A P0713 code in your 2020 Ford Explorer indicates that the transmission fluid temperature sensor circuit is showing higher voltage than expected. This is the opposite of P0712—instead of a short to ground, the circuit appears open or has high resistance, causing the PCM to see what it interprets as an extremely hot temperature reading.
Understanding High Circuit Voltage
The TFT sensor's resistance changes with temperature. When the circuit is open or has very high resistance, voltage at the measurement point rises because minimal current flows. The PCM interprets this high voltage as extreme heat, triggering P0713 and potentially activating transmission protection modes.
Common Causes
An open circuit in the TFT sensor wiring is the primary cause. This includes broken wires, disconnected connectors, or corroded terminals. The TFT sensor may have failed open internally. Loose pin connections at the sensor or PCM connector create intermittent opens. Damage to the transmission connector from impact or corrosion causes circuit issues.
Impact on Your Explorer
When the PCM believes the transmission is overheating, it may enter a protective mode. This includes limiting torque converter lockup, adjusting shift pressures, or even reducing engine power. The transmission may feel sluggish or refuse to shift normally. The check engine light illuminates with P0713 stored.
Diagnostic Approach
Using Ford IDS/FDRS, monitor TFT readings. If it shows extremely high temperatures when the transmission is actually cold or normal, the circuit has an open condition. Check the sensor connector for secure connection. Test sensor resistance—it should decrease as temperature increases. If resistance is infinite (open), the sensor has failed. Check wiring continuity if the sensor tests good.