So recently I had my L33 on my Sierra 1500 5.3l gas engine rebuilt, prior to the rebuild I had no knock sensor codes, now after the rebuild the engine threw code P0332. Got that replaced and now it is throwing P0327! The mechanic had replaced both sensors after the P0332 code with Delphi Knock Sensors, used a gasket sealer per the tab and now I have the P0327 code. Could this be a bad knock sensor is the the pcm and/or wiring the issue? Any insight would be greatly appreciated.

 

Aftermarket knock sensors are usually garbage. Genuine GM is the only way to go.