What causes a P0452 code?

P0452 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 P0452 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0452 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.

OBD-II

P0452

P0452 Evaporative Emission System Pressure Sensor Low Input

What it means

Indicates that the Engine Control Module (ECM) has detected a voltage signal from the fuel tank pressure sensor that is below the specified range. On heavy-duty diesel engines, this often relates to specialized fuel tank venting or auxiliary emission systems rather than standard gasoline vapor recovery.