OBD-II code · Powertrain (generic)
P0332 Knock Sensor 2 Circuit Low Input (Bank 2)
Knock sensor 2 (bank 2) reports a signal level below the diagnostic threshold. The sensor is a piezo element bolted to the engine block; output should be a small AC voltage on each combustion event. A cold or open sensor reads 0 V; a loose mounting bolt damps the signal. Without knock detection, the ECM retards spark globally as a safety measure — fuel economy and power suffer.
Is it safe to drive with P0332?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyKnock sensor failed
- PossibleSignal wire shorted to ground
- Less likelyConnector pins corroded - high contact resistance
Symptoms
- Check engine light on
- Power loss from defensive spark retard
- Increased fuel consumption
- Possible audible pinging under load
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–6 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Knock Sensor, Sensor Wiring
Related codes
- P0327Knock Sensor 1 Circuit Low Input (Bank 1)
- P0330Knock Sensor 2 Circuit (Bank 2)
- P032FCombustion Engine Producing Insufficient Torque
- P0331Knock/Combustion Vibration Sensor B Circuit Range/Performance
- P0333Knock Sensor 2 Circuit High Input (Bank 2)
- P0334Knock/Combustion Vibration Sensor B Circuit Intermittent
- P0335Crankshaft Position Sensor "A" Circuit Malfunction
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.