P1718 – OBD-II DTC

OBD-II DTC P1718 – TFT Sensor In Range Failure Low Value

DTC P1718 meaning

DTC P1718 refers to a diagnostic trouble code indicating a “Transmission Fluid Temperature (TFT) Sensor In Range Failure Low Value.” This code is triggered when the Engine Control Module (ECM) detects that the TFT sensor is providing a reading that is lower than the expected range. The TFT sensor is crucial for monitoring the temperature of the transmission fluid, which is essential for optimal transmission performance.

DTC P1718 symptoms

Common symptoms associated with DTC P1718 may include:

• Transmission overheating
• Erratic shifting or harsh shifts
• Decreased fuel efficiency
• Check Engine Light illuminated
• Transmission slipping or failure to engage

DTC P1718 causes

Several factors can lead to the triggering of DTC P1718, including:

• Faulty transmission fluid temperature sensor
• Wiring issues, such as shorts or open circuits
• Corroded or loose electrical connections
• Low transmission fluid levels
• Faulty Engine Control Module (ECM)

DTC P1718 seriousness

DTC P1718 can be serious as it may indicate that the transmission is not operating within its optimal temperature range. If left unaddressed, this can lead to:

• Increased wear and tear on transmission components
• Potential transmission failure
• Safety risks due to erratic vehicle behavior

How to diagnose DTC P1718

To diagnose DTC P1718, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the P1718 code.
2. Inspect the transmission fluid level and condition.
3. Check the wiring and connectors related to the TFT sensor for damage or corrosion.
4. Test the TFT sensor using a multimeter to ensure it is functioning correctly.
5. Examine the ECM for any faults or updates that may be necessary.

How to fix DTC P1718 step-by-step instructions

To fix DTC P1718, follow these steps:

1. Check and top off the transmission fluid if low.
2. Repair or replace any damaged wiring or connectors related to the TFT sensor.
3. Replace the faulty TFT sensor if testing indicates it is not functioning properly.
4. Clear the DTC using an OBD-II scanner.
5. Test drive the vehicle to ensure the code does not return and that the transmission operates smoothly.

How to erase DTC P1718

To erase DTC P1718, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the “Erase Codes” or “Clear DTCs” option on the scanner.
4. Confirm the action to clear the trouble codes.
5. Disconnect the scanner and start the vehicle to check if the code reappears.

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.