What Does P1745 Mean?
The transmission control module has detected an abnormal electrical signature from the torque converter clutch circuit, indicating improper operation. This code uses inductive signature analysis to detect mechanical or electrical anomalies in TCC engagement.
Common Causes
35%
Internal torque converter clutch mechanical failure
30%
Failing TCC solenoid with abnormal current draw
20%
Worn or damaged torque converter clutch friction material
10%
Contaminated transmission fluid affecting clutch operation
5%
Electrical noise or interference in TCC circuit
Diagnostic Steps
1
Step 1: Monitor TCC solenoid current draw and compare to specifications during engagement
2
Step 2: Observe TCC slip speed and engagement characteristics during controlled test drive
3
Step 3: Check transmission fluid condition for clutch material contamination or burning
4
Step 4: Perform oscilloscope analysis of TCC solenoid current signature if equipment available
5
Step 5: Test torque converter function with stall test and note RPM and engagement quality
Estimated Repair Cost
$300 - $2,800
Parts + labor, varies by vehicle and location
The transmission control module has detected an abnormal electrical signature from the torque converter clutch circuit, indicating improper operation. This code uses inductive signature analysis to detect mechanical or electrical anomalies in TCC engagement.
The most common cause of P1745 (Torque Converter Clutch Inductive Signature Malfunction) is: Internal torque converter clutch mechanical failure
Typical repair costs for P1745 range from $300 to $2,800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Generally safe to drive but may experience shudder during lockup, reduced fuel economy, and risk of complete torque converter failure if ignored.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1745 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission
Difficulty
Type
Manufacturer
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