P0712 Transmission Fluid Temperature Sensor "A" Circuit Input Low

P0712 – OBD-II Trouble Code Technical Description

Trouble code P0712 indicates the transmission fluid temperature sensor "A" circuit is low.

What does the fault code mean P0712?

Trouble code P0712 indicates a low signal in the transmission fluid temperature sensor “A” circuit. This means that the engine control module (PCM) or transmission control module (TCM) has detected that the signal from the transmission fluid temperature sensor is lower than expected. This is usually due to low transmission fluid temperature or a malfunction of the sensor itself.

Possible reasons

Possible reasons for DTC P0712:

• Transmission fluid temperature sensor malfunction: The sensor itself may be damaged or fail, resulting in incorrect temperature readings and therefore a low signal level.
• Problems with wiring or connectors: The wiring or connectors connecting the temperature sensor to the control module (PCM or TCM) may be damaged, broken, or have poor contact, resulting in a low signal level.
• Engine or transmission overheating: Overheating of the transmission fluid can cause a low temperature, which will be reflected in the temperature sensor signal.
• Control module (PCM or TCM) malfunction: Problems with the control module that interprets the signal from the temperature sensor can also cause this code to appear.
• Transmission problems: Certain problems with the transmission itself can cause low transmission fluid temperature and, as a result, a P0712 trouble code.

If the P0712 trouble code appears, it is recommended that you conduct a detailed diagnosis to determine the specific cause and then resolve it.

What are the symptoms of a fault code? P0712?

When DTC P0712 appears, the following symptoms may occur:

• Check Engine Light (MIL) on the instrument panel: The appearance of a Check Engine Light or other light indicating problems with the engine or transmission may be one of the first signs of trouble.
• Gearshift problems: A low transmission fluid temperature sensor signal can cause incorrect shifting or delays in shifting.
• Uneven engine operation: Low transmission fluid temperatures can cause the engine to run rough or even misfire.
• Increased fuel consumption: Incorrect gear shifting or uneven engine operation can lead to increased fuel consumption.
• Limp mode: In some cases, the vehicle may enter a limited operation mode to prevent further damage or accidents.
• Unusual sounds or vibrations: Low transmission fluid temperature may cause unusual sounds or vibrations while the vehicle is running.

If you notice one or more of these symptoms, it is recommended that you contact a qualified auto mechanic to diagnose and repair the problem.

How to diagnose a fault code P0712?

To diagnose DTC P0712, you can follow these steps:

1. Checking the error code: Use a scan tool to read the P0712 code from the engine control module (PCM) or transmission control module (TCM).
2. Checking the transmission fluid: Check the level and condition of the transmission fluid. The level must be within acceptable values, and the liquid must not be contaminated or overheated. If necessary, replace or top up transmission fluid.
3. Checking the temperature sensor: Using a multimeter, measure the resistance at the transmission fluid temperature sensor at various temperatures. Compare the values ​​obtained with the specifications specified in the service manual. Also check the wiring and connectors connecting the sensor to the control module for damage or poor contacts.
4. Checking the supply voltage: Check the supply voltage to the transmission fluid temperature sensor. Make sure the voltage is within the required range.
5. Checking the control module: If necessary, perform additional diagnostics on the control module (PCM or TCM) to check its operation and correct interpretation of the signal from the temperature sensor.
6. Additional diagnostics: If necessary, perform more detailed diagnostics on other transmission system components, such as solenoids, valves, and other sensors.
7. Repair or replacement of components: Depending on the diagnostic results, repair or replace faulty components such as temperature sensor, wiring, control module and other parts.
8. Clearing the error code: Once the problem has been resolved, use the diagnostic scanner again to clear the P0712 error code from the control module memory.

If you are unsure of your skills or do not have the necessary equipment to perform a diagnosis, it is recommended that you contact a qualified auto mechanic or auto repair shop.

