2001 GMC Yukon Getting code P0332 and P0327.

Ok 332 is the rear sensor and 327 if front if harness is burnt heck connection of new harness and then after the connection check for burnt wires there as damage may have been done there as well as pcm. But if both codes are up it's normally a connection problem. However overtroqueing will cause them as well, set dvom to 400mV ac tap block with a hammer you should get a signal if not sensor may be bad. Knock sensors shold have torque of 20Nm or 15 ft lbs.

Your DMM has to be set at 400mvAC then tap on the block while attached to ground with one and ks with other as long as you get a signal that tells you the KS is goo if ohms are correct then it 's either a short to ground an open or a short to voltage which also could be poor connections at the pcm. The pcm because of wher they are located does get water intrusion and makes the pcm fail. But a pro should check this out. Because he will have to program it to your vehicle anyhow because of security issues. You have to tap on a metl area of block not plastic. As you have stated you replaced th ks harness it wold be between there and pcm if not the pcm itself