What causes a P140D code?

P140D 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 P140D code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P140D 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

P140D

CCV inlet temperature sensor over range

What it means

The engine control module (ECM) detects that the signal from the CCV inlet temperature sensor is higher than the maximum allowable voltage/range, indicating a possible sensor failure or wiring issue.