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 Performance: Description
Knock Sensors (KS) produce an AC signal when specific frequencies are detected. Powertrain Control Module (PCM) calculates average voltage range of each KS signal. If KS system is operating properly, PCM should monitor KS voltage varying to more than and less than a calculated average voltage. KS system monitors both knock sensors in order to determine if knock is present. If KS system determines excessive knock is present, PCM retards spark timing based on signals from KS system. PCM retards timing until no knock is present.
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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.