What the P0325 code means

What the P0325 code means


P0325 is a general ODB2 diagnostic trouble code associated with the knock sensor circuit. This code may be seen with other knock sensor codes and lean condition codes.

P0325 means that there is a malfunction within the knock sensor 1 in-circuit bank 1. This malfunction will be detected by the ECU when it does not receive the proper information from the knock sensor. This triggers a Check Engine Light to be illuminated on the dashboard.

What can cause a P0325 code?

Code P0325 means that your car computer detects a problem with the knock sensor unit or its circuit. The knock sensor detects the vibrations from abnormal combustion, known as spark knock. A car can have one or two knock sensors depending on its make and model.

What are the symptoms of the P0325 code?


The most common symptom of the P0325 code is a check engine light. Other symptoms may include a knocking noise from the engine, poor fuel economy, and reduced power. If you experience any of these symptoms, have your car checked by a qualified technician as soon as possible. Left unchecked, this code can lead to serious engine damage.

How serious is the P0325 code?

The P0325 is a serious code and can indicate a problem with your engine. If you see this code, it is important to get your vehicle to a mechanic as soon as possible. This code can indicate a problem with the engine's knock sensor, which can lead to engine damage if not fixed.

What's a knock sensor?


The engine's knock sensor (or sensors) detects preignition and detonation, potentially damaging forms of abnormal combustion. Though full-blown knocking and pinging are audible to the human ear, the knock sensor detects imperceptible levels.

The knock sensor's output signal is fed to the engine control unit (ECU), which can take action to prevent knocking. Such action might include retarding the ignition timing or, in some cases, cutting off the fuel supply to one or more cylinders.

While knock sensors are designed to be durable and long-lasting, they can fail over time. When this happens, the ECU will not be able to properly adjust the engine's ignition timing, potentially leading to knocking and pinging. A failed knock sensor can also cause engine misfires and a loss of power.

Where is a knock sensor located?


The knock sensor is located on the engine block, cylinder head, or intake manifold. It produces a signal that is used by the engine control unit (ECU) to adjust ignition timing and prevent engine damage. A knock sensor is usually a piezoelectric sensor that produces a voltage when it is vibrated by knocking.


Will the knock sensor cause a check engine light?

The most common sign of a bad knock sensor is an illuminated check engine light. When the PCM detects a problem with the knock sensor or its circuit, the module will turn on the check engine light and store a corresponding diagnostic trouble code (DTC) in its memory.

Can a knock sensor cause transmission problems?

A malfunctioning knock sensor can cause transmission problems because it doesn't relay the right time for the engine to fire the spark plugs. This causes a power loss and that can cause the transmission to use a different gear than it normally would compensate.

How much is a knock sensor?

The average cost for knock sensor replacement is between $297 and $381. Labor costs are estimated between $186 and $235 while parts are priced between $111 and $146. This range does not include taxes and fees and does not factor in your specific vehicle or unique location.

How do I fix the knock control error?

Everything in your car must work perfectly and smoothly. And if any, even the most insignificant failure is shown on the dashboard - it must be eliminated as soon as possible. When you see code p0325, it may indicate some problems with the ignition system. And even if you don't notice any problems with it at the moment, don't hesitate! Fix the problem as soon as possible. Below we have listed the most common ways to fix the p0325 code, you can try to do it yourself. But if you don't think you're competent enough, or you're not sure exactly what's causing the error - contact a qualified mechanic - he'll definitely find the problem and fix it quickly and efficiently!

What repairs can fix the P0325 code?

  • Replacing the ECU
  • Addressing a knocking, pinging, or misfiring engine issue.
  • Replacing the knock sensor.
  • Repairing a poor electrical connection to the knock sensor's circuit.
  • Replacing the wiring harness for the knock sensor.
  • Replacing or reprogramming the PCM (rare)