Knock Sensor 2 Circuit Bank 2
The Powertrain Control Module (PCM) has detected an irregular or missing voltage signal from the knock sensor located on engine Bank 2. This prevents the engine computer from accurately monitoring and adjusting ignition timing to prevent harmful engine detonation.
While the vehicle is usually safe to drive in the short term, the engine computer will retard ignition timing to protect the engine. Prolonged driving could lead to decreased performance, poor fuel economy, or potential internal damage if severe knocking occurs.
Common symptoms
- Illuminated Check Engine Light
- Reduced engine power and sluggish acceleration
- Decreased fuel economy
- Audible pinging or knocking sound from the engine under load
- Slight hesitation during acceleration
Likely causes
- Faulty knock sensor on Bank 2
- Damaged, frayed, or melted knock sensor wiring harness
- Corroded or loose electrical connection at the sensor
- Coolant or oil leak contaminating the sensor and connector
- Faulty Powertrain Control Module (PCM) (rare)
What to check before replacing parts
Inspect the knock sensor wiring and connector on Bank 2
Look for: Look for frayed wires, melted insulation, or corrosion inside the connector that could interrupt the signal.
Use an OBD-II scan tool to monitor knock sensor data
Look for: Check if the sensor shows any voltage activity or if it remains static at zero when the engine is running.
Measure the resistance of the knock sensor using a multimeter
Look for: Compare the resistance reading to the manufacturer's specification; an open circuit (infinite resistance) or out-of-spec reading indicates a failed sensor.
Perform a tap test on the engine block near the sensor
Look for: Lightly tap the block with a wrench while monitoring the scan tool or a multimeter; a healthy sensor should generate a small AC voltage spike.
Check the wiring harness for continuity back to the PCM
Look for: Ensure there is no open or short circuit in the wires running between the knock sensor connector and the engine computer.
This page explains the generic P0330 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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