Powertrain, generic · Transmission

P0794 Intermediate Shaft Speed Sensor A Circuit Intermittent

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

The intermediate shaft speed sensor measures a shaft between input and output – a countershaft on Toyota's U760 six-speed, the intermediate shaft behind the overdrive set on Ford's 5R110W. Together with turbine and output speed it lets the module check each gear stage and control clutch slip. P0794 means the intermediate shaft signal drops out or jumps briefly – not long enough for P0793 – typically a loose contact or a wire breaking under movement. No manufacturer document available to us uses this code; the expected logic counts unrealistic jumps like Ford's P0718 for the turbine sensor (200 spikes within 1.5 s each). Occasional harsh shifts follow, and limp mode after several events.

Likely causes

Loose contact at the connector or broken wire
Sensor thermally unstable
Interference (ground, shielding)

Symptoms

  • Occasional transmission warning
  • Harsh shift now and then
  • Limp mode, gone after restart

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–600
Time1–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

intermediate shaft speed sensorsensor wiringtransmission control module

Related codes

P0791P0792P0793P0718P0723

References: law.cornell.edu, newtonnet.co.uk.