Transmission Fluid Temperature Sensor Circuit High
Diagnostic trouble code P0713 indicates that the Powertrain Control Module (PCM) or Transmission Control Module (TCM) has detected a high voltage signal from the Transmission Fluid Temperature (TFT) sensor circuit. This high voltage typically corresponds to an abnormally low temperature reading or an open circuit condition in the sensor or its wiring.
While the vehicle can usually still be driven, a faulty TFT sensor can cause the transmission to shift poorly or prevent torque converter lock-up, which may lead to overheating or internal damage if left unaddressed.
Common symptoms
- Illuminated Check Engine Light
- Harsh or delayed transmission shifting
- Torque converter clutch fails to engage
- Transmission may go into limp mode
- Decreased fuel economy
Likely causes
- Faulty Transmission Fluid Temperature (TFT) sensor
- Corroded or damaged wiring or connectors in the TFT sensor circuit
- Open circuit in the TFT sensor wiring
- Dirty or contaminated transmission fluid
- Internal transmission wiring harness failure
- Faulty Powertrain Control Module (PCM) or Transmission Control Module (TCM) (rare)
What to check before replacing parts
Check the transmission fluid level and condition.
Look for: Fluid that is extremely dirty, burnt, or low can cause temperature issues or affect sensor operation. Ensure the fluid is at the correct level and in good condition.
Visually inspect the wiring and connectors for the TFT sensor.
Look for: Look for broken wires, melted insulation, corrosion, or loose connections that could cause an open circuit or high resistance.
Use a scan tool to monitor the live data for the Transmission Fluid Temperature.
Look for: Check if the temperature reading is stuck at an extreme negative value (e.g., -40°F), which strongly indicates an open circuit or a completely failed sensor.
Test the TFT sensor resistance with a digital multimeter.
Look for: Compare the sensor's resistance at various temperatures to the manufacturer's specifications. Infinite resistance (OL) indicates an internally open sensor that must be replaced.
Check the reference voltage and ground at the TFT sensor connector.
Look for: With the key on and engine off, verify there is a 5-volt reference signal from the PCM/TCM and a good ground. A lack of voltage or ground points to a wiring harness or module issue.
This page explains the generic P0713 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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