What causes a P2418 code?

P2418 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 P2418 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P2418 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

P2418

P2418 Evaporative Emission System Switching Valve Control Circuit Open

What it means

This code indicates an electrical interruption or open circuit in the control circuit of the switching valve for the evaporative emission (EVAP) system. In heavy-duty diesel applications, this typically refers to a specialized purge or venting valve used in auxiliary emission control systems.