P2768
Input/Turbine Shaft Speed Sensor B Circuit Intermittent
Transmission speed sensor
Generic OBD-II
Medium
What it means
P2768 means the input/turbine shaft speed sensor 'B' signal is intermittent or erratic. The transmission uses that input speed for shift control, so shifts can become unpredictable when the signal cuts out.
Medium
Can I keep driving? Usually drivable, but the dropping input/turbine speed signal can cause erratic or harsh shifting and occasional limp mode.
Common symptoms
What you'll notice
- Check-engine light on
- Erratic or harsh shifting that comes and goes
- Occasional limp mode
- Flares or wrong-gear engagement at times
Common causes
Most likely first
- Intermittent connection at a loose or corroded sensor connectorLikely
- Chafed or damaged wiring to the speed sensorCommon
- Faulty input/turbine shaft speed sensorCommon
- Metal debris on the sensor tip or a damaged tone ringLess often
- TCM fault (least likely)Less often
How to diagnose & fix
Work through it in order
- Read codes and freeze-frame; note when the signal drops out.
- Wiggle-test the sensor connector and wiring while watching live data.
- Inspect the sensor tip for debris and check the tone ring.
- Replace the input/turbine speed sensor if the signal is unstable.
- If wiring and sensor are good, suspect the TCM. Clear and road-test.
FAQ
Quick answers
Is it safe to drive with P2768?+
Generally yes, but shifts may feel unpredictable. Repair it before it becomes a steady fault or triggers limp mode.
Can I just clear P2768?+
It may clear briefly since it's intermittent, but it returns until the loose connection or sensor is fixed.
Related codes
Often seen with P2768
Read & clear P2768 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX