P0330: Knock Sensor 2 Circuit (Bank 2)
The engine computer sees a problem with knock sensor 2, the one that listens for pinging on bank 2 of a V engine.
What P0330 means
P0330 is the bank 2 counterpart to P0325. Engines with two cylinder banks often use one knock sensor per bank, and sensor 2 covers bank 2. The engine computer has found the signal from that sensor out of range, erratic or missing. KBB notes that you can often drive for a short time with knock sensor codes, but they should be fixed soon because these sensors protect the engine. Causes include a failed sensor, a damaged wire or connector, and on some engines real detonation from low octane fuel, overheating or a lean condition. When P0325 and P0330 appear together, look for a shared problem such as a single harness that runs to both sensors or a common ground. Shops check resistance and output of both sensors and inspect the harness. Since knock sensors on many V engines are under the intake manifold, a shop may recommend replacing both sensors and the harness in one job rather than paying the labor twice.
Common symptoms
- Check engine light on
- Pinging on acceleration in some cases
- Reduced power
- Lower fuel economy
- May appear with P0325
Most common causes
- Faulty knock sensor 2
- Damaged or corroded wiring or connector
- Real detonation on bank 2
- Low octane fuel
- Loose sensor mounting
What to check yourself first
If both P0325 and P0330 are set, a shared harness or connector is a likely cause. Use the fuel octane your owner manual specifies. Check for coolant or oil leaks that could reach the sensor wiring.
Typical fixes and what they cost
| Fix | Typical cost | Note |
|---|---|---|
| Replace knock sensor | $417-$589 | If both knock sensors are under the intake, shops often replace both at once to save labor later. |
| Electrical diagnosis to find a wiring or connector fault | $122-$179 | For wiring faults, which are common in the engine valley. |
| Check engine light diagnosis at a shop | $125-$183 | Checks for real knock causes such as overheating or a lean mixture. |
Typical US price ranges for parts and labor, not quotes. Your shop should confirm the cause with a diagnostic before replacing parts.
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Related codes
- P0325 Knock Sensor 1 Circuit (Bank 1 or Single Sensor)
- P0327 Knock Sensor 1 Circuit Low (Bank 1 or Single Sensor)
- P0174 System Too Lean (Bank 2)
- P0300 Random/Multiple Cylinder Misfire Detected
- P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)