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P0324 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.


P0324 is a Diagnostic Trouble Code (DTC) within the On-Board Diagnostics II (OBD-II) system used in modern vehicles. This code specifically relates to a problem with the Knock Control System Error (Circuit Range/Performance).


The P0324 code says that the engine control module ECM has encountered an issue with a knock check circuit, especially in terms of range or performance. The knock control system will detect the knocking and pinging of engines, which may indicate irregular combustion. When the circuit is detected as a malfunction by the ECM, it indicates that the knock control unit does not function within the expected range or performance parameters, which may lead to engine failure.


Several factors can trigger the P0324 code, including:

  • Faulty Knock Sensor: A malfunctioning or damaged knock sensor can lead to incorrect circuit readings.
  • Wiring Issues: Damaged or corroded wiring in the knock control circuit can result in poor electrical connections.
  • Loose or Corroded Connectors: Loose or corroded electrical connectors in the knock control 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 P0324 codes.


The symptoms associated with a P0324 code may include:

  • Reduced engine performance and power.
  • Illumination of the Check Engine Light (CEL) on the dashboard.
  • Potential engine knocking or pinging noises.
  • Decreased fuel efficiency.


To diagnose and confirm a P0324 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 control 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 P0324 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?

While the code P0324 may not result in immediately damaged engines, it should not be ignored. If a knock or pinging occurs, ignoring the code may lead to reduced engine performance, a decrease in fuel efficiency, and potential long-term engine damage. The issue is recommended to be dealt with promptly.

What repairs can fix the codeS?

repair manuals

Repairs to address a P0324 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 P0324 may include:

  • P0323: Knock Sensor Circuit, High Input
  • P0325: Knock Sensor Circuit Malfunction


The P0324 DTC code relates to a problem with the Knock Control System Error (Circuit Range/Performance). It signifies that the engine control module has detected a circuit-related issue with the knock control system, potentially leading to engine performance problems.

To prevent further injury and restore the vehicle’s performance, prompt diagnosis and repairs are essential. Ignoring this code can lead to reduced fuel efficiency and potential engine damage, so it’s advisable to address it as soon as possible.

P0324 Code – What Does It Mean & How To Fix It