A/C compressor won't stop running
 

My A/C compressor gets power to run no matter what I do. If I turn it off or even pull the relay, it still runs. The only way to get the compressor to shut off is to unplug it. I'm also having knock sensor issues, could it be the PCM?

Since the PCM turns the relay off and on and pulling it doesn't stop the compressor, not the PCM causing this issue. More info on the vehicle would help.

2005 GTO, LS2. Ported heads and cam. I just put this compressor on used, it's off a 2004 GTO.

I'm also having knock sensor issues, thought the pcm might be bad