Knock Sensor(s)

[L8RH8R]

I know some of this has been discussed previously, however, I have not found any solutions. Like several of the posts, I too have both knock sensors triggering a CEL. I have replaced these so many times I have it down to a science. I use only Delco sensors, and a new Delco harness each time. It's good for about 50-60 miles and the light is right back on. This last time, I checked for continuity in the old and new harnesses and all was good. I also checked the PCM for corrosion at the connection and all was good. The only thing I have not checked at this point is continuity in the harness from the PCM to the connector for the sensors. My belief is there may be an internal issue with the PCM. Any one experience the same issue? Anything I may be missing?

 

[DRLexpress]

Same here. Changed my sensors and harness and code was back immediately. Did notice something interesting though. My scanner at first said "P0327 low voltage" or low input, I can't remember for sure. After the new sensors it said "P0327 low frequency". I cleared and let it set several times to make sure. I don't ever remember seeing the "frequency" in the code before. I pulled the Blue connector off the PCM and it looked spotless. Sprayed it down good with contact cleaner anyway. Code has not come back after maybe 200 miles, knock on wood.

 

[L8RH8R]

Hmmm, I will give that a try.

Thank you

 

[Eric Thomas]

I know some of this has been discussed previously, however, I have not found any solutions. Like several of the posts, I too have both knock sensors triggering a CEL. I have replaced these so many times I have it down to a science. I use only Delco sensors, and a new Delco harness each time. It's good for about 50-60 miles and the light is right back on. This last time, I checked for continuity in the old and new harnesses and all was good. I also checked the PCM for corrosion at the connection and all was good. The only thing I have not checked at this point is continuity in the harness from the PCM to the connector for the sensors. My belief is there may be an internal issue with the PCM. Any one experience the same issue? Anything I may be missing?

Guy on tube called Matt's Shop, goes over all the grounds and others that cause electrical Gremlins. Worth checking out.

 

[Scottydoggs]

them dumb placed sensors have been deleted in my tune for 6 years now. funny they still work as per the scanner lol

 

[Doubeleive]

I seem to remember there being a thread on how to convert them to the external type like on the gmt900's???
might be worth a search
seems like it would just be a matter of adapting the harness

 

[Doubeleive]

https://www.silveradosierra.com/threads/relocate-knock-sensors.622154/

 

[L8RH8R]

I seem to remember there being a thread on how to convert them to the external type like on the gmt900's???
might be worth a search
seems like it would just be a matter of adapting the harneT

I actually did this; one was on the front of the passenger side head and the other on the bottom of the block driver side. This did not work either. Thank you for the response

 

[L8RH8R]

them dumb placed sensors have been deleted in my tune for 6 years now. funny they still work as per the scanner lol

This is my next course of action

 

[L8RH8R]

Guy on tube called Matt's Shop, goes over all the grounds and others that cause electrical Gremlins. Worth checking out.

I'm gonna check out his page. Thank you

 

[DRLexpress]

I now have these sitting on the shelf if mine sends the code again. Figured it was worth a try.

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