What causes a P140F code?

P140F 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 P140F code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P140F 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

P140F

Venturi Delta Pressure Plausibility (positive) fault

What it means

The engine ECM detects that the pressure difference across the EGR Venturi tube is higher than expected for the current engine operating conditions, indicating an irrational or 'implausible' signal.