Knock Sensor 2 Circuit Low (Bank 2)
What does P0332 mean?
The P0332 code means the vehicle's onboard diagnostic system has detected: Knock Sensor 2 Circuit Low (Bank 2). This is a moderate severity code.
Common Symptoms
- Check Engine Light illuminated
- Reduced engine power
- Engine pinging under load
- Poor fuel economy
- Hesitation during hard acceleration
Probable Causes (Ranked by Likelihood)
- Faulty knock sensor 2 producing weak signal Very High
- Short to ground in knock sensor 2 wiring High
- Corroded or loose sensor connector High
- Sensor installed with insufficient torque Moderate
- PCM input circuit fault Low
Step-by-Step Diagnostic Procedure
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Test knock sensor 2 output by tapping the engine block near bank 2 while monitoring voltage
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Check for shorts to ground in the sensor signal wire with sensor disconnected
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Inspect the connector for corrosion, oil contamination, or pushed-back pins
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Verify the sensor is torqued to specification
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Replace the knock sensor if output is consistently below threshold
Frequently Asked Questions
Can I drive with code P0332?
You can drive short distances. The PCM will retard ignition timing on bank 2 as a precaution, which reduces power but protects the engine from potential knock damage.
Can oil contamination cause a low knock sensor signal?
Yes. Oil leaking onto the knock sensor connector can short the signal to ground or create a conductive path that weakens the signal, triggering a low circuit code.
Should I replace both knock sensors at the same time?
If the intake manifold must be removed to access the sensors, replacing both is recommended to save on labor costs. The sensors are inexpensive relative to the labor involved.