P0713 Fault Code in Audi: Causes, Symptoms, and Fixes

The P0713 diagnostic trouble code (DTC) indicates that the Transmission Control Module (TCM) is receiving an abnormally high voltage signal from the Transmission Fluid Temperature (TFT) Sensor “A”.
This typically means the sensor is reporting an unrealistically high temperature, often due to an open circuit or faulty sensor.

Common Symptoms:

1.️ Check Engine Light (CEL)
2. Harsh or delayed shifting
3.️ Transmission in limp mode
4. Torque converter may not lock up
5. Incorrect temperature display (if supported)
6. Shifts too early or too late during warm-up

Common Causes:

1. Open circuit in sensor wiring
2. Unplugged or loose TFT sensor connector
3. Faulty TFT sensor (resistance too high)
4. Corroded or broken sensor terminals
5. Faulty TCM (rare)
6. Wiring harness damage or water ingress

How to Fix It:

✅ Step-by-step:
1. Read live data from the TFT sensor
– If temperature reads abnormally high (e.g., 150–300°C), it’s likely a fault
2. Inspect sensor and harness
– Check for corrosion, disconnection, or broken wires
3. Test the sensor resistance
– Use a multimeter; resistance should drop as the fluid warms up
– Very high resistance (or infinite) = open circuit
4. Replace the sensor if faulty
5. Clear the code and test drive

Where It’s Found:

1. Audi, VW (DSG)
2. BMW, Hyundai, Toyota, Honda
3. ZF 6HP/8HP automatics
4. CVT transmissions
5. Many modern automatic vehicles with adaptive shift logic