Diagnostic errors

When diagnosing DTC P0712, the following errors may occur:

• Misinterpretation of symptoms: Some symptoms, such as changes in transmission or engine performance, may be due to problems other than a low temperature sensor signal. Misinterpretation of symptoms can lead to misdiagnosis and substitution of unnecessary parts.
• Insufficient sensor check: Incorrect measurement of resistance or voltage on a temperature sensor can lead to an incorrect conclusion about its condition. Insufficient testing of the sensor may lead to missing its actual malfunction.
• Skip additional diagnostics: Sometimes the problem may be related not only to the temperature sensor itself, but also to other components of the transmission system or electrical circuit. Skipping additional diagnostics on other components may result in incomplete resolution of the problem.
• Incorrect replacement of parts: If the temperature sensor is diagnosed as faulty, but the problem is actually with the wiring or control module, replacing the sensor will not solve the problem.
• Incorrect interpretation of diagnostic scanner data: Some values ​​obtained from the diagnostic scanner may be misinterpreted, which may lead to an incorrect diagnosis.

It is important to conduct a thorough and comprehensive diagnosis, considering all possible causes and components associated with the P0712 trouble code.

How serious is the fault code? P0712?

Trouble code P0712 is not a critical or alarm code, but it should be taken seriously as it indicates a problem with the transmission fluid temperature sensor. It is important to note the following:

• Impact on transmission operation: A low temperature sensor signal can cause the transmission to operate incorrectly, including incorrect shifting or delays in shifting. This may cause additional wear or damage to transmission components.
• Possible performance impact: Improper transmission operation can affect vehicle performance and fuel economy. Increased fuel consumption and loss of power can be the result of improper transmission operation.
• Functionality limitation: In some cases, the vehicle may enter limp mode to prevent further damage or accidents. This may limit the performance and functionality of the vehicle.

Although the P0712 code is not a trouble code in itself, it should be taken seriously due to the potential effects on transmission operation and vehicle performance. It is recommended that the problem be diagnosed and corrected as soon as possible to avoid further damage or negative impact on vehicle performance.

What repair will help eliminate the code? P0712?

The repair to resolve the P0712 code will depend on the specific cause of the code, there are several possible repair options:

1. Replacing the transmission fluid temperature sensor: If the temperature sensor is faulty or broken, it should be replaced with a new one that is compatible with your vehicle.
2. Repair or replacement of wiring and connectors: The wiring or connectors connecting the temperature sensor to the control module (PCM or TCM) may be damaged or have poor contact. In this case, repair or replacement of connections is required.
3. Checking and servicing the cooling system: If the reason for the P0712 code is due to transmission overheating, you need to check the condition and level of the transmission fluid, as well as the operation of the transmission cooling system. The cooling system may need to be serviced or parts such as the thermostat or radiator need to be replaced.
4. Updating the control module software: In some cases, the problem can be resolved by updating the control module (PCM or TCM) software to the latest version provided by the manufacturer.
5. Additional diagnostics and repairs: If the cause of the P0712 code is related to other components of the transmission or vehicle control system, more in-depth diagnosis and repair may be required.

It is important to have the problem diagnosed and repaired by a qualified auto mechanic to fix the problem correctly and effectively.

AUTOMATIC TRANSMISSION FLUID TEMPERATURE SENSOR REPLACEMENT LOCATION EXPLAINED

P0712 – Brand-specific information

Trouble code P0712 can have different meanings depending on the vehicle manufacturer, some examples of meanings for different brands:

• Toyota / Lexus: “Transmission Fluid Temperature Sensor Circuit Low Input.”
• Honda/Acura: “Transmission Fluid Temperature Sensor Circuit Low Voltage.”
• Ford: “Transmission Fluid Temperature Sensor 'A' Circuit Low Input.”
• Chevrolet / GMC: “Transmission Fluid Temperature Sensor Circuit Low Input.”
• BMW: “Transmission Fluid Temperature Sensor Circuit Low Input.”
• Mercedes-Benz: “Transmission Fluid Temperature Sensor Circuit.”
• Volkswagen/Audi: “Transmission Fluid Temperature Sensor Circuit Low Input.”
• Hyundai/Kia: “Transmission Fluid Temperature Sensor Circuit Low Input.”
• Nissan/Infiniti: “Transmission Fluid Temperature Sensor Circuit Low Input.”

These are just some examples of transcripts. It is recommended that you consult the service manual for your specific vehicle make and model for exact information about the P0712 trouble code.