P0330: Knock/Combustion Vibration Sensor B Circuit
What to do
Expect slightly reduced performance. If the sensor was recently replaced, mounting torque is worth confirming.
What this code means
A circuit fault in knock sensor B — the bank 2 sensor on a V engine — mirroring P0325, where the lettering and the older Knock Sensor 2 name are explained. Where both banks report together, the shared wiring or the module's knock-processing input is a better suspect than two sensors failing at once — and on engines where the sensors sit under the intake manifold, the shared harness is genuinely vulnerable.
Likely causes
Start here
- Faulty knock sensor · moderate
- Incorrect knock sensor mounting torque · moderate
- Corroded or loose connector · easy
- Open circuit in sensor wiring · moderate
Rare
- Failed control module · specialist
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
Be the first to write this up
Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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