What does code P2740 mean?

Q: What does code P2740 mean?

Transmission Fluid Temperature Sensor 'B' Circuit. P2740 indicates that the powertrain control module (PCM) has detected an abnormal signal on the circuit for transmission fluid temperature sensor 'B', which is typically a second temperature sensor used in some automatic transmissions. The PCM monitors the sensor's voltage or resistance and sets this code when the reading falls outside the expected range for the current operating conditions, indicating an open, short, or erratic circuit.

DTC codes / P27xx · Transmission / P2740

P2740Transmission Fluid Temperature Sensor 'B' Circuit

P2740 indicates that the powertrain control module (PCM) has detected an abnormal signal on the circuit for transmission fluid temperature sensor 'B', which is typically a second temperature sensor used in some automatic transmissions. The PCM monitors the sensor's voltage or resistance and sets this code when the reading falls outside the expected range for the current operating conditions, indicating an open, short, or erratic circuit.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaTransmission

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.