Input/Turbine Shaft Speed Sensor B Circuit Range/Performance
What it means
P2766 means the transmission control module sees an implausible or out-of-range signal from the "B" input/turbine shaft speed sensor, which measures how fast the transmission input is turning. Bad data leads to erratic or harsh shifting and possible limp mode. It's usually a sensor, tone-ring, or wiring fault, not an engine issue.
Can I keep driving? Drivable but may shift erratically or enter limp mode — the engine starts and runs fine; get it checked.
Real-world scan data
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
Common symptoms
What you'll notice
- Check-engine light on
- Erratic, harsh, or wrong-gear shifts
- Possible limp mode
- Speedometer or gear indicator issues
Common causes
Most likely first
- Faulty input/turbine shaft speed sensor BLikely
- Debris on the sensor tip or a damaged tone ringCommon
- Wiring or connector fault (intermittent or high resistance)Common
- Low or dirty transmission fluidLess often
- Faulty TCM (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame and compare input/turbine, intermediate, and output speeds.
- Inspect the sensor and connector; check for debris on the tip.
- Check the wiring for opens, shorts, or high resistance.
- Verify transmission fluid level and condition.
- Replace the sensor if the signal is out of range; clear and road-test.
FAQ
Quick answers
Is it safe to drive with P2766?+
Can I just clear P2766?+
Related codes
Read & clear P2766 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.