TFT Sensor In Range Failure High
The transmission fluid temperature sensor is reading a value higher than expected, like a thermometer stuck showing hotter than it actually is. The ECU thinks the fluid is overheating when it may not be.
The ECU monitors voltage output from the TFT sensor, which should decrease as temperature increases. When the voltage remains high (indicating low resistance/high temperature), the ECU triggers a fault if the reading exceeds the maximum threshold despite normal operating conditions.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| TFT Sensor Voltage | 0.5–4.5V (operating range) | Voltage indicates >250°F when actual temp is normal |
| TFT Resistance | Decreases with temperature rise | Stuck high resistance or open circuit detected |
Code P1724 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, P1724 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.