Intermediate Shaft Speed Sensor A Circuit No Signal
What it means
P0793 means the transmission control module is receiving no signal from intermediate shaft speed sensor A. Without that speed input the module can't correctly calculate gear ratios and shift timing, so shifts become harsh or erratic and the transmission may enter limp mode. It's usually a failed sensor, wiring fault, or damaged reluctor ring.
Can I keep driving? Often drivable but shifting can be harsh or erratic; get it diagnosed soon.
Real-world scan data
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
Common symptoms
What you'll notice
- Harsh or erratic shifting
- Slipping or delayed shifts
- May enter limp mode
- Speedometer or odometer glitches possible
- Check-engine or transmission warning light on
Common causes
Most likely first
- Faulty intermediate shaft speed sensorLikely
- Open or short in the sensor wiring or connectorCommon
- Corroded connectorCommon
- Damaged sensor reluctor ringLess often
- Transmission control module fault (less common)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and note any companion speed-sensor codes.
- Inspect the sensor connector and wiring for an open, short, or corrosion.
- Check the sensor air-gap and inspect the reluctor ring for damage.
- Test the sensor's output while the wheels or shaft turn.
- Replace the intermediate shaft speed sensor if it produces no signal.
FAQ
Quick answers
Is it safe to drive with P0793?+
Can I just clear P0793?+
Related codes
Read & clear P0793 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.