P2746Intermediate Shaft Speed Sensor B Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2746 means the sensor B signal exists but does not make sense. GM's 2023/24 dual-clutch TCM uses it for the clutch 2 speed sensor: with that clutch fully closed and no microslip, its speed must equal engine speed, and a gap of 150 rpm or more for 1.1 s sets the code; further tests compare it with the speed derived from the output shaft and watch synchronizer speed during gear engagement (above 200 rpm for 50 ms). GM lists it as Type A, so the MIL comes on at the first failure. Ford's 2024 summary bundles three checks of sensor B here: dropouts (800 rpm lost within 10 ms, ten times), noise (2,500 spikes of 300 rpm within 50 ms) and a mismatch with gear and other sensors lasting 2.5 s.
- What you may notice
- Check engine light, often immediately
- Jerky clutch engagement or erratic shifts
- Limp-home mode or one half of the gearbox disabled
- Likely causes
- LikelyMetal debris on the sensor tip or incorrect air gap to the reluctor
- PossibleInterference or poor shielding causing signal spikes
- PossibleSlipping clutch making the speed comparison fail
- RareDamaged or loose reluctor ring on the shaft
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €150 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.