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I do not know anything about that as the ADLC connector has to conform with EPA/SAE pinouts and GM has always met those specs.
If 2 PCMs cannot link with a scanner or tuning tool the 1st place to be the cause can be no voltage on pin 16 or a wiring problem unless the fuses for the PCM are blown.
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JR
Custom GM Car/Truck Tuning
BBG - 239 MPH
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