What causes a P0466 code?

P0466 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 P0466 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0466 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

P0466

Purge Flow Sensor Circuit Range and Performance

What it means

The Engine Control Module detects that the actual flow rate measured at the EVAP purge flow sensor is outside of the expected parameters during a self-check.