P2743Transmission
Transmission Fluid Temperature Sensor B Circuit High
P2743 means the transmission fluid temperature sensor B circuit signal is higher than expected, often from an open circuit or a failed sensor.
🚗 Drivable short term but get it checked. A high signal misreports fluid temperature.
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🎯 Top Causes, Ranked by Likelihood
#1Open in wiring$100-$350
An open circuit reads high.
#2Faulty sensor B$100-$350
An open sensor element reads high.
#3Corroded connector$80-$250
Corrosion opens the circuit.
#4TCM fault$500-$1200
The reading circuit has failed high.
🩺 Common Symptoms
- Check engine light
- Harsh or erratic shifts
- Incorrect temperature reading
- Lockup issues
💰 Repair Cost: DIY vs Shop
📋 Free OBD2 Code Cheat Sheet
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🔧 How to Diagnose P2743
1Scan live data for an implausibly high temperature
2Inspect wiring for opens
3Test sensor resistance
4Replace the sensor if open
❓ Frequently Asked Questions
Can I drive with P2743?
Yes briefly, but shift control may be affected, so get it diagnosed.
What does circuit high mean?
The signal voltage is higher than expected, usually from an open circuit.
How much to fix P2743?
Usually $150-$500 including a sensor and labor.
🔗 Related Codes
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