Description of the P0718 fault code.
OBD2 Error Codes

P0718 Unstable / intermittent signal in the turbine (torque converter) speed sensor “A” circuit

26.05.2022 /

P0718 – OBD-II Trouble Code Technical Description

Trouble code P0718 indicates an erratic/intermittent signal in the turbine (torque converter) speed sensor A circuit.

What does trouble code P0718 mean?

Trouble code P0718 indicates a problem with the turbine (torque converter) speed sensor. This sensor measures the rotation speed of the turbine in an automatic transmission. If the signal coming from this sensor is unstable or intermittent, it may indicate a problem with the sensor circuit or the sensor itself.

Fault code P0718.

Possible reasons

Some possible causes of the P0718 trouble code:

  • Turbine speed sensor malfunction: The sensor itself may be damaged or malfunction.
  • Wiring problems: Breaks, corrosion or interruptions in the electrical circuit connecting the turbine speed sensor to the transmission control module.
  • Transmission Control Module (TCM) malfunction: Problems with the module itself, which processes information from the turbine rotation speed sensor.
  • Connection problems: Incorrect or loose connections between the turbine speed sensor, wiring and transmission control module.
  • Lack of oil in the transmission: Low transmission fluid levels can cause problems with the turbine speed sensor.
  • Mechanical problems in the transmission: Improper turbine operation or other mechanical problems in the transmission can cause erroneous signals from the turbine speed sensor.

To accurately determine the cause, it is necessary to diagnose the car using specialized equipment.

What are the symptoms of a fault code? P0718?

Some possible symptoms for trouble code P0718:

  • Unusual transmission behavior: The automatic transmission may be unstable, shift too early or too late, or shift harshly.
  • Increased fuel consumption: Due to incorrect gear shifts or insufficient transmission efficiency.
  • Check Engine Light Illuminates: Trouble code P0718 can cause the Check Engine light to turn on on your dashboard.
  • Speed ​​and acceleration problems: The vehicle may experience slow acceleration or problems with power delivery due to incorrect gear shifts.
  • Unexpected gear changes: The transmission may randomly shift into other gears without driver intervention.
  • Gaps in transmissions: Gear skipping or incorrect engagement may occur due to errors in the transmission.

It is important to note that specific symptoms may vary depending on the specific model and condition of the vehicle.

How to diagnose a fault code P0718?

The following steps are recommended to diagnose DTC P0718:

  1. Checking error codes: You should first use a diagnostic scanner to read all error codes in the engine and transmission control module. This will help determine if there are other related problems that may be affecting the transmission's performance.
  2. Checking the transmission fluid: Check the level and condition of the transmission fluid. Low levels or contaminated fluid can cause problems with the transmission and turbine speed sensor.
  3. Checking electrical connections: Check all electrical connections associated with the turbine speed sensor and transmission control module for corrosion, interruptions, or damage.
  4. Checking the sensor itself: Check the turbine speed sensor for damage or malfunction.
  5. Checking for mechanical problems: Inspect the turbine and other transmission components for mechanical problems that could affect the operation of the turbine speed sensor.
  6. Additional tests: In some cases, additional tests may need to be performed, such as electrical resistance testing or transmission control module testing.

Diagnostic errors

When diagnosing DTC P0718, the following errors may occur:

  • Skip checking electrical connections: Some technicians may skip checking electrical connections or not pay due attention to their condition. This may result in overlooked problems with wiring or connections that may be corroded or damaged.
  • Limited diagnostics: The error may lie in limited diagnostics, when all the necessary tests are not performed or other factors affecting the operation of the turbine speed sensor are not taken into account.
  • Incorrect interpretation of results: Some technicians may misinterpret diagnostic results or misdiagnose the problem, which may result in incorrect repair recommendations.
  • Instability of diagnostic equipment: Some problems may be due to instability of the diagnostic equipment or its incorrect calibration, which can lead to incorrect results.
  • Problems with the sensor itself: If possible problems with the turbine speed sensor itself are not taken into account, then you may miss the opportunity to replace it if necessary.

It is important to diagnose the system using reliable equipment and follow the manufacturer's recommendations for diagnosis and repair.

How serious is the fault code? P0718?

Trouble code P0718 is serious because it indicates a problem with the turbine speed sensor in the vehicle's transmission. This sensor plays an important role in the correct operation of the automatic transmission, as it provides information about the speed of rotation of the turbine, which is necessary for correct gear shifting and adaptation of engine operation.

If the P0718 code is ignored or not given proper attention, it can cause serious transmission problems. Improper shifting can cause increased wear on transmission parts, poor fuel economy, loss of power, and even transmission failure. In addition, the appearance of this code may mean that the vehicle will not pass a technical inspection (MOT), which can lead to fines and problems with vehicle registration.

Therefore, when trouble code P0718 appears, it is recommended to have a qualified auto mechanic diagnose and repair it as soon as possible to prevent more serious transmission problems and maintain the reliability and safety of your vehicle.

What repair will help eliminate the code? P0718?

Trouble code P0718 may require several steps to resolve depending on the cause of the problem. The following are possible repair measures:

  1. Replacing the turbine speed sensor: If the turbine speed sensor is identified as faulty, it should be replaced with a new one. This is one of the most common repair options for code P0718.
  2. Checking and repairing electrical connections: Check all electrical connections associated with the turbine speed sensor for corrosion, interruptions, or damage. If necessary, repair or replace the wiring.
  3. Diagnostics and repair of other transmission components: The reason may be related not only to the turbine speed sensor, but also to other components of the transmission. Therefore, carry out additional diagnostics and, if necessary, replace or repair other components.
  4. Transmission control module firmware: Sometimes problems can arise due to errors in the transmission control module software. In this case, a firmware or software update may be required.
  5. Consultation with professionals: If you are unsure of your skills or do not have the necessary equipment, it is better to contact a professional auto mechanic or service center for diagnosis and repair.

After completing the repair and eliminating the cause of the malfunction, it is recommended to reset the error code using a diagnostic scanner and conduct a test drive to check the operation of the transmission.

What is P0718 Engine Code [Quick Guide]

P0718 – Brand-specific information

Trouble code P0718 can be common for different brands of cars, however, repair details and decoding may vary depending on the manufacturer and model of the vehicle, decoding the P0718 code for several popular car brands:

It is important to clarify information on the specific make and model of the car to more accurately determine the problem and repair.

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