P0332
Knock Sensor 2 Circuit Low Input (Bank 2)
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The P0332 code means the ECM is receiving a voltage signal from Knock Sensor 2 on Bank 2 that is below the minimum expected threshold. This code appears on V-configuration engines (V6, V8, etc.) that use two knock sensors — one per bank. Bank 2 is the cylinder bank that does not contain cylinder number 1.
Knock sensors generate very small voltage signals in the millivolt range, so even minor corrosion on a connector pin or slight looseness in the sensor mounting can drop the signal below the ECM's threshold. This is one of the most common sensor-related codes on higher-mileage V6 and V8 vehicles, particularly Toyota, Lexus, and Nissan models.
The good news is that this code does not indicate an emergency. The ECM will compensate by using a more conservative (retarded) ignition timing map, which protects the engine but costs you some power and fuel efficiency. Plan to have it addressed within a month. Many experienced owners replace both knock sensors at the same time since the labor to access them is the expensive part, especially on engines where they sit under the intake manifold.
Severity
Symptoms
- •Check Engine light is on
- •Reduced engine power during acceleration
- •Slight pinging or knocking sound under load
- •Decreased fuel efficiency
- •Engine may feel less responsive than normal
Likely Causes
The Bank 2 knock sensor has degraded internally, producing a voltage signal below the ECM's minimum acceptable threshold.
Corrosion, broken wires, or poor connections in the Bank 2 knock sensor circuit are introducing resistance and reducing the signal voltage.
The knock sensor is not properly seated against the engine block due to incorrect torque or a dirty mounting surface, reducing vibration transfer and signal output.
A degraded or corroded ground connection in the knock sensor circuit is preventing the full signal from reaching the ECM.
An internal ECM circuit failure is causing it to misinterpret the Bank 2 knock sensor signal as low.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Replace the Bank 2 knock sensor
- Repair or replace corroded wiring and connectors
- Clean and re-torque the sensor to specification
- Repair ground connections in the sensor circuit
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