P0794 code meaning
Intermediate Shaft Speed Sensor A Circuit Intermittent
Powertrain system Generic code P07xx codes Check engine light
What P0794 means
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.
P0794 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor1 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0794
- Occasional transmission warning
- Harsh shift now and then
- Limp mode, gone after restart
Common causes of P0794
- Most likelyLoose contact at the connector or broken wire
- PossibleSensor thermally unstable
- Less likelyInterference (ground, shielding)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Intermediate shaft speed sensorSensor wiringTransmission control module
What each part of P0794 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 7 | Area: transmission. |
| 94 | The exact fault in that area. |
What to do next
- Note P0794 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0794
What does P0794 mean?
P0794 means "Intermediate Shaft Speed Sensor A Circuit Intermittent". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P0794?
Drive gently and only to a workshop. With P0794 the car can go into limp mode (reduced power) to protect itself.
Will P0794 fail an emissions test?
Yes, it can. P0794 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0794 to fix?
Difficulty: medium. A typical repair takes 1 to 3 hours of work. This is a job for a workshop.
Will P0794 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.