P0328 – Knock Sensor 1 Circuit high Input (Bank 1 or Single Sensor)

Meaning:

When the knock sensor on bank 1 has higher output voltage than normal, the P0328 happens
The P0328 is triggered when the knock sensor on bank 1 has higher output voltage than normal

Knock sensor on bank 1 is has higher output voltage than normal; usually .5V or less.

Main Symptoms:

  • Check Engine Light comes on
  • Loss of power
  • Irregular RPM
  • Engine pings when accelerating
  • Knocking sound coming from engine compartment

Possible Causes:

  • Knock sensor 1 in circuit 1 may be faulty
  • Open or short in wiring to the sensor
  • Low fuel pressure
  • Loose knock sensor
  • Using incorrect type of fuel
  • PCM has failed (least likely)

Diagnostic Steps:

  • Ensure the correct fuel was used
  • Visually inspect all wiring to knock sensor 1 in circuit bank 1. Ensure there are no shorts or open wires
  • Measure resistance of the sensor. If it doesn’t match manufacturer specs replace the sensor

Read More: OBD2 Codes List: Meaning, Fixes, and Free Download