What Does P1744 Mean?
The torque converter clutch is mechanically or electrically stuck in the disengaged (off) position and cannot lock up. This prevents proper torque converter operation during cruise conditions.
Common Causes
35%
Stuck or failed torque converter clutch solenoid valve
25%
Mechanical failure inside torque converter
20%
Blocked or restricted transmission fluid passages
15%
Low or contaminated transmission fluid
5%
Failed transmission pressure control valve
Diagnostic Steps
1
Step 1: Check transmission fluid level and condition for contamination or burning
2
Step 2: Monitor TCC slip speed with scan tool during highway cruise to confirm lockup failure
3
Step 3: Command TCC solenoid on/off with bidirectional controls and observe response
4
Step 4: Perform transmission pressure tests at TCC apply circuit
5
Step 5: Drop pan and inspect solenoid, valve body, and filter for debris or damage
Estimated Repair Cost
$250 - $2,500
Parts + labor, varies by vehicle and location
The torque converter clutch is mechanically or electrically stuck in the disengaged (off) position and cannot lock up. This prevents proper torque converter operation during cruise conditions.
The most common cause of P1744 (Torque Converter Clutch System Stuck in Off Position) is: Stuck or failed torque converter clutch solenoid valve
Typical repair costs for P1744 range from $250 to $2,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but will experience significantly reduced fuel economy and increased transmission operating temperatures, potentially leading to transmission failure if driven extensively.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1744 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission
Difficulty
Type
Manufacturer
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