P2766
Input/Turbine Shaft Speed Sensor B Circuit Range/Performance
The second input shaft speed sensor reading is implausible against the primary sensor. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Damaged tone wheel teethCommon
- Sensor air gap driftPossible
- Sensor element aged beyond calibration windowLess likely
Parts involved
- Input Shaft Speed Sensor B
- Tone Wheel
P2766 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.