For Shop Owners

P0325 GMC - Knock Sensor Circuit Malfunction

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3 What does this mean?
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Possible causes

  • Faulty knock sensor
  • Knock sensor circuit poor electrical connection
  • Knock sensor harness is open or shorted
  • Faulty Powertrain Control System (PCM)
What does this mean?

Tech notes

The P0325 code means that the Knock Sensor is not working properly. Problems with the knock sensor will not cause an engine performance problems. Replacing the knock sensor usually takes care of the problem.
What does this mean?

When is the code detected?

When the Knock Sensor (KS) system is malfunctioning, the KS circuit voltage going to the Powertrain Control System (PCM) goes low. The PCM interprets this low signal as spark knock and will set the P0325 code.

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Possible Lack/Loss of Power

P0325 GMC Description

The Knock Sensor (KS) senses engine knocking (also known as detonation or pinging) using a piezoelectric element. The sensor is attached to the cylinder block, cylinder head or intake manifold. A knocking vibration from the cylinder block is sensed as vibrational pressure. This pressure is converted into a voltage signal and sent to the Powertrain Control Module (PCM). The PCM uses this signal to retard the ignition timing and protect the engine from this damaging pre-ignition.
OBDII Code P0325 Gmc - Knock Sensor Circuit Malfunction -

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P0325 GMC Comments

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Repair Importance Level: 2
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Repair Difficulty Level: 2
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Posted and Edit by 04-16-2017

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