Transmission Fluid Temperature Sensor Circuit Malfunction
Your transmission's temperature sensor isn't sending the right signal to the engine computer, like a broken thermometer that can't tell if the fluid is hot or cold. The transmission control module can't adjust shift timing and fluid pressure properly without this data.
The ECM monitors resistance changes from the transmission fluid temperature (TFT) sensor to calculate fluid temperature. The sensor should produce a voltage signal that changes predictably as temperature rises or falls. Out-of-range voltage, open circuits, or shorts trigger the P0711 fault.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Sensor Voltage | 0.5–4.5V depending on temp range | <0.1V or >4.9V (open/short circuit) |
| Fluid Temperature Logic | –40°C to +150°C mapped to sensor signal | Signal implausibly jumps or stays fixed; no correlation to engine load |
Code P0711 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0711 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.