what is that code for a 2004 gmc 5.3 z71.. 0327 and he says his four wheel drive isnt working properly either...does this code pertain to the problem?

 

anyone? please help!

 

P0327 - Knock Sensor 1 Circuit Low Voltage

 

ok i did a search before i posted and that is what the search yeilded also.. i just wanted to make sure the hypertech tuner didnt read codes differently, since his 4wheel drive wasnt working.. thanks. anyone else got any ideas? let me know thanks.