What causes a P2400 code?

P2400 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 P2400 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P2400 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

P2400

Evaporative Emission System Leak Detection Pump Control Circuit Open

What it means

The Engine Control Module (ECM) has detected an open circuit in the control line for the evaporative leak detection pump, which is primarily found on gasoline-fueled vocational trucks or specialized regional-haul applications.