Long story short.Replaced both knock sensors.still bad code on rear sensor.so i replaced wiring harness to the sensors.still bad code.checked ohms in the sensors and they are in the specified area.so now what??????how else can i test this?The truck is a 2003 2500hd silverado with the 6.0L.any help???

 

did you delet the code from your computers history
if not it will keep coming back
i think you can still do this with yours
disconect your negative battery terminal for a couple seconds or even a minute
then reconnect it that should remove the code
if not your gonna have to get a code reader and go into the computer and erase the code

 

also did you disconnect battery before connecting any electrical equipment?

some people say its not needed but if im even changing a bulb i ALWAYS unplug my battery just so i dont cause a short or mess up any sensitive electrical equipment

 

and do what cup says

thats what you will always have to do because it stores that code until its erased

 

yeah...i delete the code all the time with my reader,but comes back.i will also try disconnecting the battery

 

What code are you getting exactly ...?

Would it be possible that you're knock sensor is actually reading .... knock?!

Make sure your timing is correct. It's possible some pre-detonation is what's actually making your code show up.