a short between the battery and the engine control module.

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Q: What does a diagnostic code 12 on a dodge Dakota mean?
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