P2766 code meaning
Input/Turbine Shaft Speed Sensor B Circuit Range/Performance
Powertrain system Generic code P27xx codes Check engine light
What P2766 means
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.
P2766 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 6 hours
- Clears after repairAfter a drive cycle
Symptoms of P2766
- Check engine light after two drives
- Sluggish acceleration, manual mode unavailable
- Torque converter lock-up disabled
Common causes of P2766
- Most likelySensor B fouled with metal debris or not seated firmly
- PossibleInterference or poor ground on the signal circuit
- Less likelyTCM fault keeping the code stored permanently
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Input shaft speed sensor bTone wheel
What each part of P2766 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 7 | Area: transmission. |
| 66 | The exact fault in that area. |
What to do next
- Note P2766 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2766
What does P2766 mean?
P2766 means "Input/Turbine Shaft Speed Sensor B Circuit Range/Performance". P2766 marks a sensor B signal that is present but erratic or implausible. It is a generic code, so it means the same on every make.
Is it safe to drive with P2766?
Drive gently and only to a workshop. With P2766 the car can go into limp mode (reduced power) to protect itself.
Will P2766 fail an emissions test?
Yes, it can. P2766 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2766 to fix?
Difficulty: hard. A typical repair takes 0.5 to 6 hours of work. This is a job for a workshop.
Will P2766 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.