Here’s a great video on diagnosing this code: This increases fuel mileage and makes the transmission operate at a higher temperature. Higher RPM on highway- If the converter is not locking, it can lead to higher RPM on the highway.It feels exactly like when you need to downshift in a manual transmission. Stutters and Stalls- This would be a symptom of the transmission locking when it should not be.Poor Gas Mileage- If the converter is not locking at speed, the engine’s RPM’s will stay higher.If it locks when it shouldn’t be, that’s where it can get dicey. If the converter stays unlocked, it can be a nuisance. In effect, this allows an automatic transmission to function like a manual transmission at certain speeds and engine loads, and eliminates all slipping from the transmission. The TCC “locks” the drivetrain, which allows for a true mechanical connection between the transmission and the engine. P0740: Torque Converter Clutch Circuit Malfunction ![]() ![]() It means that the 3‘s computer has detected that there is an issue with the torque converter clutch (TCC) solenoid circuit. P0740 is one of the most common transmission trouble codes.
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