What causes a P140B code?

P140B 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 P140B code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P140B 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

P140B

Venturi temperature rate of change fault

What it means

The engine control module (ECM) detects that the rate of change in the exhaust gas recirculation (EGR) temperature at the venturi pipe is outside of the calibrated range, indicating a potential sensor or flow issue.