Transmission Fluid Temperature Sensor Circuit Range/Performance
The Powertrain Control Module (PCM) or Transmission Control Module (TCM) monitors the transmission fluid temperature (TFT) sensor to ensure it operates within an expected range. Code P0711 is set when the computer detects that the TFT sensor signal is erratic, irrational, or not changing as expected compared to engine temperature and run time.
While the vehicle can usually still be driven, an inaccurate temperature reading can prevent the transmission from entering overdrive or cause harsh shifting. Prolonged driving with improper line pressure or torque converter clutch operation can lead to internal transmission damage.
Common symptoms
- Illuminated Check Engine Light
- Harsh or delayed transmission shifting
- Inability of the transmission to shift into overdrive
- Torque converter clutch fails to engage
- Transmission enters a default or limp mode
Likely causes
- Faulty transmission fluid temperature (TFT) sensor
- Dirty, degraded, or low transmission fluid
- Damaged or corroded wiring or connectors in the TFT sensor circuit
- Internal transmission wiring harness failure
- Faulty Powertrain Control Module (PCM) or Transmission Control Module (TCM)
What to check before replacing parts
Check the transmission fluid level and condition.
Look for: Low fluid level, burnt smell, or heavily discolored fluid which can cause overheating or erratic sensor readings.
Visually inspect the external transmission wiring harness and connectors.
Look for: Frayed wires, corrosion, or loose connections at the transmission plug that could disrupt the sensor signal.
Monitor the TFT sensor data using a scan tool.
Look for: Temperature readings that are stuck, erratic, or vastly different from the engine coolant temperature after a cold soak.
Test the TFT sensor resistance with a digital multimeter.
Look for: Resistance values that are out of the manufacturer's specified range for the current ambient temperature.
Check the reference voltage and ground at the sensor connector.
Look for: A steady 5-volt reference and a solid ground; fluctuations or missing voltage indicate a wiring or module issue.
This page explains the generic P0711 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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