What does code P2742 mean?

Q: What does code P2742 mean?

Transmission Fluid Temperature Sensor 'B' Circuit Low. P2742 indicates that the transmission fluid temperature sensor 'B' circuit is reporting a voltage lower than the manufacturer's expected range, which the transmission control module (TCM) interprets as an excessively low temperature signal or a short to ground. The TCM sets this code when the sensor signal voltage stays below a calibrated threshold for a set period, often affecting shift scheduling and torque converter clutch strategy.

DTC codes / P27xx · Transmission / P2742

P2742Transmission Fluid Temperature Sensor 'B' Circuit Low

P2742 indicates that the transmission fluid temperature sensor 'B' circuit is reporting a voltage lower than the manufacturer's expected range, which the transmission control module (TCM) interprets as an excessively low temperature signal or a short to ground. The TCM sets this code when the sensor signal voltage stays below a calibrated threshold for a set period, often affecting shift scheduling and torque converter clutch strategy.

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.