P0740
Medium SeverityTorque Converter Clutch Circuit
Transmission System
What Does P0740 Mean?
Fault in the torque converter clutch (TCC) solenoid circuit.
Common Fix
Replace TCC solenoid
Estimated Cost (DIY)
$30 - $100
Symptoms
- ⚠️Slight shudder at highway speed
- ⚠️Reduced fuel economy
- ⚠️Check engine light
Common Causes
Failed TCC solenoidlikely
Wiring issuepossible
Worn torque converterpossible
How to Diagnose P0740
- 1Check TCC solenoid resistance
- 2Check wiring to transmission
- 3Scan for related codes
- 4May need solenoid replacement
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Frequently Asked Questions
- What is the torque converter clutch?
- The TCC locks the torque converter at highway speed for better fuel economy. It is like a clutch inside the automatic transmission.
- Can I drive with P0740?
- Yes, but fuel economy drops 2-3 MPG and you may feel a slight shudder. Not urgent but fix when convenient.