What causes a P1724 code?

P1724 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 P1724 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1724 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

P1724

EMPCD P3 control deviation diagnosis negative

What it means

EMPCD P3 control deviation diagnosis negative indicates that the actual exhaust back pressure is lower than the commanded setpoint, meaning the exhaust brake/butterfly valve is not closing or sealing correctly.