P2746 means the transmission or engine control module has seen the intermediate shaft speed sensor B signal go outside its expected range or fail to match the other speed sensors. The fault can upset shift timing, torque‑converter lock‑up, and may trigger a fail‑safe (limp‑in) mode.
Internal electrical failure of the sensor can produce a constant out‑of‑range signal or no signal at all.
Open circuits, short‑to‑ground/positive, or corroded terminals in the sensor harness can corrupt the signal.
A damaged tone wheel or improper spacing between the sensor and the wheel causes erratic or missing pulses.
Dirty, low, or incorrect fluid can lead to intermittent sensor readings and trigger the code.
Worn bearings, debris, or a damaged output shaft can affect the tone wheel’s speed and produce spurious sensor data.
A software calibration error or internal electronic failure of the control module can, in very few cases, set P2746.
Rarely. In most cases the problem is the sensor, its wiring, or fluid condition. The control module itself is an uncommon source of this fault.
The vehicle may still operate but will often enter limp‑in mode, limiting gears and reducing performance. It’s advisable to diagnose and repair the issue promptly.
Not necessarily. The code can also be caused by wiring, connectors, fluid problems, or a damaged tone wheel, so proper verification is essential.
Yes. Contaminated or insufficient fluid can cause intermittent sensor readings, leading to a range‑performance fault. Checking and correcting the fluid is a common first step.