P0713 — Transmission Fluid Temperature Sensor « A » Circuit High

The diagnostic trouble code P0713 indicates an issue with the transmission fluid temperature sensor, specifically that its circuit is reading a higher-than-expected voltage or temperature signal. This sensor plays a critical role in managing transmission operation by monitoring the temperature of the transmission fluid, which helps the vehicle’s ECU (Engine Control Unit) optimise shifting and prevent damage. It is important to note that label variations may occur among different vehicle manufacturers, which could reference the code differently in their diagnostic systems.

System affected: Transmission Control System
Severity: Moderate; requires prompt attention
Main symptoms: Transmission slipping, harsh shifting, warning lights
Driveability: Limited — driving possible but not recommended for extended periods

Manufacturer variations for trouble code P0713

Different vehicle manufacturers may assign variations of the P0713 code or label it differently within their diagnostic protocols. These variations often reflect specific calibration or sensor designation but generally point towards the same underlying problem. Examples include:

Ford: U010F / U0701 (sometimes related, but check specific TSBs)
Chevrolet / GMC: Code 8C1
Volkswagen: P0713 (same code, different label)
BMW: Transmission fluid temp sensor circuit high / sensor A

What does trouble code P0713 mean?

In simple terms, P0713 indicates that the vehicle’s ECU has detected an abnormally high voltage or temperature reading coming from the transmission fluid temperature sensor. This sensor’s purpose is to relay the temperature of the transmission fluid to the ECU, which uses this information to control shifting and transmission cooling. When the circuit reports a high level—usually above predefined thresholds—it suggests that either the sensor or its associated wiring may be faulty.

The code is typically triggered during startup or while driving if the circuit detects a voltage outside the specified limits, usually indicating a temperature too high or a wiring malfunction. This may happen during normal operation if, for instance, the transmission overheats, but often it points to sensor circuit issues rather than actual fluid temperature.

Severity and risks of trouble code P0713

While P0713 does not usually cause immediate catastrophic failure, it is a warning sign that the transmission’s cooling system may be compromised or that sensors are malfunctioning. The potential risks include transmission overheating, which can lead to increased wear, fluid breakdown, or more serious transmission damage if left unaddressed. Additionally, the vehicle’s shifting behavior might become irregular, compromising comfort and safety.

In conclusion, the severity is Limited to moderate; the vehicle can typically be driven but should be inspected promptly to prevent further damage.

Symptoms of trouble code P0713

Recognising symptoms associated with this code can help in early diagnosis. Common signs include:

Transmission slipping or delayed shifting
Harsh or inconsistent gear changes
Illuminated transmission or warning lights on the dashboard
Overheating transmission temperature warning (if applicable)
Reduced driving performance or unusual transmission behaviour

Most likely causes of trouble code P0713

Understanding the root causes of P0713 helps in planning effective repairs. The causes are often intertwined, but some are more prevalent than others.

Faulty transmission fluid temperature sensor — The sensor itself may have failed or become damaged over time, leading to incorrect readings.
Wiring or connector issues — Corrosion, loose connections, or damaged wiring harnesses can disrupt the sensor’s circuit, causing false high readings.
Transmission control module (TCM) malfunction — The TCM or ECU may be experiencing a fault, corrupting the sensor data or misinterpreting signals.
Transmission overheating — External factors or mechanical issues could cause actual high fluid temperatures, but these are less common with sensor circuit alarms as the primary source.
Leaking or contaminated transmission fluid — Poor transmission fluid quality can contribute to temperature fluctuations and sensor errors.

How to diagnose trouble code P0713

Employing a methodical approach helps ensure an accurate diagnosis, enabling correct repairs. Here are generic, safe steps to follow:

Conduct a visual inspection of the transmission fluid level and condition, checking for leaks, contamination, or burnt smell.
Inspect and clean electrical connectors on the transmission fluid temperature sensor and wiring harness; look for corrosion, damage, or loose connections.
Use a scan tool to view live data from the sensor; verify the temperature readings and compare them with expected operating ranges.
Check wiring continuity from the sensor to the TCM or ECU using a multimeter; ensure there are no breaks or shorts.
Test the sensor with a known-good replacement if available, or swap with a functioning sensor to validate its operation.
Review transmission temperature readings during operation to determine if an actual overheating condition exists or if signals are false.

Possible repairs for trouble code P0713

Once the cause of the fault has been identified, repairs can range from simple to complex. Here are potential fixes:

Replace the transmission fluid temperature sensor — A straightforward, often DIY repair (basic)
Repair or replace damaged wiring or connectors — Requires a professional if wiring harness repair is needed
Clear corrosion or contamination from connectors — Can be done simply but ensure no further damage
Flush and replace transmission fluid — If fluid is contaminated or quality is poor (professional service recommended)
Reprogram or replace the Transmission Control Module (TCM) — Usually a professional task, especially if software or hardware faults are suspected

Vehicles commonly associated with trouble code P0713 in Europe

In Europe, vehicles from various manufacturers have reported issues related to P0713. While the same code can appear across different models, certain brands are more frequently involved. These include:

Volkswagen Group: Volkswagen, Audi, SEAT, Skoda (especially with DSG transmissions)

Ford: Various models with automatic transmissions

BMW: Older and newer models equipped with transmissions featuring electronic sensors

Peugeot / Citroën: Certain models with automatic transmissions

Frequent mistakes with trouble code P0713

Proper diagnosis and repair are crucial, but common mistakes can complicate the process. Being aware helps avoid these pitfalls:

Replacing the sensor without verifying wiring issues: Failing to check wiring can result in unnecessary sensor replacements.
Ignoring related transmission problems or overheating: Not diagnosing the actual transmission temperature may lead to incomplete repairs.
Assuming the code is a false alarm: Sometimes high sensor readings are genuine; dismissing this can cause further damage.
Failing to clear codes and verify repairs: Always clear codes after repairs and test drive to confirm the issue is resolved.

FAQ — trouble code P0713

Can this code disappear on its own?

Typically, P0713 won’t resolve spontaneously. The underlying cause, such as a wiring fault or faulty sensor, needs to be addressed before the code clears from the ECU memory.

Can I keep driving?

While it’s usually possible to drive with this code, it is advisable to limit driving and have your vehicle inspected promptly. Prolonged operation may risk transmission overheating or damage, especially if actual temperatures are high.

Why does the code return after clearing?

The code may reappear if the root cause remains unresolved—such as a damaged sensor, wiring, or actual overheating issues. Persistent symptoms and unresolved faults will cause the ECU to set the code again.