What does code P0325 mean on a Hyundai and is it safe to drive?
P0325: Knock Sensor 1 Circuit Malfunction (Bank 1). Here's what it means on your Hyundai, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
What this code means
The PCM isn't receiving a valid signal from knock sensor 1. Without knock feedback, the PCM retards ignition timing as a safety measure, reducing power and economy.
Common causes for your Hyundai
- Failed knock sensor
- Corroded or broken wiring/connector at the sensor
- Actual engine knock from carbon buildup or low-octane fuel
Symptoms
- Check Engine Light
- Reduced power and fuel economy (PCM retards timing)
- Possible audible knock or ping under load
Typical fixes
- Replace knock sensor
- Repair wiring and connector
- Use correct octane fuel and address carbon buildup
Repair cost range
For a Hyundai, repairs for P0325 often fall between $150 and $500, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Hyundai
Hyundai P0325 on Theta II engines should be taken seriously—given the known rod bearing failure issue on these engines, the knock sensor circuit should be fully functional. A failing knock sensor on a Theta II engine means the PCM cannot detect actual engine knock, which accelerates bearing damage. Verify the Theta II recall is complete on your VIN before assuming P0325 is just a sensor failure. On Genesis Coupe 2.0T, the knock sensor is accessible without major disassembly; check the sensor mounting torque first.
Most commonly affected models