What P0740 Means
The torque converter clutch, which locks the engine and transmission together at cruising speed for better fuel economy, isn't engaging or disengaging correctly.
Common Causes
- Faulty torque converter clutch solenoid
- Low or contaminated transmission fluid
- Wiring fault to the solenoid
- Worn torque converter
Symptoms You Might Notice
- Shuddering or vibration at cruising speed
- Higher than normal RPM at highway speed
- Reduced fuel economy
- Check engine light on
What to Check First
- 1
Check transmission fluid level and condition first
- 2
Test the torque converter clutch solenoid
- 3
If fluid and solenoid check out, the torque converter itself may need inspection by a transmission specialist