P0793 Code: Intermediate Shaft Speed Sensor — Causes & Fix
P0793 means a fault in the transmission intermediate shaft speed sensor circuit — a sensor some gearboxes use for precise ratio/shift control.
- Applies to
- All OBD-II vehicles (any make or model)
- Est. repair cost
- $40 – $600
- Time to fix
- 1–4 hours
What it means
Causes include a failed sensor, a damaged reluctor, low fluid, or wiring faults. P0793 is a generic OBD-II code defined in the SAE J2012 standard, so it applies to virtually any 1996-or-newer OBD-II vehicle regardless of make. Fix the underlying fault, then clear the code with an OBD-II scan tool — it will return if the problem isn't resolved.
Symptoms
- Check engine light on
- Harsh or erratic shifting
- Possible limp mode
How to fix it
- 1
Inspect the sensor and wiring
1. Check the intermediate shaft speed sensor connector and wiring. 2. Confirm fluid level.
- 2
Test/replace the sensor
1. Verify a clean signal on a scan tool. 2. Replace if faulty, then clear the code.
Frequently asked questions
What does the intermediate shaft sensor do?
It reports an internal shaft speed the controller uses to verify gear ratios and time shifts precisely, alongside the input and output speed sensors.
Last updated July 19, 2026
Guidance only — always consult a qualified professional or the official service manual before carrying out repairs.