What causes fault code P0330?

• Most likely: Faulty knock sensor (internal open or short circuit) • Likely: Damaged wiring harness (often due to rodents or high engine heat) • Possible: Corroded or loose electrical connectors • Rare: Faulty Engine Control Module (ECM) • Rare: Genuine mechanical engine knocking (uncommon for a circuit-specific code)

Powertrain (Engine & Gearbox)Standard EOBD

P0330 - Knock Sensor 2 Circuit Malfunction (Bank 2)

Q: What are the symptoms of fault code P0330?

• Check Engine Light (MIL) illuminated • Reduced engine power and poor acceleration • Increased fuel consumption • Engine hesitation or stumbling under load • Fails emissions test/inspection

Q: How do you fix fault code P0330?

STEP 1: Inspect the sensor connector for corrosion and ensure it is properly seated. Check the harness for signs of rodent damage or heat-induced brittleness. STEP 2: Perform a resistance test on the sensor. Typical values vary significantly by OEM (check service manual); an open circuit (infinite ohms) usually indicates a dead sensor. STEP 3: Check wiring continuity between the sensor connector and the ECM harness. Check for short to ground. STEP 4: Use an oscilloscope to monitor the sensor signal while tapping the engine block near the sensor. A healthy sensor should produce a small AC voltage spike. STEP 5: If the sensor is faulty, replace it. Torque to precise OEM specifications (usually around 15-20 Nm) as incorrect torque affects sensor sensitivity.

Last updated:1 February 2026

Related:Knock Sensor 2, Engine Control Module (ECM/ECU), Wiring Harness, Spark Plugs

System

Powertrain (Engine & Gearbox)

Related Fault Codes

P0300

Random or Multiple Cylinder Misfire Detected

P0301

Cylinder 1 Misfire Detected

P0302

Cylinder 2 Misfire Detected

P0303

Cylinder 3 Misfire Detected

Technical Description

P0330 is an OBD-II generic code indicating that the Engine Control Module (ECM) has detected a malfunction in the knock sensor 2 circuit on bank 2. The knock sensor identifies high-frequency vibrations caused by pre-ignition or detonation. The ECM monitors this circuit for a specific voltage frequency; if the signal is absent or outside of calibrated parameters, the ECM triggers P0330. As a safety measure, the ECM will typically retard ignition timing and may disable cruise control or limit boost pressure to protect the engine cylinders from damage.

Possible Causes

Faulty knock sensor (internal open or short circuit)

Damaged wiring harness (often due to rodents or high engine heat)

Corroded or loose electrical connectors

Faulty Engine Control Module (ECM)

Genuine mechanical engine knocking (uncommon for a circuit-specific code)

Symptoms

Check Engine Light (MIL) illuminated

Reduced engine power and poor acceleration

Increased fuel consumption

Engine hesitation or stumbling under load

Fails emissions test/inspection

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P0330 - Knock Sensor 2 Circuit Malfunction (Bank 2)

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P0330 - Knock Sensor 2 Circuit Malfunction (Bank 2)

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