What causes a P0793 code?

P0793 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 P0793 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0793 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

P0793

Intermediate Shaft Speed Sensor Circuit No Signal

What it means

The Transmission Control Module (TCM) has detected a loss of signal from the intermediate shaft speed sensor while the vehicle is in motion. This sensor monitors the rotational speed of the internal transmission shaft to ensure proper gear synchronization and torque converter operation.