P2745 indicates that the powertrain control module (PCM) has detected an electrical fault in the circuit for the intermediate shaft speed sensor B. This sensor provides the transmission control module with the rotational speed of the intermediate shaft, which is essential for proper shift timing.
The sensor itself may have an internal open or short, causing loss of signal to the transmission control module.
Corroded, frayed, or broken wires and a loose or contaminated connector can interrupt the sensor circuit.
A blown fuse, faulty relay, or poor ground connection can prevent the sensor from operating.
The TCM may have a defective input circuit that cannot read the sensor signal correctly.
A malfunction in the engine control module's processing of the sensor data is possible but uncommon.
In most cases the PCM is not the cause; the fault is usually the sensor, wiring, or TCM. Replace the PCM only after all other possibilities have been ruled out.
Fluid condition does not directly set P2745, but contaminated or degraded fluid can damage the sensor or its wiring over time.
The vehicle may shift erratically or enter limp mode; continued driving can lead to further transmission damage.
Use a scan tool to erase the code after confirming the repair; the code will not return if the underlying fault is corrected.