P0328 Fault Code

Knock Sensor 1 Circuit High Input (Bank 2 or Single Sensor)

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0328 fault code indicates a problem with the knock sensor circuit. Specifically, it points to a high input from Knock Sensor 1, which is either located on Bank 2 of the engine or could pertain to a single sensor installation. This sensor plays a crucial role in detecting engine knock or detonation, enabling the engine control module (ECM) to adjust ignition timing and maintain optimal engine performance. If the sensor malfunctions or if there are issues with the wiring, it can lead to improper engine tuning, affecting efficiency and performance.

What are the symptoms of the P0328 code?

Symptoms associated with the P0328 code may include:

• Check Engine Light illuminated on the dashboard
• Decreased engine performance and acceleration
• Reduced fuel efficiency
• Engine knocking noise, especially under acceleration
• Rough idling or stalling in severe cases.

What causes the P0328 code?

Common causes for the P0328 code include:

• Faulty knock sensor 1
• Damaged or frayed wiring in the knock sensor circuit
• Poor connections at the sensor or ECM
• Engine control unit (ECU) software issues
• Mechanical issues within the engine, such as excessive noise.

How to fix P0328?

To resolve the P0328 fault code, the following steps are typically recommended:

• Inspect the wiring and connectors for signs of damage or corrosion; repair or replace as necessary.
• Test the knock sensor's resistance and operation; replace the sensor if faulty.
• Clear the fault code from the ECM and take the vehicle for a test drive to see if the code returns.
• If the problem persists, consider checking for mechanical issues or updating the ECU software.