P0332
Knock/Combustion Vibration Sensor B Circuit Low
Ignition / knock control
Generic OBD-II
Medium
What it means
P0332 means the second (bank 2) knock sensor's circuit is reading below its normal voltage range, usually from a failed sensor or a wiring short to ground. Without a trustworthy knock signal, the ECM often retards ignition timing as a safeguard, which slightly reduces power and economy until the sensor or wiring is repaired.
Medium
Can I keep driving? Driveable. The ECM may retard timing as a precaution, so expect slightly less power and economy until the bank 2 knock sensor is fixed.
Common symptoms
What you'll notice
- Check-engine light on
- Slightly reduced power or fuel economy
- Possible pinging or knock under load
- Minor hesitation in some cases
Common causes
Most likely first
- Failed knock sensor B (bank 2) with low outputLikely
- Wiring shorted to ground in the sensor circuitCommon
- Open or high-resistance connection at the connectorCommon
- Corroded or loose electrical terminalsLess often
- Failed ECM (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and check for related knock-sensor codes.
- Inspect the bank 2 knock sensor connector and wiring for a short to ground or corrosion.
- Measure the sensor's resistance and signal voltage against spec.
- Confirm correct sensor mounting and torque — a loose sensor can read low.
- Replace the knock sensor if out of range. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0332?+
Yes, for normal driving. The ECM protects the engine by retarding timing, so you lose a little power. Fix it before extended high-load driving to prevent knock damage.
Can I just clear P0332?+
It comes back while the circuit still reads low. Repair the wiring or replace the sensor first, then clear and re-test.
Related codes
Often seen with P0332
Read & clear P0332 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX