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Found the problem! The KT116 sensors don't play well with the truck. I changed to ADCelco 213-3521 sensors and the same new harness I used and everything cleared up within 40 miles. The job was much easier the second time, but still a pain! They ohmed out at 99.9 and 100.0 ohms, I didn't check them running. The tank of gas I ran with the knock sensors out of wack was just over 10 mpg! EEK! Timing advance under moderate acceleration with the bad sensors was around 4 to 8 degrees. With the ACDelco it was around 16 to 25 degrees. I am assuming that is quite a hit in power and efficiency. Noah

Same situation here... 2000 Yukon XL 5.3 I'll bullet what I've done.. -Got one of the standard knock sensor codes and CEL -Replaced both knock sensors and the wiring harness, properly cleaned and torqued etc. -BOTH pending codes P0327 and P0332 come up within a couple minutes of running after every time I reset them. (Yes, they are plugged in, it's the first thing I checked!! -CEL comes back on in about 15 miles with 2 warmup cycles -I have cleared the codes, and disconnected the battery to clear everything out, and they still come back. -99.7 Ohms at with truck off -109.9 Ohms with engine idling. Both sensors are within a tenth or two measured at the plug end of the new harness. Seems in an acceptable range or operation. Checked wiring back to harness, and roughly checked under the fuse box to make sure nothing has been living in there and feasting on my wires, it was clean. Any answers yet? ECM? Other way to check the sensors? I used the KT116 sensors, could this be the problem even though they seem to check out? Thanks!