Knock/Combustion Vibration Sensor B Circuit Low
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.
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.
Real-world scan data
Appears alongside · share of P0332 scans
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
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.
P0332 by make
Based on commonly reported failure patterns across owner and repair communities, not on our scan data.
Chevrolet
On Chevrolet V8 trucks and cars, the knock sensors sit under the intake manifold, so replacing one is a bigger job than usual. Wiring damage and oil or coolant leaks from the intake gaskets are common causes.
GMC
On GMC V8 trucks and SUVs, the knock sensors sit under the intake manifold, so replacing one is a bigger job than usual. Wiring damage and oil or coolant leaks from the intake gaskets are common causes.
Nissan
On Nissan V6 models, the knock sensor on bank 2 is a common wear item, and a damaged harness is another possible cause. Check the harness before replacing the sensor.
Toyota
On Toyota V6 models, the knock sensors sit under the intake manifold, so replacing one is a bigger job than usual. A damaged harness is a common cause.
FAQ
Quick answers
Is it safe to drive with P0332?+
Can I just clear P0332?+
Related codes
Read & clear P0332 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.