P1744 - Torque Converter Clutch Solenoid Performance
The P1744 code indicates that the torque converter clutch (TCC) solenoid is not functioning properly, preventing the torque converter from locking up as commanded by the powertrain control module (PCM). This can cause the transmission to slip, overheat, and reduce fuel efficiency. The issue is often related to electrical faults, hydraulic blockages, or mechanical wear in the transmission.
01. Most Common Causes
- Faulty torque converter clutch solenoid
- Low or contaminated transmission fluid
- Wiring or connector issues in the TCC circuit
- Internal transmission mechanical failure
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission slipping or shuddering at highway speeds
- Poor fuel economy
- Transmission overheating
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Check transmission fluid level and condition; top off or replace if necessary.
Step 3: Inspect wiring and connectors to the TCC solenoid for damage or corrosion.
Step 4: Test TCC solenoid resistance and operation using a multimeter or scan tool.
Step 5: Perform a transmission pressure test to verify hydraulic function.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause transmission overheating and further damage. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, depending on whether the solenoid alone needs replacement or if internal transmission work is required.