P0740 Ford Ranger
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 Ranger 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 Ranger.
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 Ranger.
Common Causes on Ford Ranger
- 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 Ranger
On the 6R80 transmission, a TCC shudder is a known issue — a fluid drain-and-fill with Motorcraft Mercon LV sometimes resolves mild cases.