P0714
UniversalTransmission Fluid Temperature Sensor Circuit Intermittent
Medium SeverityThis code indicates that the vehicle's computer (PCM) is detecting an intermittent signal from the Transmission Fluid Temperature Sensor. This irregular signal can cause the transmission to shift improperly or lead to incorrect torque converter lock-up, potentially affecting fuel economy and transmission longevity.
⚠️ Before You Begin (Safety First)
Always allow the engine and transmission to cool down completely before working on the vehicle. Disconnect the negative battery terminal before performing any electrical diagnosis or repair to prevent accidental short circuits or injury. Be aware that transmission fluid can be hot and cause burns. Use appropriate personal protective equipment.
Common Symptoms
- Erratic or harsh shifting
- Transmission remaining in a specific gear (limp mode)
- Delayed engagement of gears
- Check Engine Light illuminated intermittently
- Poor fuel economy
- Torque converter not locking up correctly
- Transmission overheating (less common with intermittent signal, but possible if PCM assumes low temp)
Common Causes
- Loose or corroded electrical connections at the Transmission Fluid Temperature Sensor or PCM
- Frayed, damaged, or shorted wiring in the sensor circuit
- Intermittent internal fault within the Transmission Fluid Temperature Sensor itself
- Dirty or contaminated transmission fluid causing sensor malfunction (less common for circuit intermittent)
- Internal transmission issues affecting sensor readings (e.g., fluid level fluctuations, valve body issues affecting local temp)
- Faulty PCM (rare but possible)
Frequently reported on: General/Universal
Diagnostic Steps
- Visually inspect the wiring harness and connectors leading to the Transmission Fluid Temperature Sensor for any signs of damage, corrosion, or looseness. Clean any corroded terminals.
- Check the transmission fluid level and condition. Ensure it is at the correct level and free from excessive contamination or burnt smell.
- Using a multimeter, test the continuity and resistance of the sensor circuit while gently wiggling the wiring to identify intermittent breaks or shorts. Compare readings to factory specifications.
- If accessible, remove the Transmission Fluid Temperature Sensor and inspect for physical damage or debris. Some sensors can be tested for resistance changes with temperature manually if safely heated.
- If all visual and basic electrical checks confirm no obvious fault, and symptoms persist, consider replacing the Transmission Fluid Temperature Sensor, as internal intermittent faults are hard to detect without substitution.
👨🔧 When to Call a Professional
If you have performed basic checks and the issue persists, or if the transmission is exhibiting severe shifting problems, it is highly recommended to consult a professional transmission specialist. Intermittent electrical faults can be complex and require advanced diagnostic equipment.
Commonly Asked Questions
Can I drive with a P0714 code?
It is not recommended to drive for extended periods with a P0714 code, especially if you experience noticeable shifting problems. Intermittent incorrect temperature readings can lead to improper transmission operation and potential long-term damage.
Where is the Transmission Fluid Temperature Sensor located?
The location varies significantly by vehicle and transmission type. It is often integrated into the valve body, part of the main wiring harness inside the transmission, or sometimes located externally on the transmission case. Consult your vehicle's service manual for the exact location.
How can I test the Transmission Fluid Temperature Sensor?
You can test the sensor by measuring its resistance across its terminals and comparing it to specified values at different temperatures. This usually requires a multimeter and access to the sensor, possibly removal. An intermittent fault is harder to catch without specialized equipment or by continuously monitoring live data.
Is P0714 always a faulty sensor?
Not necessarily. While a faulty sensor is a common cause, the 'intermittent circuit' aspect of the code suggests that wiring issues, loose connections, or corrosion in the sensor's electrical circuit are also very strong possibilities. Always check the wiring first.
Will clearing the P0714 code fix the problem?
Clearing the code will turn off the Check Engine Light, but it will not fix the underlying intermittent issue. The code is likely to return if the fault is not repaired. It's best to diagnose and fix the problem rather than just clearing the code.