P0740 Ford F-150
Torque Converter Clutch Circuit Malfunction · Powertrain Code · High
What is P0740?
The torque converter clutch (TCC) solenoid circuit has an electrical fault.
When the Ford F-150 triggers code P0740 (torque converter clutch circuit malfunction), it typically points to an issue in the powertrain system. This is a high severity code, so address it promptly to avoid further damage or safety concerns. Below you'll find the most common causes, symptoms, and repair options specific to the Ford F-150.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Ford F-150.
Common Causes on Ford F-150
- Torque converter clutch (TCC) solenoid circuit issue
- Failed TCC solenoid in the valve body (common on 6R80 and 10R80 transmissions)
- Wiring issue between TCM and the TCC solenoid
- Internal transmission valve body issue
Symptoms
- Check engine light
- Torque converter does not lock up at highway speed
- Higher RPM than normal at steady cruise
- Reduced fuel economy
- Transmission may shudder
Notes for Ford F-150
On the 6R80 transmission, a TCC shudder is a known issue — a fluid drain-and-fill with Motorcraft Mercon LV sometimes resolves mild cases.