Hi my name is Dan.
Generally a knock sensor circuit is entirely separate from any other circuits to avoid noise in the system. The circuit usually runs on a 2.5 volt supply due to the impedance of the sensor.
Hyundai does have a software update for the 2015 2.4 which concerns the knock sensor. I've attached the bulletin.
Also, Hyundai's test procedure for the knock sensor is to substitute a known good sensor to test if the code is fixed.
Images (Click to enlarge)
Thursday, July 22nd, 2021 AT 12:09 PM