Powertrain, generic (extended)

P2766 Input/Turbine Shaft Speed Sensor B Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2766 marks a sensor B signal that is present but erratic or implausible. Ford's 2012 strategy applies it to the DPS6 dual-clutch box, where sensor B reads input shaft 2. In Mitsubishi's 2022 CVT, sensor B is in fact the secondary pulley sensor on the output side: with the converter locked and engine, primary pulley and input speeds within 1,000 rpm of one another, a pulley ratio above 2.9 or below 0.3 for 5 s sets the code, two trips, MIL on. Infiniti bulletin ITB20-027 for the 2019 QX50 CVT covers a permanent P2766, among other transmission codes, that will not clear after the prescribed procedure; the fix is a new TCM. Erratic signals point to a dirty sensor, interference, or a loose fit.

Likely causes

Sensor B fouled with metal debris or not seated firmly
Interference or poor ground on the signal circuit
TCM fault keeping the code stored permanently

Symptoms

  • Check engine light after two drives
  • Sluggish acceleration, manual mode unavailable
  • Torque converter lock-up disabled

Repair estimate

DifficultyHardWorkshop job
Parts and labour€120–2,000
Time0.5–6 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

input shaft speed sensor btone wheel

Related codes

P2765P2767P2768P0716P2784

References: mitsubishitechinfo.com, static.nhtsa.gov, newtonnet.co.uk.