Knock Sensor Issues
 

Looking for some expertise on a knock sensor issue (code P0327) on a 2011 6.0L 2500 Express. I replaced both sensors. The code went away and 3days later it's back on. I've checked the wiring and didn't see any problems.
Does anyone have any suggestions on what else i need to be looking for?
Thanks

P0327 is low signal

knock sensor needs a solid ground.
the signal needs to reach the PCM. Test by probing.
If those conditions are met and you still get the code, then the PCM may be damaged.

https://us.autologic.com/news/piezoe...-knock-sensors

Knock sensors
 

Thank you mountainmanjoe
i will do a grounding check. Is there a way to check the PCM ? Is the PCM and ECM one of the same or are they different?

ECM = Engine Control Module
PCM = Powertrain Control Module = ECM + integrated transmission controller

If the the knock signal looks good when probed at the PCM and you still get the code, then PCM is bad.

Make sure your battery + alternator are in good shape and the engine ground strap too.