What causes a P1723 code?

P1723 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 P1723 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1723 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

P1723

EMPCD P3 control deviation diagnosis positive

What it means

The engine controller has detected that the exhaust back-pressure valve position is lower than commanded, indicating a 'positive' deviation where the valve is likely stuck open or moving too slowly.