OBD-II code · Powertrain (generic, extended)
P2740 Transmission Fluid Temperature Sensor B Circuit
The second transmission fluid temperature sensor returns no usable signal.
Is it safe to drive with P2740?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen sensor element or broken sensor wire
- PossibleCorroded sensor connector
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.8–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Trans Fluid Temp Sensor B, Wiring Harness
Related codes
- P0710Transmission Fluid Temperature Sensor A Circuit
- P274ATransmission Fluid Temperature Sensor C Circuit
- P275ATransmission Fluid Temperature Sensor D Circuit
- P273DGear Shift Control Module A Supply Voltage High
- P273EGear Shift Control Module A Over Temperature
- P273FTransmission Fluid Temperature Sensor B Over Temperature Condition
- P2741Transmission Fluid Temperature Sensor B Circuit Range/Performance
- P2742Transmission Fluid Temperature Sensor B Circuit Low
- P2743Transmission Fluid Temperature Sensor B Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.