If you’re experiencing issues with your vehicle’s transmission and have come across the diagnostic trouble code P0714, it indicates a problem with the Transmission Fluid Temperature Sensor Circuit. The code specifically points to a high input signal from the sensor, which can lead to erratic transmission behavior. However, with some basic knowledge and a few tools, you can fix this issue yourself and save on repair costs. In this article, we’ll guide you through the process of troubleshooting and repairing the Transmission Fluid Temperature Sensor Circuit.
Understanding the P0714 Code
Before diving into the troubleshooting steps, let’s understand what the P0714 code means. The Transmission Fluid Temperature Sensor (TFT sensor) is responsible for measuring the temperature of the transmission fluid. The information provided by this sensor helps the vehicle’s control module make necessary adjustments for optimal transmission performance. When the TFT sensor reports a high input signal that is out of the expected range, the PCM (Powertrain Control Module) registers the P0714 code.
Symptoms of a Faulty Transmission Fluid Temperature Sensor
A faulty Transmission Fluid Temperature Sensor can lead to various symptoms, including:
- Erratic shifting: The transmission may shift roughly or unexpectedly due to incorrect temperature readings.
- Slipping gears: You may experience the transmission slipping in and out of gear, causing a loss of power or acceleration.
- Overheating: Inaccurate temperature readings can prevent the transmission from cooling properly, potentially leading to overheating.
- Illuminated check engine light: The P0714 code triggers the check engine light to alert you of the problem.
If you notice any of these symptoms, it’s essential to address the issue promptly to prevent further damage to your vehicle’s transmission.
Diagnostic Steps
To accurately diagnose and fix the P0714 code, follow these step-by-step troubleshooting instructions:
Step 1: Gather the necessary tools and equipment
Before you start troubleshooting, gather the following tools and equipment:
- Safety goggles
- Gloves
- Multimeter
- Screwdriver set
- Replacement TFT sensor (if necessary)
- Wiring diagram for your vehicle (consult the vehicle’s repair manual)
Step 2: Locate the transmission fluid temperature sensor
The TFT sensor is typically located on or near the transmission housing. Refer to your vehicle’s repair manual or wiring diagram to locate the sensor’s exact position.
Step 3: Inspect the sensor and its wiring
Carefully inspect the TFT sensor and its wiring for any signs of damage, corrosion, or loose connections. Ensure that the wiring harness is intact and securely connected to the sensor.
Step 4: Test the sensor’s resistance
Using a multimeter set to the resistance (ohms) mode, measure the resistance of the TFT sensor. Compare the reading to the specifications provided in your vehicle’s repair manual. If the resistance is out of range, it indicates a faulty sensor that requires replacement.
Step 5: Check for voltage supply
Using the multimeter set to the voltage (volts) mode, check if the TFT sensor is receiving the proper voltage supply. Refer to the wiring diagram or repair manual to identify the appropriate terminals for testing. If there is no voltage or an inconsistent voltage supply, further investigation is needed to identify the underlying issue.
Step 6: Inspect the wiring harness
Thoroughly inspect the wiring harness for any signs of damage, such as exposed wires or frayed insulation. Repair or replace any damaged sections of the wiring harness as necessary.
Step 7: Scan for additional trouble codes
Perform a comprehensive scan of the vehicle’s OBD-II system to check for any additional trouble codes. Addressing any related codes can help ensure a complete and accurate repair.
Repairing the Transmission Fluid Temperature Sensor Circuit
Once you’ve identified a faulty Transmission Fluid Temperature Sensor or wiring issue, follow these steps to fix the problem:
Step 1: Disconnect the battery
Before starting any repair work, disconnect the negative terminal of the vehicle’s battery. This ensures your safety and prevents accidental electrical damage during the repair process.
Step 2: Remove the faulty sensor
Using the appropriate tools, carefully remove the faulty Transmission Fluid Temperature Sensor from its mounting location. Take note of the sensor’s orientation to ensure proper installation of the replacement sensor.
Step 3: Install the new sensor
Install the new Transmission Fluid Temperature Sensor by aligning it correctly with the mounting location. Gently tighten the sensor, taking care not to overtighten.
Step 4: Reconnect the battery
Once the new sensor is securely in place, reconnect the negative terminal of the vehicle’s battery. This allows the PCM to recognize the new sensor and clear any stored trouble codes.
Tips for Successful Sensor Replacement
- Always refer to your vehicle’s repair manual or wiring diagram for specific instructions and component locations.
- Take precautionary measures such as wearing safety goggles and gloves to protect yourself during the repair process.
- Double-check the orientation and alignment of the new sensor to ensure accurate readings.
- Perform a test drive after the repair to ensure the transmission is operating smoothly and the P0714 code does not reappear.
Conclusion
The P0714 code indicating a Transmission Fluid Temperature Sensor Circuit High Input can be resolved by following the troubleshooting steps outlined in this article. By diagnosing the issue correctly and replacing the faulty sensor or repairing the wiring, you can restore proper transmission functionality. However, if you’re unsure or uncomfortable with performing the repair yourself, it’s advisable to consult a professional mechanic for assistance.
FAQs
Q1: Can I drive my vehicle with the P0714 code?
A1: It’s not recommended to drive the vehicle with the P0714 code as it can lead to erratic shifting and potential transmission damage. Address the issue promptly to prevent further complications.
Q2: How much does it cost to replace a Transmission Fluid Temperature Sensor?
A2: The cost of replacing a Transmission Fluid Temperature Sensor can vary depending on the vehicle make and model. Generally, the sensor itself is relatively inexpensive, but labor costs may vary. It’s advisable to check with local repair shops or dealerships for accurate pricing.
Q3: Will the check engine light turn off automatically after fixing the P0714 code?
A3: In most cases, the check engine light will turn off automatically after fixing the underlying issue and clearing the trouble codes. However, if the light remains illuminated, you may need to use an OBD-II scanner to clear the code manually.
