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Engine-Codes – Subaru – P0327 Subaru

P0327 Subaru Code - Knock Sensor 1 Circuit Low Input Bank 1 Or Single Sensor

Quick Answer

The P0327 code for Subaru vehicles indicates an issue with the knock sensor 1 circuit having a low input in bank 1 or a single sensor. Common causes include Faulty knock sensor, Damaged or corroded wiring connections, Issues with the ECM. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P0327 Subaru indicates Knock Sensor 1 Circuit Low Input Bank 1 Or Single Sensor.
Common causes
Common causes include Faulty knock sensor, Damaged or corroded wiring connections, Issues with the ECM.
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code P0327 Subaru Description

The P0327 code for Subaru vehicles indicates an issue with the knock sensor 1 circuit having a low input in bank 1 or a single sensor. The knock sensor is a crucial component that detects abnormal vibrations or knocking within the engine. When the sensor detects these vibrations, it sends a signal to the engine control module (ECM) to adjust the ignition timing to prevent engine damage. A low input signal can lead to improper ignition timing, which can result in reduced engine performance, decreased fuel efficiency, and potential engine damage if left unresolved. This code typically points to a malfunction in the knock sensor itself, wiring issues, or a problem with the ECM.

OBDII Code P0327 Subaru - Knock Sensor 1 Circuit Low Input Bank 1 Or Single Sensor
P0327 Subaru Code - Knock Sensor 1 Circuit Low Input Bank 1 Or Single Sensor

Common Causes of P0327 Subaru

  1. Faulty knock sensor
  2. Damaged or corroded wiring connections
  3. Issues with the ECM
  4. Engine overheating
  5. Poor quality fuel

Symptoms of P0327 Subaru

  1. Engine knocking or pinging noises
  2. Decreased engine performance or acceleration
  3. Poor fuel economy
  4. Check Engine Light illuminated
  5. Engine misfires

How to Fix P0327 Subaru

  1. Begin by diagnosing the specific cause of the low input signal, which may involve testing the knock sensor, checking wiring connections, and inspecting the ECM.
  2. Replace the knock sensor if it is found to be faulty. This typically involves locating the sensor, disconnecting the electrical connector, removing the sensor, and installing a new one.
  3. Repair or replace any damaged wiring connections related to the knock sensor circuit.
  4. If the issue lies with the ECM, it may need to be reprogrammed or replaced by a qualified technician.
  5. Clear the diagnostic trouble codes from the ECM and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0327 Subaru

The cost of repairing a P0327 code for a Subaru vehicle can vary depending on the specific cause of the issue and the labor rates in your area. On average, the cost of replacing a knock sensor ranges from $150 to $300, including parts and labor. If additional repairs or replacements are needed, the total cost could increase. It's recommended to consult with a trusted mechanic or dealership to get an accurate estimate based on your vehicle's make and model.

What does this mean?

Tech Notes for P0327 Subaru

The P0327 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.

When is the Code Detected?

An excessively low voltage from the sensor is sent to Engine Control Module (ECM)

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0327 Subaru Code

1. What are the common symptoms of OBDII code P0327 in a Subaru?

- Common symptoms include engine knocking noises, reduced engine performance, and possibly an illuminated check engine light on the dashboard.

2. What causes the OBDII code P0327 in a Subaru?

- The code P0327 typically indicates a low input signal from the knock sensor 1 located in Bank 1 or a single sensor in the Subaru's engine.

3. How serious is the OBDII code P0327 in a Subaru?

- Ignoring the P0327 code can lead to potential engine damage over time due to inefficient engine performance and knock sensor issues. It is recommended to address this code promptly.

4. Can driving with the OBDII code P0327 in a Subaru cause further damage?

- Continuing to drive with the P0327 code can potentially lead to decreased fuel efficiency, engine misfires, and long-term engine damage if left unresolved.

5. How can I diagnose the OBDII code P0327 in my Subaru?

- Diagnosing the P0327 code involves using a scan tool to retrieve the code, checking the knock sensor's wiring and connections, and testing the sensor's resistance for proper functionality.

6. What are some possible repair tips for OBDII code P0327 in a Subaru?

- Repair tips may include inspecting and repairing damaged wiring, replacing the knock sensor, and clearing the code to see if the issue persists after repairs.

7. Is it possible to reset the OBDII code P0327 in a Subaru without fixing the underlying issue?

- While you can clear the code with an OBDII scan tool, it is not recommended to reset the code without addressing the underlying problem, as it may lead to further issues down the line.

8. How much does it typically cost to repair the OBDII code P0327 in a Subaru?

- The cost of repairing the P0327 code can vary depending on the specific issue, but it may involve costs for parts such as a new knock sensor and labor for installation.

9. Can a DIY enthusiast fix the OBDII code P0327 in a Subaru?

- Depending on your skill level and access to tools, DIY enthusiasts may be able to tackle the repair for the P0327 code by following online guides and tutorials. However, if unsure, it's best to consult a professional mechanic.

10. How often does the OBDII code P0327 reoccur in Subaru vehicles after repair?

- After proper diagnosis and repair of the P0327 code, it should not reoccur if the underlying issue has been successfully resolved. Regular maintenance can help avoid future occurrences.

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