Knock Sensor 2 Circuit Low Input (Bank 2)
The P0332 code indicates that the Engine Control Module (ECM) has detected a low voltage signal from the knock sensor on bank 2 of the engine. The knock sensor detects engine knocking or pinging and sends a signal to the ECM to adjust ignition timing. A low input means the sensor's voltage is below the expected range, which can be caused by a faulty sensor, wiring issues, or a poor connection. This can lead to incorrect timing adjustments, reduced performance, and potential engine damage if not addressed.
01. Most Common Causes
- Faulty knock sensor 2
- Damaged or corroded wiring/connector to knock sensor 2
- Engine mechanical issue causing excessive noise (e.g., worn bearings, timing chain slack)
- ECM software or hardware failure (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power and acceleration
- Poor fuel economy
- Engine knocking or pinging noise under load
03. Step-by-Step Diagnosis
Step 1: Connect an OBD2 scanner and confirm code P0332. Check for additional codes.
Step 2: Visually inspect the knock sensor 2 wiring and connector for damage, corrosion, or loose connection.
Step 3: Test the knock sensor resistance with a multimeter (typically 100k-1M ohms at room temperature). Replace if out of spec.
Step 4: Check for engine mechanical issues (e.g., excessive noise) that could cause false knock readings.
Step 5: Clear codes and test drive. If code returns, 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 for extended periods as the ECM may not properly adjust timing, potentially causing engine damage from knocking. You can drive short distances to a repair shop, but avoid heavy loads and high RPMs.
How much does it cost to fix?▼
The cost typically ranges from $150 to $400, including parts and labor. The knock sensor itself costs $30-$100, and labor is 1-2 hours depending on accessibility.