What Does P1718 Mean?
The transmission fluid temperature sensor circuit has a fault affecting accurate temperature monitoring. Proper temperature readings are essential for transmission protection and optimal shift timing.
Common Causes
40%
Failed transmission fluid temperature sensor
30%
Damaged or shorted sensor wiring or connector
20%
Corroded or loose sensor connector pins
5%
Low transmission fluid level causing sensor exposure
5%
Failed transmission control module
Diagnostic Steps
1
Step 1: Check transmission fluid level and condition
2
Step 2: Inspect TFT sensor connector for corrosion, damage, or moisture intrusion
3
Step 3: Measure sensor resistance at various temperatures and compare to specifications
4
Step 4: Check sensor circuit voltage and ground at TCM connector
5
Step 5: Monitor live temperature data and verify sensor reading changes with engine warm-up
Estimated Repair Cost
$100 - $400
Parts + labor, varies by vehicle and location
The transmission fluid temperature sensor circuit has a fault affecting accurate temperature monitoring. Proper temperature readings are essential for transmission protection and optimal shift timing.
The most common cause of P1718 (Transmission Fluid Temperature Sensor Circuit) is: Failed transmission fluid temperature sensor
Typical repair costs for P1718 range from $100 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Transmission may not enter proper temperature-related operating modes, potentially causing overheating or poor shift quality. May result in transmission damage if driven extensively without repair.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1718 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Control System
Difficulty
Type
Manufacturer
Recommended Tools
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