P0713
UniversalTransmission Fluid Temperature Sensor Circuit High Input
Medium SeverityThe P0713 code indicates that the engine computer (PCM) is receiving an abnormally high voltage signal from the Transmission Fluid Temperature Sensor. This high input typically suggests an electrical fault within the circuit, or that the sensor itself is faulty, incorrectly reporting the transmission fluid as being very cold. Consequently, the transmission may not shift correctly, leading to performance issues and potential long-term damage if ignored.
⚠️ Before You Begin (Safety First)
Always allow the vehicle to cool down before working on any transmission components, as transmission fluid can be very hot. Wear appropriate personal protective equipment, including gloves and eye protection. When checking electrical connections, ensure the vehicle's battery is disconnected to prevent electrical shock or damage to the vehicle's electrical system.
Common Symptoms
- Check Engine Light illuminated
- Harsh or erratic transmission shifts
- Delayed shifts
- Transmission stuck in 'limp mode' (higher gear to protect transmission)
- Poor fuel economy
- Overheating transmission (in some cases, if the sensor is misreporting cold fluid)
Common Causes
- Faulty Transmission Fluid Temperature Sensor
- Wiring issues (open, short, or corrosion) in the sensor circuit
- Poor electrical connection at the sensor or PCM
- Low transmission fluid level
- Internal transmission mechanical failure (less common for this specific code, but can contribute)
- Faulty Powertrain Control Module (PCM)
Frequently reported on: General/Universal
Diagnostic Steps
- Check transmission fluid level and condition. Ensure it's at the correct level and not burnt or discolored.
- Locate the Transmission Fluid Temperature Sensor. Its location varies by vehicle, but it's typically inside the transmission pan or on the valve body.
- Visually inspect the sensor's wiring harness and connector for any signs of damage, corrosion, or loose connections.
- If accessible, disconnect the sensor and use a multimeter to test the sensor's resistance (refer to your vehicle's service manual for specifications) and verify voltage at the connector.
- If the sensor tests faulty or if the wiring is compromised, replace the Transmission Fluid Temperature Sensor or repair the wiring as needed.
- Clear the P0713 code with an OBD-II scanner and test drive the vehicle to confirm the repair.
👨🔧 When to Call a Professional
If after inspecting the wiring and replacing the Transmission Fluid Temperature Sensor the code persists, or if you notice severe transmission performance issues like slipping or harsh engagement, it's advisable to seek professional diagnostic help. There could be deeper internal transmission issues or a problem with the Powertrain Control Module (PCM) itself.
Commonly Asked Questions
What does 'High Input' mean for a sensor code?
For a sensor, 'High Input' typically means the PCM is receiving a voltage signal that is above the expected range. In the case of a temperature sensor, a high voltage usually indicates a very low temperature reading or an open circuit.
Can I drive with a P0713 code?
While you might be able to drive, it's not recommended for extended periods. The transmission may operate with incorrect shift patterns, leading to accelerated wear, poor fuel economy, and potential transmission damage. It's best to diagnose and repair it promptly.
Is the Transmission Fluid Temperature Sensor difficult to replace?
The difficulty varies significantly depending on the vehicle's make and model. Some sensors are external and easily accessible, while others are located inside the transmission pan, requiring fluid drainage and pan removal. Always consult your vehicle's repair manual.
Will a P0713 code cause my transmission to overheat?
Not directly. A high input usually means the sensor is reporting very cold fluid. However, if the PCM believes the fluid is colder than it actually is, it might prevent the torque converter from locking up properly or adjust shift points incorrectly, which *could* indirectly contribute to increased transmission heat over time due to inefficiency.
Do I need to replace the transmission fluid when replacing the sensor?
If the sensor is located inside the transmission pan, you will need to drain some or all of the transmission fluid to access it. In this case, it's an excellent opportunity to replace the fluid and filter as part of regular maintenance.