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Code 12 is a diagnostic code. It sounds like there is a short between pins A and B on the ALDL connector, covered by a small, rectangular black cover, probably just above the driver's right knee. Shorting those pins puts the ECM in that mode.

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Q: 1985 corvette and the trouble code 12 stays flashing with the car running or the car off but key on what is no reference pulses to Ecm?
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