P2744 means the powertrain control module has detected an intermittent signal from the transmission fluid temperature (TFT) sensor “B” circuit. The PCM expects a stable voltage or resistance that corresponds to fluid temperature, but the reading drops in and out or jumps unpredictably. This can affect shift timing, torque-converter lockup, and overheating protection strategies.
The sensor element or its internal wiring can develop intermittent resistance or open-circuit as it heats up or vibrates. This is the most common root cause of an intermittent circuit code.
Loose, corroded, or damaged terminals, chafed wires, or a poor harness connection to the sensor can cause the signal to cut in and out, especially with engine movement, heat, or moisture.
On units where the sensor is inside the transmission or valve body, the internal harness, bulkhead connector, or solenoid pack wiring can flex and fatigue, producing intermittent contact.
Burned, degraded, or conductive contamination on the sensor tip can disturb its thermal response or create erratic readings, though it more often sets rationality or range codes.
A PCM issue is possible but uncommon; it should only be considered after the sensor, wiring, and connectors have been ruled out.
Usually not. This code is most often caused by a failing TFT sensor B, a loose or corroded connector, or a wiring fault. PCM failure is a last-resort diagnosis after the sensor and circuit have been thoroughly tested.
It is a second temperature sensor, often located in the valve body, solenoid pack, or transmission pan, separate from sensor A. It gives the PCM an additional fluid-temperature input for shift and cooling control.
Short trips are generally okay if the transmission shifts normally, but avoid heavy loads or towing. An intermittent false reading can lead to harsh shifting or overheating protection modes without warning.
An intermittent code typically points to a connection or component that fails only under heat, vibration, or movement, such as a cracked sensor element, loose terminal, or flexing internal harness.