Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P0325: Knock Sensor Module Circuit: Description
The Knock Sensor (KS) produces an AC voltage at all engine speeds and loads. Depending on the amplitude and frequency of the KS signal, the Powertrain Control Module (PCM) will adjust the spark timing. The PCM uses the KS signal in order to calculate the average voltage. The PCM inspects the KS and the related wiring by comparing the actual knock signal to the assigned voltage range. If the KS system is operating correctly, the PCM should monitor the KS voltage that is varying above and below a predetermined average voltage. This DTC will set if the PCM malfunctions in a manner that will not allow proper diagnosis of the KS system.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.