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Cadillac Technician
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They probably suffered a programming failure. Battery voltage is critical and if they didn't have it charged up it may have fallen too low and caused irreperable damage to the PCM.
Sometimes you can recover from a programming failure, guess they can't.

We could sell you a PCM but it would have to be programmed and the theft learn done.
Your dealer "should" be able to handle it.
 
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