P0332
Knock Sensor 2 Circuit Range/Performance (Bank 2)
Powertrain Ignition System Knock Detection 🟡 Moderate — Fix within a week
💬
What This Actually Means
In plain language — no jargon

Your engine's knock sensor on the right side isn't sending the right signal to the computer, like a smoke detector that's either too quiet or not working. This prevents the engine from properly detecting fuel knock (pinging) and adjusting timing to prevent damage.

⚡
Symptoms You May Notice
3 known symptoms for this code
Check Engine Light illuminated
Engine pinging or knocking under acceleration
Reduced fuel economy or rough idle
🔬
Embedded Systems Insight
What the ECU/ECM is actually computing

The knock sensor detects vibrations from pre-detonation and sends voltage signals to the ECM. The ECM monitors signal amplitude and frequency; if the reading falls outside expected range or shows no activity, it triggers this fault. A healthy knock sensor produces oscillating signals between 100-200 mV peak amplitude.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Knock sensor signal amplitude 100–200 mV peak <50 mV or >300 mV, or no signal
Signal frequency response 4–8 kHz range Below 4 kHz or erratic frequency
🔧
Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Knock sensor connector
Inspect and reseat the connector on Bank 2 knock sensor; corrosion or loose pins often cause signal loss.
2
Engine wiring harness (Bank 2 knock sensor circuit)
Check for damaged, pinched, or corroded wiring between the sensor and ECM; repair or replace as needed.
3
Knock Sensor 2 (Bank 2)
Replace the knock sensor if connectors and wiring are sound; sensor failure is the most common cause.