What causes a P0459 code?

P0459 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 P0459 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0459 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

P0459

P0459 Evaporative Emission System Purge Control Valve Circuit High

What it means

Indicates the engine control module has detected a high voltage condition in the purge control valve circuit, typically signifying a short to power or a failed solenoid.