Knock Sensor 2 Circuit High Input (Bank 2)
The P0333 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the knock sensor 2 (located on bank 2 of the engine) that is higher than the expected range. This sensor detects engine knock or pinging and sends a signal to the ECM to adjust ignition timing. A high input suggests a short to voltage, a faulty sensor, or wiring issues. Bank 2 refers to the side of the engine opposite cylinder #1.
01. Most Common Causes
- Faulty knock sensor 2
- Short to voltage in sensor wiring or connector
- Corroded or damaged connector
- ECM malfunction (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance and fuel economy
- Engine knocking or pinging under load
- Possible hesitation or rough idle
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect knock sensor 2 wiring and connector for damage, corrosion, or shorts.
Step 3: Test sensor resistance and voltage with a multimeter (specs vary by vehicle).
Step 4: Clear code and test drive to see if it returns.
Step 5: If code persists, replace knock sensor 2.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as engine knock can cause internal damage. Short trips to a repair shop are okay.
How much does it cost to fix?▼
Replacing a knock sensor typically costs $150-$400 including parts and labor, depending on vehicle accessibility.