P0793Intermediate Shaft Speed Sensor A Circuit No Signal
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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. P0793 means there is no pulse signal from the intermediate shaft sensor although the vehicle is moving according to other speeds. Toyota's bulletin for the U760 six-speed lists P0793 with P0717 and P0791 and replaces the countershaft sensor with a revised part. Ford reports the same fault under P0791 (below 250 rpm for 5 s). Note that a 2007 Allison table's 'P0793' for shift solenoid 1 low is a typo for P0973. Limp mode and check engine light follow.
- What you may notice
- Check engine light
- Limp mode
- Harsh shifts
- Accompanying codes P0717/P0791
- Likely causes
- LikelySensor faulty (internal open circuit)
- PossibleWire open or connector loose
- RareReluctor wheel or air gap
- RareTransmission module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €150 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.