Ignition

P0330 — Knock Sensor 2 Circuit Malfunction (Bank 2)

Severity: medium Drive with care, to a shop

What P0330 means

A knock sensor works like a microphone, picking up engine block vibrations caused by detonation so the ECM can retard ignition timing. P0330 means the signal from the bank 2 sensor is missing, too weak or out of range. Without a reliable signal the ECM cannot protect the engine properly and usually falls back to conservative, retarded timing.

Symptoms

  • Check Engine Light on
  • Hesitation or reduced power
  • Sluggish acceleration
  • Pinging or knocking noise under load
  • Worse fuel economy
  • Rough idle in some cases

Possible causes

  1. Failed bank 2 knock sensor
  2. Damaged wiring: open circuit or short to ground or voltage
  3. Corroded or loose knock sensor connector
  4. Sensor loose or tightened to the wrong torque
  5. Real mechanical or fuel causes of knock: low octane, overheating, carbon buildup
  6. ECM fault (rare)

How to diagnose

  1. Scan all codes and freeze frame data and look for other ignition or fuel codes
  2. Inspect the bank 2 knock sensor connector and harness for chafing, oil contamination and corrosion
  3. Check that the sensor is tight and seated flat against the block
  4. Measure sensor resistance and compare it with the vehicle's specification
  5. Test the signal wire and shield for continuity and for shorts to ground or power
  6. Use a scope or scan tool to confirm the sensor responds when you tap the block near it
  7. Rule out real knock: fuel quality, engine temperature, spark plugs, carbon deposits
  8. If the sensor and wiring are good, check ECM power and grounds

Common fixes

  • Replace the bank 2 knock sensor
  • Repair the wiring harness or replace a damaged connector
  • Reinstall the sensor to the correct torque on a clean mounting surface
  • Fix the underlying cause of knock (fuel, overheating, carbon)
  • ECM repair or replacement as a last resort

P0330 on different brands

Ford · manuals
Ford uses a three-byte format, P0330:01, on its 2024-2025 gasoline engines to flag the monitor condition detected in the knock sensor 2 circuit, not a confirmed failed part.

Questions and answers

What does P0330 mean?

It means the ECM sees a bad or weak signal from the bank 2 knock sensor circuit. The cause is most often the sensor itself or its wiring.

Can I drive with P0330?

For a short time, gently, yes. The engine lacks full knock protection, so repair it soon to avoid possible damage.

Will clearing the P0330 code fix it?

No. If the cause remains, the code will return. Check the connector, wiring and sensor first.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.