P0740: Torque Converter Clutch Circuit Malfunction
The torque converter lockup clutch isn't working properly.
Green, yellow, red: three ways P0740 can look
The same code can be a quick fix or a reason to pull over. Match your situation to the closest example.
Keep an eye on it
No shudder, set once.
Schedule a repair
Shudder or worse economy. Get it checked; a fluid service sometimes helps.
Stop and get help
Transmission overheating or slipping. Stop driving.
Symptoms you might notice
- Shudder at highway speeds
- Worse fuel economy
- Overheating transmission
Common causes, cheapest first
- Low or worn fluid
- Failing TCC solenoid
- Worn torque converter
- Wiring problem
What you can check before calling
- Note shudder around 40-50 mph
A code points to a system, not a part. Replacing parts based on the code alone is how people spend money without fixing the problem. Testing confirms the cause first.
Want the full story? Read our guide: Do you really need a transmission fluid change?.
Generic codes (second character 0) mean the same thing on every vehicle. Some manufacturers add their own details, so check service information for your exact vehicle.
More transmission codes
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does P0740 mean?
P0740 means "Torque Converter Clutch Circuit Malfunction". The torque converter lockup clutch isn't working properly.
Can I drive with code P0740?
It depends on what the vehicle is doing. Green: No shudder, set once. Yellow: Shudder or worse economy. Get it checked; a fluid service sometimes helps. Red: Transmission overheating or slipping. Stop driving.
What causes P0740?
The most common causes are: low or worn fluid; failing TCC solenoid; worn torque converter.
Is P0740 a serious code?
It can be. Transmission overheating or slipping. Stop driving.
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