Input/Turbine Shaft Speed Sensor B Circuit
What it means
P2765 means the TCM detected a fault in the "B" input/turbine shaft speed sensor circuit — the sensor that measures how fast the transmission's input (turbine) shaft is turning so it can time and control shifts. Without a valid signal, shifts can turn harsh or the transmission may go into limp mode. The engine still starts and runs; the causes are usually a wiring/connector fault or a failed sensor.
Can I keep driving? The engine starts and runs, but the transmission may shift harshly, hold a gear, or enter limp mode without a valid input-speed signal. Drive gently and get it checked.
Common symptoms
What you'll notice
- Check-engine light on
- Harsh, delayed, or incorrect shifting
- Transmission stuck in one gear or in limp mode
- Erratic shift timing or a dropping speedometer
Common causes
Most likely first
- Open, short, or high resistance in the input/turbine shaft speed sensor 'B' circuitLikely
- Corroded, loose, or damaged sensor connectorCommon
- Failed input/turbine shaft speed sensorCommon
- Debris on the sensor tip or a damaged tone/reluctor ringLess often
- Chafed or broken wiring in the sensor harnessLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and inspect the sensor connector and wiring for damage or corrosion.
- Check the sensor tip for metal debris and inspect the tone ring.
- Measure the sensor's resistance and signal against spec.
- Replace the input/turbine speed sensor if it's out of spec, then clear the code.
- Road-test to confirm normal shifting and a stable input-speed signal.
FAQ
Quick answers
Is it safe to drive with P2765?+
Can I just clear P2765?+
Related codes
Often seen with P2765
Read & clear P2765 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.