What Does P1743 Mean?
The transmission control module has detected an open circuit or short circuit in the torque converter clutch solenoid valve circuit. This is an electrical fault preventing proper control of the TCC solenoid.
Common Causes
40%
Failed torque converter clutch solenoid valve
30%
Short or open circuit in TCC solenoid wiring
15%
Corroded or damaged transmission connector pins
10%
Transmission fluid contamination causing solenoid failure
5%
TCM internal driver circuit failure
Diagnostic Steps
1
Step 1: Measure resistance of TCC solenoid valve (typically 15-30 ohms when cold)
2
Step 2: Check for continuity and shorts to ground/power in solenoid circuit wiring
3
Step 3: Inspect transmission connector for oil intrusion, corrosion, or bent pins
4
Step 4: Monitor solenoid command vs actual response with scan tool
5
Step 5: If internal solenoid failure suspected, drop transmission pan and inspect/replace solenoid
Estimated Repair Cost
$200 - $900
Parts + labor, varies by vehicle and location
The transmission control module has detected an open circuit or short circuit in the torque converter clutch solenoid valve circuit. This is an electrical fault preventing proper control of the TCC solenoid.
The most common cause of P1743 (Torque Converter Clutch Solenoid Valve Open or Short) is: Failed torque converter clutch solenoid valve
Typical repair costs for P1743 range from $200 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but torque converter will not lock up, resulting in poor fuel economy, increased transmission temperatures, and potential long-term transmission damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1743 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission
Difficulty
Type
Manufacturer
Recommended Tools
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