What is the P0718 fault-error code?
The P0718 fault-error code indicates a problem with the Turbine Speed Sensor (TSS) circuit, and specifically indicates that the sensor signal is outside of the normal operating range. The Turbine Speed Sensor is a very important component of the transmission system and is responsible for measuring the rotational speed of the input shaft or turbine within the transmission.
When the TSS circuit deviates from normal parameters, the Transmission Control Module (TCM) or Engine Control Module (ECM) detects this deviation and triggers code P0718.
What are the indications of P0718 fault-error code ?
When a vehicle's onboard diagnostics detects a P0718 fault-error code indicating a problem with the Turbine Speed Sensor (TSS) circuit, a variety of symptoms or indicators may occur. However, it is important to note that symptoms can vary depending on the specific conditions and severity of the problem. Here are some potential indicators:
Check Engine Light On: The most common indication of the P0718 trouble code is the check engine light on the vehicle's dashboard. The CEL illuminates when the engine control module (ECM) or transmission control module (TCM) detects a fault with the turbine speed sensor circuit.
Transmission Shifting Issues: Problems with the TSS circuit can affect the transmission’s ability to shift smoothly or accurately. You may experience erratic or harsh shifting, delayed shifting, or an inability to shift into certain gears.
Transmission Slippage: A faulty TSS circuit can cause the transmission to slip, where the transmission is unable to properly maintain power and momentum, especially under load or during acceleration.
Engine Protection Mode: In some cases, the TCM may place the transmission in a fail-safe or limp mode to protect it from further damage. This mode typically limits the transmission to a single gear, such as second or third, and limits the vehicle speed to prevent further problems.
Reduced Fuel Efficiency: Problems with the TSS circuit can impact transmission efficiency and result in reduced fuel efficiency over time due to poor transmission performance.
Other Transmission-Related Problems: Depending on the severity of the problem and the vehicle's specific transmission system, other transmission-related symptoms may occur, such as abnormal noises, rough shifting, or transmission hesitation.
What could be the causes of the P0718 fault-error code ?
The P0718 fault-error code indicates a problem with the Turbine Speed Sensor (TSS) circuit in the vehicle's transmission system. Several possible causes can trigger this error code, including:
Faulty Turbine Speed Sensor (TSS): A faulty or failed Turbine Speed Sensor is one of the most common causes of code P0718. The sensor can fail due to internal electronic issues, mechanical damage, wear and tear, or corrosion.
Wiring Issues: Problems with the wiring harness connecting the Turbine Speed Sensor to the Transmission Control Module (TCM) or Engine Control Module (ECM) can cause code P0718. This could include damaged wiring, broken connections, loose terminals, or corroded connectors.
Faulty Connectors or Terminals: Corrosion, contamination or damage to connectors or terminals associated with the TSS circuitry can prevent proper signal transmission and lead to code P0718.
Mechanical Issues: Mechanical issues within the transmission itself, such as a damaged or worn input shaft, turbine, or related components, can indirectly affect the operation of the Turbine Speed Sensor and cause code P0718.
Faulty TCM or ECM: In rare cases, a fault in the TCM or ECM itself can cause code P0718. This can be due to internal electronic issues or communication problems within the module.
Other Electrical Issues: Other electrical issues such as shorts, opens, or voltage irregularities in the vehicle's wiring system can disrupt the signal transmission from the TSS and trigger code P0718.
What Steps Should Be Followed to Resolve P0718 fault-error code ?
To resolve a P0718 fault-error code that indicates a problem with the Turbine Speed Sensor (TSS) circuit, you must follow a systematic approach to diagnose and repair the underlying issue. Here are the steps you should follow:
Read Code: Use an OBD-II scanner to retrieve trouble code P0718 and any other related codes stored in the vehicle's Engine Control Module (ECM) or Transmission Control Module (TCM). Write down any codes present as they may provide additional information about the problem.
Inspect Turbine Speed Sensor (TSS): Locate the Turbine Speed Sensor on the transmission and inspect for any signs of damage or wear. Check the sensor for loose connections, corrosion, or physical damage.
Check Wiring and Connectors: Check the wiring harness connecting the TSS to the TCM or ECM for any damage, breaks or loose connections. Check the connectors and terminals for corrosion or contamination.
Test Turbine Speed Sensor Voltage: With the engine running and the transmission in gear, use a multimeter to test the voltage output of the TSS. Compare the measured voltage readings to the specifications stated in the vehicle's service manual.
Inspect Transmission Control Module (TCM): If necessary, check the transmission control module (TCM) for any internal malfunctions or communication problems with the TSS circuit. Make sure the TCM is receiving and transmitting signals properly.
Repair or Replace Faulty Components: Depending on your diagnosis, repair or replace any faulty components identified during inspection, such as the Turbine Speed Sensor, wiring harness, connectors, or TCM.
Clear Codes and Test Drive: After completing repairs, clear any trouble codes stored in the ECM or TCM using an OBD-II scanner. Take the vehicle for a test drive to ensure the P0718 code does not return and the transmission is functioning properly.
Recurrence Monitor: Pay attention to vehicle performance and check for a recurrence of code P0718. If the code returns, recheck all components and wiring to identify any issues you may have missed.
What Are the Long-Term Effects of the P0718 fault-error code ?
The long-term effects of a P0718 fault-error code, which indicates a problem with the Turbine Speed Sensor (TSS) circuit, can vary depending on a variety of factors, including the underlying cause of the problem, the duration of the problem, and how it is addressed. Some potential long-term effects to consider include:
Transmission Damage: The Turbine Speed Sensor (TSS) plays a crucial role in proper transmission operation by providing data on rotational speed. If a TSS circuit problem is not addressed immediately, it can lead to improper transmission operation, including delayed or harsh shifting, which can accelerate wear and tear on transmission components over time. Long-term operation with inaccurate speed readings can result in transmission damage.
Transmission Overheating: A faulty TSS circuit can cause improper transmission operation, including failure to properly engage certain gears or failure to provide proper torque converter lock-up. This can cause excessive friction and heat buildup in the transmission, which can eventually lead to overheating. Prolonged transmission overheating can damage internal components and lead to transmission failure.
Reduced Fuel Efficiency: Problems with the TSS circuit can affect transmission efficiency and cause reduced fuel efficiency over time due to poor transmission performance. Incorrect speed readings can lead to incorrect shift timing, increased slippage, and higher fuel consumption.
Transmission Slippage: Faults in the TSS circuit can cause the transmission to slip, where the transmission is unable to properly maintain power and momentum, especially under load or during acceleration. Continued slippage can cause further damage to transmission components over time.
Safety Concerns: Transmission issues such as delayed or harsh shifting can affect a vehicle's drivability and safety. Erratic shifting behavior can compromise a vehicle's handling and responsiveness, potentially leading to unsafe driving conditions and an increased risk of accidents.
In general, it is very important to address a P0718 trouble code immediately to prevent any potential long-term effects on the vehicle's transmission, driveability, fuel efficiency, and safety. Ignoring the problem or delaying repairs can lead to more significant problems and higher repair costs in the future. If you encounter a P0718 trouble code, it is recommended that the vehicle be diagnosed and repaired by a qualified mechanic or automotive technician as soon as possible.
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