What causes a P0325 code?

P0325 can be triggered by several issues — see the verified probable causes and step-by-step diagnostics shared by mechanics and owners on OBDIY.

Can I drive with a P0325 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0325 active.

Follow the step-by-step diagnostic on this page, then read the verified fixes contributed by other Heavy Truck owners — the answer marked "Verified Cause" worked for the original poster.

OBDIY

OBD-II

P0325

Knock Sensor 1 Circuit Malfunction (Bank 1)

What it means

The Engine Control Module (ECM) detects an out-of-range signal or an open circuit from the knock sensor used to monitor cylinder combustion vibration.