P0740Severity: High
P0740 – Torque Converter Clutch (Lock-up) Circuit
A fault in the torque converter lock-up clutch circuit.
What it means
The torque converter lock-up clutch that saves fuel in an automatic transmission isn't engaging properly. Ignored, it can accelerate transmission wear.
Symptoms
- RPM surging/shudder
- Increased fuel use
- Overheating
- Limp mode
Common causes
- Faulty lock-up solenoid
- Low/dirty transmission fluid
- Torque converter failure
- Wiring/connector issue
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Frequently asked questions
What does trouble code P0740 mean?
P0740 – Torque Converter Clutch (Lock-up) Circuit. The torque converter lock-up clutch that saves fuel in an automatic transmission isn't engaging properly. Ignored, it can accelerate transmission wear.
Can I drive with a P0740 code?
This code is high severity. Driving for long can damage the engine; have it checked as soon as possible.