P0327 – Knock Sensor 1 Circuit low Input (Bank 1 or Single Sensor)

Meaning:

When the knock sensor on bank 1 has lower output voltage than normal, the P0327 happens
The P0327 is triggered when the knock sensor on bank 1 has lower output voltage than normal

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

Main Symptoms:

  • Generally doesn’t come with symptoms but Check Engine Light may come on
  • You may also notice fluctuating RPM and loss of engine power

Possible Causes:

  • Sensor in circuit bank 1 may be faulty
  • Open or short in wiring to the sensor
  • PCM has failed (least likely)

Diagnostic Steps:

  • Check the resistance of the knock sensor and ensure it matches manufacturer’s specifications
  • Visually inspect all wiring to knock sensor 1 in circuit bank 1. Ensure there are no shorts or open wires
  • If the above don’t work replace knock sensor

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