Transmission Fluid Temperature Sensor B Circuit Range/Performance
What it means
P2741 means the transmission fluid temperature sensor B is reading outside its expected range or not tracking properly with conditions. The controller uses fluid temperature to set shift timing and torque-converter lockup, so a bad reading can change how the transmission shifts. It is a sensor performance fault, does not stop the engine from starting, and is worth fixing so the controller has accurate temperature data.
Can I keep driving? Drivable, but shift timing and torque-converter lockup may be affected because the controller cannot trust the fluid-temperature reading.
Common symptoms
What you'll notice
- Check-engine light on
- Firmer, delayed, or altered shift behavior
- Torque-converter lockup may be disabled
- Often no obvious symptom beyond the warning light
Common causes
Most likely first
- Transmission fluid temperature sensor B reading out of range or driftingLikely
- Corroded or loose connector at the sensorCommon
- Wiring resistance or intermittent connection in the sensor circuitCommon
- Contaminated fluid affecting the sensorLess often
- Faulty TCM/PCM (least likely)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and compare sensor B's temperature against sensor A or actual fluid temperature.
- Inspect the sensor connector and wiring for corrosion or high resistance.
- Check the sensor's resistance against specification at a known temperature.
- Verify the reading tracks correctly as the transmission warms up.
- Replace the temperature sensor if out of range; otherwise repair the wiring. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2741?+
Can I just clear P2741?+
Related codes
Often seen with P2741
Read & clear P2741 yourself
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