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.
Medium severity. Can I keep driving?Drive gently to a repair shop. If it slips, you hear clunks, or it loses its gears, do not keep driving.
Symptoms
- Check engine light
- Limp mode
- Harsh shifts
- Accompanying codes P0717/P0791
Most likely causes
- Sensor faulty (internal open circuit)
- Wire open or connector loose
- Reluctor wheel or air gap
- Transmission module
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It can trigger limp mode.
- It affects emissions.
What each character of P0793 means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- 7: Transmission
- 93: Specific fault in that system
Frequently asked questions
Can I keep driving with code P0793?
Drive gently to a repair shop. If it slips, you hear clunks, or it loses its gears, do not keep driving.
What causes code P0793?
The most common causes are: sensor faulty (internal open circuit); wire open or connector loose; reluctor wheel or air gap.
Related codes
- P0791Intermediate Shaft Speed Sensor A Circuit
- P0792Intermediate Shaft Speed Sensor A Circuit Range/Performance
- P0794Intermediate Shaft Speed Sensor A Circuit Intermittent
- P0717Input/Turbine Shaft Speed Sensor A Circuit No Signal
- P0722Output Shaft Speed Sensor Circuit No Signal
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.