Parts
$30–80
P0330 — Knock Sensor 2 Circuit — Bank 2
CAUTIONIs it safe to drive? Same protective timing retard as P0325 — drivable but you'll feel the power loss; don't delay on a V6/V8 where Bank 2 covers half the engine.
What P0330 means
On V-configuration engines, Bank 2 is the side opposite cylinder 1. The second knock sensor covers that bank. A circuit fault there means the ECM can't detect detonation on Bank 2 cylinders and defaults to protective timing.
Most likely causes (in order)
- Connector or wiring fault on Bank 2 sensor (start here)
- Knock sensor element failed
- Sensor torque incorrect
- Coolant or oil leak contacting wiring harness
- Actual detonation from carbon or low-octane fuel triggering protective shutdown
Symptoms you might notice
- power loss
- fuel economy drop
- pinging under load
- CEL on
What to check first
Compare Bank 1 and Bank 2 knock sensor voltage in live data — both should read near 2.5V DC at idle. If Bank 2 reads 0V or 5V and Bank 1 is normal, the sensor or its wiring is the problem, not an engine knock condition.
Repair cost & difficulty
Labor
0.5–2.5 hr
Difficulty
Moderate