What causes a P0723 code?

P0723 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 P0723 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0723 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

P0723

P0723 - Output Shaft Speed Sensor Intermittent Circuit

What it means

The Transmission Control Module (TCM) has detected an irregular, intermittent, or erratic signal from the output shaft speed sensor. This sensor is critical for determining road speed and managing gear shift timing.