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

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.

Symptoms

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

Most 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

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the fluid level and condition
2. Compare the reading with other engine data while varying the engine speed.
3. Read the input and output speed in live data
4. Check the connector and wiring
5. Check for other related engine codes
6. Consult the manufacturer's procedure for the transmission

Good to know

• Repair difficulty: hard
• It can trigger limp mode.
• It affects emissions.

What each character of P2766 means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• 7: Transmission
• 66: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2766?

Drive gently to a repair shop. If it slips, you hear clunks, or it loses its gears, do not keep driving.

What causes code P2766?

The most common causes are: 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.

Related codes

• P2765Input/Turbine Shaft Speed Sensor B Circuit
• P2767Input/Turbine Shaft Speed Sensor B Circuit No Signal
• P2768Input/Turbine Shaft Speed Sensor B Circuit Intermittent
• P0716Input/Turbine Shaft Speed Sensor A Circuit Range/Performance
• P2784Input/Turbine Speed Sensor A/B Correlation

Sources

• mitsubishitechinfo.com: N5040201C0009W00USA
• static.nhtsa.gov: MC 10185379 0001
• newtonnet.co.uk: fordobd2012

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.