Code P0325 (Symptoms, Causes and How)


The last thing you want to see while driving down the road is the lone control engine. But when it happens, you need to quickly understand what’s happening to make sure you’re not going to cause more harm by ignoring it.

If after using your OBD2 scanner you discover that you have a P0325 engine code, this is exactly what can happen if you continue driving.

But before your heart pounds out of your chest, read on to find out exactly what is causing the engine code. Because, even if it is a serious condition, it is usually quite easy to solve.

What does the P0325 code mean?

P0325 OBD-II Trouble Code Description

Knock sensor malfunction (sensor 1 or bank 1)

When you have a P0325 code, it means that your engine control module (ECM) is receiving knock sensor readings that are outside the normal range.

While the problem could be with the motor itself, there is usually a problem with the circuit or sensor, causing an erroneous reading.

Either way, as long as the code is present, your ECM will reset to a default value and you can continue driving your vehicle with visible symptoms.

Related: code P0327, code P0332

Code P0325 Symptoms

fat noise

While you will still have a check engine light with a P0325 code, engine noise is also common. Below, we highlight the four most common symptoms of a P0325 code to help you diagnose the problem and keep your vehicle running like new.

#1 – Check Engine Light

While it may seem like a check engine light is not necessary to indicate an engine code, sometimes it is the only visible sign.

Although rare, it is not uncommon for a distracted driver to notice any of the other symptoms along with an illuminated Check Engine Light on their dashboard.

#2 – Noise when accelerating

When your vehicle has a knock detection code, it will automatically return to default values. While this helps protect the engine from further damage, it wastes a bit of time. This delay is especially noticeable when accelerating.

If you’re listening, you’ll probably hear a click when you sharpen. The longer you leave this problem unresolved, the louder the sound will be.

#3 – Excessive noise when running

Although the noise is most common during acceleration, the noises can be heard when the engine is running. This is especially true if you have a P0325 code due to an underlying engine condition rather than a faulty knock sensor.

If you hear an unusual engine noise and the engine is revving, it is essential that you get your vehicle serviced as soon as possible. Failure to do so can cause more damage to your engine.

#4 – Reduced engine performance

When your engine fails at presets, one of the first things you should look at is the performance of the engine. You will experience a significant reduction in your ability to accelerate, but you will also experience a drop in fuel economy.

While this may be a bad thing, it gives you more time to get your vehicle to a repair shop before more damage occurs.

Causes of code P0325

Bad Knock Sensor Symptoms

While the most common cause of a P0325 code is a faulty knock sensor, it’s not the only thing that can cause you problems. Below we highlight the four most common causes of a P0325 code that you should check before attempting to replace parts.

#1 – Faulty knock sensor

The most common symptom of a P0325 engine code is a faulty knock sensor. When the check engine is turned on, the ECM defaults to standard values, so engine performance decreases and may cause engine noise.

#2 – Wiring problems

It does not matter if the sensor is working properly if there is excessive corrosion or broken wires. It’s not uncommon for a mechanic to spend a few days driving around like crazy trying to figure out what happens when there is a wiring problem.

#3 – Faulty EGR system

Your EGR system isn’t just about emissions, it also optimizes your engine’s performance. But when things aren’t working as they should, it’s not uncommon for the engine to start making noises it shouldn’t.

When this happens, it may result in a P0325 code. The sensor is working as it should – your engine is just making noises it shouldn’t.

#4 – Redundant Knock Mary Engine

Just as a faulty EGR system can cause an engine knock, there are many conditions that can cause excessive engine noise. Broken components, an out-of-time engine, and compression leaks are just a few of the problems that can arise.

However, keep in mind that the P0325 code usually only appears when the readings are not far from normal. Therefore, a small knock on the engine will generally not cause this code.

Is code P0325 serious?

The P0325 code is a very serious engine code. If you leave a P0325 engine code unrepaired and continue driving your vehicle, the problem will worsen. Additionally, you can expect the code to negatively impact the vehicle’s performance.

This means that even if you are lucky and the damage doesn’t get worse immediately, you could still end up in an accident because your vehicle is not performing the way you are used to.

If you have a P0325 code, don’t hesitate to take it to the shop, you just want bigger problems.

How to fix

knock sensor test

While the only sure way to replace the right part the first time is to plug in an automotive scan tool and see exactly what’s going on, if you want to take the risk and save a few bucks, you can give it a try. sensor and I hope that is the problem.

However, if not, you will need to initiate further troubleshooting. Check the wiring again and use a multimeter to determine if you have too much resistance in the circuit and make sure you have power when you’re supposed to.

If you still can’t find the cause of the problem, you may need to take it to a mechanic. They will be able to turn off all appropriate diagnostic equipment to better see what is happening inside your engine.



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