What is OBD-II Code P0327 – Knock/Combustion Vibration Sensor A Circuit Low



What is OBD-II Code P0327 – Knock/Combustion Vibration Sensor A Circuit Low

If your car’s check engine light is on and you scan it with an OBD-II scanner, the code P0327 might show up. This code refers to a fault in the knock or combustion vibration sensor A circuit in your engine. This fault can affect your car’s performance, fuel efficiency, and even damage your engine over time. In this article, we will explain in detail what this code means, its causes, symptoms, and possible fixes.

What is OBD-II Code P0327?

Code P0327 is an OBD-II trouble code that indicates a fault in the knock or combustion vibration sensor A circuit on your car’s engine. This sensor is responsible for detecting vibrations or knock in the engine to adjust the ignition timing and maintain optimal performance. When there is a fault in this circuit, your car’s computer can’t get accurate readings of engine vibration, and the engine may start to malfunction.

Causes of Code P0327

There are several causes of the P0327 code, including:

1. Faulty knock sensor: Over time, the knock sensor can become damaged or faulty due to wear and tear, leading to low voltage output.

2. Wiring problems: Loose connections, corrosion or damaged wiring between the knock sensor and the engine control module (ECM) can cause the circuit to malfunction.

3. Failed engine control module: if your car’s ECM is faulty or damaged, it can’t receive accurate information from the knock sensor, which can cause the code P0327.

4. Damaged engine components: If your engine’s pistons, bearings, or other components are damaged, they can cause excessive vibrations or knock, leading to the code P0327.

Symptoms of Code P0327

When your car’s computer detects a fault in the knock or combustion vibration sensor A circuit, it will trigger the check engine light to come on. Other symptoms may include:

1. Engine misfires: Misfires can occur when the engine doesn’t get accurate feedback from the knock sensor, leading to the incorrect ignition timing.

2. Decreased performance and fuel efficiency: When the knock sensor doesn’t work correctly, the engine may not run efficiently, reducing fuel economy and power delivery.

3. Rough idling: A faulty knock sensor can cause your engine to run rough at idle, making strange noises, and causing vibrations.

4. Stalling: In some cases, the engine may stall, making it difficult or impossible to start again if the knock sensor malfunctions.

How to Fix Code P0327

Fixing code P0327 depends on the cause of the problem. In some cases, fixing the wiring can solve the issue. You can start by checking the wiring between the knock sensor and ECM for loose or corroded connections. Repairing or replacing damaged wires can also help solve the problem. If the knock sensor is faulty, replacing it may solve the issue. If the engine control module (ECM) is faulty, you may need to replace it or reprogram it with the correct software to fix the problem. In some cases, the engine components such as the pistons, bearings or valves may also need to be inspected and repaired or replaced.

Frequently Asked Questions (FAQs)

1. Can a bad knock sensor damage the engine?
Yes. A bad knock sensor can cause engine damage as it can’t detect vibrations or knock in the engine, leading to incorrect ignition timing, which can damage engine components over time.

2. Can I still drive my car with P0327 code?
It is not recommended to drive your car with the P0327 code. Continuing to drive with this code can cause significant damage to your engine.

3. How much does it cost to fix code P0327?
The cost of fixing code P0327 depends on the cause of the problem, including the cost of parts and labor. Repairing or replacing the knock sensor can cost between $100 and $200, while replacing the engine control module (ECM) can cost up to $800.

4. Can I reset the code P0327 myself?
Yes, you can reset the code P0327 by disconnecting the battery for about 15 minutes, but you will need to repair the underlying problem to prevent the code from returning.

5. How often should I replace the knock sensor?
The knock sensor doesn’t have a set replacement interval. It should be replaced when it becomes faulty or damaged, leading to rough idle, decreased performance, or a drop in fuel efficiency.

In conclusion, code P0327 indicates a problem with the knock or combustion vibration sensor A circuit on your car’s engine. If you notice the check engine light on with this code or other symptoms, you should have it checked by a professional mechanic to avoid damaging your engine. By following the tips mentioned above, you can diagnose and fix the problem before it becomes worse. If you have further questions, you can consult a professional mechanic or use online resources for more information.

Scroll to Top