DTC P0327 Knock Sensor 1 Circuit Low Input

In the realm of automotive troubleshooting, deciphering On-Board Diagnostic Trouble Codes (DTCs) is crucial. Today, we’ll shed light on DTC P0327, specifically the Knock Sensor 1 Circuit Low Input issue. In this informative guide, we will unravel the meaning of P0327, explore its symptoms, delve into potential causes, discuss diagnosis methods, and provide effective solutions to fix this trouble code. Let’s dive in.

1. What does P0327 code mean?

DTC P0327 is a diagnostic trouble code that signifies a low input signal from Knock Sensor 1. The knock sensor’s primary role is to detect abnormal engine vibrations or knocking. When it senses a low input signal, the Engine Control Module (ECM) triggers the P0327 code, indicating a problem with the sensor or its circuit.

2. What are the causes of DTC P0327?

Understanding the potential causes of DTC P0327 is fundamental to effective troubleshooting. These causes may include:

  • A malfunctioning knock sensor.
  • Damaged or frayed wiring in the knock sensor circuit.
  • Loose or corroded electrical connections.
  • Engine mechanical issues, such as excessive carbon buildup.

Identifying the root cause is the initial step in resolving this problem.

3. What are the symptoms of DTC P0327?

Recognizing the symptoms associated with DTC P0327 is essential for early detection. Common signs of this issue include:

  • Reduced engine performance.
  • Poor fuel efficiency.
  • An illuminated check engine light (CEL) on the dashboard.
  • Abnormal engine knocking or pinging sounds.

If you notice any of these symptoms, it’s crucial to address the problem promptly to prevent further damage.

4. How to diagnose DTC P0327?

Accurate diagnosis of DTC P0327 necessitates a systematic approach. Here’s a step-by-step guide:

5. How to fix DTC P0327 problem?

Once you’ve identified the issue causing DTC P0327, it’s time to address it effectively. Here are some steps to consider:

  • Replace a faulty knock sensor if necessary.
  • Repair or replace damaged wiring and connectors in the knock sensor circuit.
  • Address any underlying engine mechanical issues, such as excessive carbon buildup.
  • Clear the trouble code using your OBD-II scanner after completing repairs.

Resolving these issues and clearing the trouble code will help restore your vehicle’s performance and efficiency.


In this comprehensive guide, we’ve explored DTC P0327, the Knock Sensor 1 Circuit Low Input code. Understanding its meaning, symptoms, potential causes, diagnosis, and the importance of clearing the trouble code empowers you to tackle this issue confidently. Whether you’re an automotive enthusiast or a professional mechanic, addressing these problems with precision and expertise not only enhances your vehicle’s performance but also boosts your automotive knowledge. Safe and smooth travels!