Transmission Fluid Temperature Sensor A Circuit High Input
The P0713 code indicates that the powertrain control module (PCM) has detected a voltage signal from the transmission fluid temperature (TFT) sensor that is higher than the expected range, typically above 4.9 volts. This sensor is a thermistor that changes resistance with temperature; a high voltage suggests a very low resistance, often due to an open circuit, internal short, or wiring issue. The PCM uses this signal to adjust shift timing and line pressure, so an erroneous reading can cause harsh or erratic shifting.
01. Most Common Causes
- Faulty transmission fluid temperature sensor
- Open or shorted wiring in the sensor circuit
- Poor electrical connection at the sensor or PCM
- Damaged PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or delayed shifting
- Transmission stuck in limp mode or failsafe gear
- Poor fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the TFT sensor connector and wiring for damage or corrosion.
Step 3: Measure voltage at the sensor signal wire with key on; should be around 5V reference. If not, check reference voltage from PCM.
Step 4: Test sensor resistance at different temperatures (e.g., cold engine vs. hot) and compare to manufacturer specifications.
Step 5: If sensor and wiring are good, suspect PCM fault; perform a PCM reset or reprogram if necessary.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the transmission may shift erratically or enter limp mode, potentially causing further damage. Have it diagnosed promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and sensor replacement, but can be higher if wiring repairs or PCM replacement is needed.