Code P0326

BOB SHULTZ

MEMBER
2015 HYUNDAI SONATA
2.4L
4 CYL
2WD
AUTOMATIC
70,000 MILES

I had a few codes pop up. One was the knock sensor. Replaced and okay for about a month. Next code popped up for fuel pressure. I reach into look at the pump and a bolt was loose and the other broken. Removed the pump and the plunger was broke. Replaced and tapped striped out socket. Pressure is good at 2400 lbs average and code is gone. Keep getting code for Knock Sensor again. I checked checked for continuity between the ECM pin 63 to the socket that plugs into the knock sensor. Good to go with no shorts. Checking the voltage from the ECM to the socket I'm only getting 1 volt. Thinking this should be 5 volts. Is that correct? What do you think my next step should be? Could the ECM be bad? Thanks!

1 Reply

MASTER ASE TECH

MEMBER
82 POSTS

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.

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