The P2765 code indicates a malfunction in the electrical circuit of the 'B' input/turbine speed sensor. This sensor measures the rotational speed of the transmission's input shaft or torque converter turbine, providing critical data for shift timing and torque converter lockup. A circuit fault can lead to erratic shifting, transmission slippage, or limp mode.
The sensor itself may have failed internally due to heat, vibration, or age, causing an open or short circuit.
Moisture intrusion, dirt, or corrosion at the connector can create high resistance or intermittent contact.
Chafed, broken, or shorted wires between the sensor and the TCM/PCM can disrupt the signal.
Insufficient fluid level or degraded fluid can affect sensor operation and lead to erratic readings.
A module failure is rare but can misinterpret sensor signals. This should be considered only after all other causes are ruled out.
It is not recommended, as the transmission may shift erratically or enter limp mode, potentially causing further damage.
No, the input sensor measures speed before the gearset, while the output sensor measures after. They serve different purposes.
Not necessarily. Wiring or connector issues can cause the same code. Proper diagnosis is essential to avoid unnecessary parts replacement.
It is extremely rare. The PCM is often misdiagnosed for this code. The sensor, wiring, or connector are far more likely culprits.