MasterTuning Fault code dictionary (DTC)

P0325 — Knock Sensor 1 Circuit Malfunction

Severity: Warning Can you drive? With caution: limp mode possible, have it checked soon Make: All makes (OBD-II standard)
MeaningThe engine control unit has detected an electrical fault or no signal coming from the knock sensor on cylinder bank 1. This sensor acts like a microphone to listen for abnormal engine combustion, commonly known as detonation or pinging, so the computer can adjust ignition timing to protect internal parts.
FamilyPowertrain (P)

Typical symptoms

The check engine light is illuminated on the dashboard
The engine may feel sluggish or lack normal responsiveness
You might hear a pinging or rattling noise from the engine under acceleration

Common causes

Damaged, corroded, or disconnected wiring and connector at the knock sensor
A faulty knock sensor internal failure
Improper torque on the knock sensor mounting bolt during a previous repair
An internal engine mechanical issue causing excessive vibration

What to do

Have a technician inspect the wiring harness and connector leading to the knock sensor first, as heat and vibration often damage them in that area. It is best to address this soon, because without this sensor, the engine cannot properly protect itself from harmful combustion knock.

Frequently asked questions

What does code P0325 mean?

Knock Sensor 1 Circuit Malfunction. The engine control unit has detected an electrical fault or no signal coming from the knock sensor on cylinder bank 1. This sensor acts like a microphone to listen for abnormal engine combustion, commonly known as detonation or pinging, so the computer can adjust ignition timing to protect internal parts.

Can I keep driving with code P0325 active?

With caution: limp mode possible, have it checked soon

Common causes — P0325

Damaged, corroded, or disconnected wiring and connector at the knock sensor A faulty knock sensor internal failure Improper torque on the knock sensor mounting bolt during a previous repair An internal engine mechanical issue causing excessive vibration

How do you fix code P0325?

Have a technician inspect the wiring harness and connector leading to the knock sensor first, as heat and vibration often damage them in that area. It is best to address this soon, because without this sensor, the engine cannot properly protect itself from harmful combustion knock.

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