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P0329 Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.


The On-Board Diagnostics II (OBD-II) system used in contemporary automobiles has the Diagnostic Trouble Code (DTC) P0329. This particular error number refers to an issue with the Knock Sensor 1 Circuit (Bank 2).


The knock sensor circuit in Bank 2, which normally refers to the side of the engine without cylinder 1, has an issue, according to the P0329 code, which is generated by the engine control module (ECM). The function of the knock sensor is to recognize engine knocking or pinging, which may indicate atypical combustion. The knock sensor is not operating as intended when the ECM detects a circuit fault, which might result in issues with engine performance.


The P0329 error code may appear for several reasons, including:

  • Knock Sensor Error: A faulty knock sensor may produce inaccurate readings and set the error code.
  • Wiring Issues: Damaged or corroded wiring in the knock sensor circuit can result in poor electrical connections.
  • Loose or Corroded Connectors: Loose or corroded electrical connectors in the knock sensor circuit can disrupt the signal.
  • Engine Mechanical Problems: Engine issues, such as excessive carbon buildup or incorrect spark plug gaps, can cause false knock sensor readings.
  • Faulty ECM: In rare cases, a malfunctioning engine control module can produce erroneous P0329 codes.


One or more of the following may be among the P0329 code symptoms:

  • decreased engine power and performance.
  • Illumination of the dashboard’s Check Engine Light (CEL).
  • Possible engine pinging or banging sounds.
  • Fuel economy dropped.


To diagnose and confirm a P0329 code, a mechanic or technician will typically perform the following steps:

  • Use an OBD-II scanner to retrieve the trouble codes and freeze frame data.
  • Inspect the knock sensor and its wiring for physical damage or corrosion.
  • Check for loose or disconnected electrical connectors in the knock sensor circuit.
  • Test the knock sensor’s resistance and voltage output.
  • Inspect the engine for mechanical issues that could cause false knock sensor readings.
  • If necessary, test the ECM for faults using specialized diagnostic equipment.

Common mistakes

  • When handling a P0329 code, common errors include:
  • Replacing the knock sensor without first examining the connectors or wiring.
  • Ignoring probable banging engine reasons including carbon buildup or spark plug issues.
  • Unable to restart the car after repairs and clear the error code.

How serious is this?

The P0329 code can’t lead to immediate engine damage, so don’t ignore it. If there is a knocking or pinging, failure to check this code may lead to reduced engine performance, loss of fuel efficiency, and possible long-term engine damage. An immediate solution to this problem is recommended.

What repairs can fix the codeS?

repair manuals

Repairs to address a P0329 code may include:

  • Replacing the Knock Sensor: If the knock sensor is found to be faulty, it should be replaced with a new one.
  • Repairing or Replacing Wiring: If damaged or corroded wiring is identified, it should be repaired or replaced.
  • Addressing Engine Mechanical Issues: If engine mechanical problems are causing false knock sensor readings, they should be resolved.
  • Testing and Potentially Replacing the ECM: If all other possibilities are ruled out, testing and potentially replacing the engine control module may be necessary.

Related codes

Codes related to P0329 may include:

  • P0328: Knock Sensor 1 Circuit High Input (Bank 1)
  • P0330: Knock Sensor 2 Circuit Malfunction (Bank 2)


The P0329 DTC code relates to a problem with the Knock Sensor 1 Circuit (Bank 2). It indicates that a circuit-related issue with the knock sensor has been detected in the engine control module, which could lead to engine performance problems. To avoid further deterioration and restore the vehicle’s functionality, prompt diagnosis and repair are essential. This code should be addressed as soon as possible since it can result in lower fuel efficiency and the risk of engine damage.

P0329 Code – What Does It Mean & How To Fix It