P0711: Transmission Fluid Temperature Sensor "A" Circuit Range/Performance
The transmission fluid temperature reading does not make sense compared to how long and how hard the car has been driven.
What P0711 means
The transmission fluid temperature sensor tells the transmission computer how warm the fluid is. That matters because fluid thickness changes with temperature, and the computer adjusts shift pressure, shift timing and torque converter lockup based on it. RepairPal explains that if the computer detects an incorrect signal from the sensor, it sets a code in this family, and lists sensor failure, wiring issues and module faults as causes. P0711 is the range or performance version, meaning the reading is not changing the way the computer expects, for example staying cold after a long highway drive. The sensor is often part of the internal wiring harness or mounted in the valve body, so replacement may require dropping the pan. Overheated or low fluid can also trigger it. KBB warns that once symptoms show, the car should be towed. Shops compare fluid temperature with engine coolant temperature on a scan tool, check fluid level and condition, and test sensor resistance against a temperature chart.
Common symptoms
- Check engine light on
- Harsh or delayed shifts
- Torque converter not locking up
- Transmission temperature warning light
- Lower fuel economy
Most common causes
- Faulty transmission fluid temperature sensor
- Wiring or connector problem, often inside the transmission harness
- Low or overheated fluid
- Transmission control module fault
- Transmission cooler problem
What to check yourself first
Check the transmission fluid level and smell; burnt fluid means overheating. Make sure the transmission cooler lines and radiator cooler are not leaking. Note whether shifting is harsh only when cold or only when hot.
Typical fixes and what they cost
| Fix | Typical cost | Note |
|---|---|---|
| Transmission fluid change | $294-$356 | Low or burnt fluid causes many transmission codes. Check the correct fluid type for your transmission. |
| Transmission filter and fluid service | $621-$785 | The temperature sensor often lives in the internal harness, so it may be replaced during a pan and filter service. |
| Electrical diagnosis to find a wiring or connector fault | $122-$179 | For connector or harness faults. |
| Replace transmission control module | $929-$1,006 | Only if the module is proven faulty. |
Typical US price ranges for parts and labor, not quotes. Your shop should confirm the cause with a diagnostic before replacing parts.
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Related codes
- P0700 Transmission Control System (MIL Request)
- P0740 Torque Converter Clutch Circuit/Open
- P0741 Torque Converter Clutch Circuit Performance/Stuck Off
- P0715 Input/Turbine Speed Sensor "A" Circuit
- P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)