What it means
A general electrical fault in the bank 2 knock sensor circuit. The ECU monitors a piezoelectric sensor for engine vibration patterns associated with detonation; an open, shorted, or out-of-range circuit triggers this code.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Knock sensor 2 on bank 2 detects vibration in that bank and sends a signal to the engine controller so it can distinguish normal combustion from knock. P0330 sets when the bank 2 sensor circuit has an electrical fault, such as an open, short, or signal outside the expected range; the controller may retard spark as a precaution.
Common causes
Most likely first.
- Knock sensor failed
- Wiring/connector fault
Symptoms
- Check engine light on
- Power loss from defensive spark retard
- Increased fuel consumption
- Possible audible pinging under load
How to diagnose it
- Check freeze-frame data and scan for related knock-sensor or engine-control codes to establish when the bank 2 circuit fault occurred.
- Locate knock sensor 2 and inspect its connector and wiring for damage, corrosion, loose pins, or contact with hot or moving parts.
- With the ignition off and using the wiring diagram, check the bank 2 sensor circuit for opens or shorts and compare readings with the manufacturer's specification.
- Test the sensor according to the manufacturer's procedure and compare its circuit readings with the specified range.
- Repair the wiring or connector fault found, or replace the sensor if the circuit checks pass but the sensor fails its test.
Common fixes
- Secure a loose bank 2 knock-sensor connector or repair damaged wiring.
- Clean or repair corroded connector terminals and ensure a sound connection.
- Replace knock sensor 2 on bank 2 if it fails the specified test.
- Clear the code and confirm the circuit remains fault-free after operation.
Can I keep driving?
A short, gentle trip may be possible, but avoid heavy throttle and steep hills because knock detection on bank 2 may be unreliable and spark may be retarded. Stop if you hear persistent pinging or the engine loses substantial power.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.