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12 is direct battery input to PCM was disconnected within the last 50-100 key on cycles. Code 41 is an open or shorted condition in the generator field control circuit. Occurs when the battery voltage from the ASD relay is below 11.75 volts. Code 55 simply means end of codes.

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Q: What is diagnostic code 12 41 55 in a 1995 jeep grand Cherokee?
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