P0793 Intermediate Shaft Speed Sensor Circuit No Signal

P0793 means the intermediate shaft speed sensor circuit has no signal. The controller is missing a speed input needed for ratio and shift control.

Code details

Generic OBD-II · P0

System: Transmission
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace the transmission because of a no-signal speed code; start with sensor, wiring, connector, and reluctor checks.

Symptoms of P0793

Harsh, delayed, or slipping shifts, or being stuck in one gear.
Check-engine light, sometimes with limp-home mode.
Flaring RPM or a shudder under load.

Common causes of P0793

Low or degraded transmission fluid.
A failing speed sensor, shift solenoid, or pressure-control circuit.
Wiring, connector, or internal hydraulic/mechanical faults.

Useful checks before replacing parts

Check sensor power or reference, ground, signal circuit, connector condition, internal harness, and sensor mounting.
Compare input speed, intermediate speed, output speed, and commanded gear while safely testing the vehicle.
Inspect for metal debris, damaged reluctor, fluid intrusion, or recent transmission service that affected the sensor.

Related OBD-II codes

These nearby transmission entries can help compare wording and pin down the fault area.