P0713 — Transmission Fluid Temperature Sensor “A” Circuit High #

Please note: The wording for Diagnostic Trouble Code P0713 may vary depending on the vehicle manufacturer.

Known Label Variations:

• Transmission Fluid Temperature Sensor “A” Circuit High Input (Generic/OEMs)
• ATF Temperature Sensor Circuit High (Toyota, Lexus)
• Transmission Oil Temperature Sensor High (Honda, Acura)
• Trans Fluid Temp Sensor A Circuit High (GM, Ford, Chrysler)
• Transmission Temperature Sensor High Voltage (Nissan, Infiniti)

Summary of DTC P0713 #

Diagnostic Trouble Code P0713 indicates that the Transmission Fluid Temperature (TFT) Sensor “A” is reporting a voltage signal to the Powertrain Control Module (PCM) or Transmission Control Module (TCM) that is higher than the expected range. The TFT sensor is responsible for monitoring the temperature of the automatic transmission fluid, which is crucial for proper shifting, lubrication, and overall transmission health. A “circuit high” condition usually means the sensor is seeing a higher-than-normal resistance, often interpreted as extremely low or implausible fluid temperature. Left unchecked, this can affect shifting quality and, in some cases, transmission protection strategies. This code is common across many makes and models, especially those with electronically controlled automatic transmissions.

Frequent Symptoms for Code P0713 #

When P0713 is present, the vehicle may exhibit a range of symptoms, from subtle to obvious. These issues often reflect the transmission’s effort to protect itself or compensate for inaccurate temperature readings. Typical symptoms include:

• Illuminated Check Engine Light (CEL) or Transmission Warning Light
• Delayed or harsh shifting
• Transmission stuck in “limp” mode (restricted gear operation)
• Poor fuel economy
• Erratic or unpredictable shifting behavior
• Transmission overheating (in rare cases, if related functions are disabled)
• Incorrect temperature reading on scan tool or dashboard (if equipped)

Probable Causes for Code P0713 (Most to Least Common) #

The root cause of P0713 can range from simple wiring issues to failed sensors or even rare module faults. Statistically, the most common culprits are:

1. Faulty Transmission Fluid Temperature Sensor “A”
2. Damaged, corroded, or disconnected sensor wiring or connector
3. Open circuit in the TFT sensor wiring harness
4. High resistance in the sensor ground circuit
5. Faulty PCM/TCM (rare)
6. Short to voltage in the signal wire
7. Transmission fluid contamination or incorrect fluid type (leading to sensor malfunction)

Step-by-Step Diagnosis for Code P0713 #

Systematically diagnosing P0713 ensures you target the real source without unnecessary parts replacement. Here’s a proven workflow:

• 1. Check for additional codes: Scan the vehicle for related transmission or electrical codes that might indicate a broader issue.
• 2. Visual inspection: Inspect the TFT sensor and its harness for broken wires, corrosion, disconnected plugs, or signs of fluid intrusion.
• 3. Verify sensor signal: Using a scan tool, monitor the transmission fluid temperature reading. If it shows implausible values (e.g., -40°F or similar), suspect an open circuit.
• 4. Test sensor resistance: With the sensor disconnected, measure its resistance with a digital multimeter. Compare to OEM specs at ambient temperature.
• 5. Check wiring continuity: Test for continuity and shorts between the sensor connector and the PCM/TCM using a multimeter.
• 6. Inspect grounds: Ensure the sensor ground path is clean and secure.
• 7. Substitute with a known-good sensor: If all else checks out, temporarily install a new or known-good sensor to confirm the diagnosis.
• 8. Re-test after repair: Clear codes and drive the vehicle to verify the issue is resolved.

Possible Repairs for Code P0713 #

Repairs directly address the identified root cause. It’s important to match the fix to the specific diagnosis rather than replacing parts blindly. Potential solutions include:

• Replacing the Transmission Fluid Temperature Sensor “A”
• Repairing or replacing damaged wiring or connectors in the sensor circuit
• Cleaning corroded sensor terminals or ground points
• Repairing open circuits or shorts in the harness
• Replacing the PCM or TCM (only if confirmed faulty after exhaustive testing)
• Flushing or replacing contaminated or incorrect transmission fluid (if this is the underlying cause)

Is It Safe to Drive with Code P0713? #

Driving with code P0713 is generally not recommended for extended periods. While the vehicle may remain drivable, the transmission is likely to enter a fail-safe or “limp” mode, limiting performance and potentially leading to further issues if ignored. Inaccurate fluid temperature readings can cause improper shift timing, increased wear, or even overheating. Short trips to a repair facility may be acceptable, but continued operation without repair could result in costly transmission damage.

Vehicles Most Commonly Affected by Code P0713 #

P0713 is prevalent in many vehicles with electronically controlled automatic transmissions, especially those using similar sensor technologies. Models most often reporting this code include:

• Toyota Camry, Corolla, Tacoma, RAV4
• Honda Accord, Civic, CR-V, Odyssey
• Ford F-150, Explorer, Escape
• Chevrolet Silverado, Malibu, Equinox
• Nissan Altima, Sentra, Pathfinder
• Chrysler/Dodge minivans and trucks
• Hyundai/Kia sedans and SUVs

Common Mistakes & Best Practices for P0713 #

Avoiding misdiagnosis saves time and money. Here are the most frequent errors and key practices to ensure an accurate repair:

• Replacing the TFT sensor without checking wiring or connector condition
• Overlooking ground circuit faults, which can mimic sensor failures
• Neglecting to check for other related DTCs that may influence diagnosis
• Using non-OEM sensors with different resistance curves, leading to repeat failures
• Skipping post-repair test drives to confirm the fix
• Not verifying transmission fluid condition and level as a possible contributing factor

Express FAQ for Code P0713 #

Quick answers to the most common questions about P0713:

• Q: Can a bad battery or alternator cause P0713?
  A: Rarely. P0713 is almost always related to the sensor, wiring, or module, but severe voltage fluctuations might cause intermittent electrical issues.
• Q: Is sensor “A” the only temperature sensor in my transmission?
  A: Not always. Some transmissions have multiple fluid temperature sensors (“A,” “B,” etc.), so ensure you’re diagnosing the correct one for your vehicle.
• Q: Will changing transmission fluid fix P0713?
  A: Only if fluid contamination damaged the sensor. Most cases require electrical or sensor repairs.