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What does Error Code P0325 mean?

Moderate Issue
DTC Code P0325 indicates a malfunction in the Knock Sensor Circuit Bank 1, where the Engine Control Module (ECM) detects an open signal circuit for more than 5 seconds. This affects the ECM's ability to adjust ignition timing to prevent engine detonation.

What are the symptoms of Error Code P0325?

  • Engine Light ON: The check engine light or service engine soon warning light illuminates, indicating a potential issue with the knock sensor circuit on Bank 1.
  • Engine Lack / Loss of Power: The vehicle may experience a noticeable reduction in power output, which can be linked to the knock sensor's inability to detect engine knock accurately, potentially affecting engine performance.

What causes Error Code P0325?

  • The knock sensor on Bank 1 may be malfunctioning, leading to incorrect readings and triggering the error code.
  • Poor electrical connections in the knock sensor circuit can cause intermittent signals, resulting in the error code.
  • An open or shorted harness in the knock sensor circuit can disrupt communication, causing the error code to appear.
  • A faulty Engine Control Module (ECM) can misinterpret signals from the knock sensor, leading to the error code.
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How to fix Error Code P0325?

  • Verify DTC Code: Confirm the presence of DTC P0325 using an OBD-II scanner. Ensure no other related codes are present.
  • Inspect Knock Sensor Wiring: Check the wiring and connectors for the knock sensor on Bank 1 for any signs of damage, corrosion, or disconnection.
  • Test Knock Sensor: Use a multimeter to measure the resistance of the knock sensor. Compare the readings with the manufacturer's specifications to determine if the sensor is faulty.
  • Check ECM/PCM: Inspect the Engine Control Module (ECM) or Powertrain Control Module (PCM) for any issues that might affect the knock sensor circuit.
  • Replace Knock Sensor: If the knock sensor is confirmed faulty, replace it with a new one. Ensure the new sensor is properly installed and connected.
  • Clear DTC and Test Drive: Clear the DTC code using the OBD-II scanner and perform a test drive to ensure the issue is resolved and the code does not return.
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