P0332
Knock Sensor 2 Circuit Low
If your code reader dashboard displays the generic DTC error code P0332, your vehicle is currently experiencing an active failure related to "Knock Sensor 2 Circuit Low". Proper system troubleshooting is required to safely clear this warning.
Driver's Summary
When your OBD2 scanner shows P0332, the engine control module has flagged an issue specifically related to knock sensor 2 circuit low. Drivers typically experience reduced engine power, check engine light, poor fuel economy when this code is active. You can typically drive short distances, but ignoring this code long-term will cause accelerated component wear and higher repair costs.
Symptoms
Reduced engine power, check engine light, poor fuel economy
Common Causes
- Faulty Knock Sensor 2
- Wiring short to ground
- Loose sensor
- Poor ground connection
How to Fix
- 1 Replace Knock Sensor 2
- 2 Fix shorted wire
- 3 Ensure proper torque on sensor
- 4 Clean engine ground straps
Technical Explanation
Detection of P0332 occurs when the ECM cross-references multiple sensor inputs and determines that the reported values are physically inconsistent or out-of-range. Misfire rate is counted per cylinder over rolling windows and compared against two thresholds: a catalyst-damaging rate (triggers flashing MIL) and an emissions-exceeding rate (triggers solid MIL). The PCM logs which cylinder is misfiring based on crankshaft position at the time of each detected event. The fault remains stored in memory even after the MIL is cleared; it becomes a confirmed DTC after failing two consecutive drive cycles, and the PCM logs a freeze frame record of the engine's exact operating state at the moment of detection.
Is It Safe to Drive?
You can drive short distances, but the symptoms — reduced engine power, check engine light, poor fuel economy — indicate the affected system is compromised. Leaving this unresolved will lead to progressively worse fuel economy and potential damage to components beyond the original fault.
Mechanic's Pro Tip
Before replacing any component on P0332, spend 5 minutes inspecting the wiring harness and connector first — corrosion, chafed insulation, and backed-out pins cause the majority of these faults and cost nothing to fix. Use a multimeter to measure voltage drop across the connector pins under load; anything above 0.1V indicates excessive resistance that will cause intermittent failures even after replacing the sensor.
Knock sensor and intake gaskets: $250 - $600