Faulty or corroded wiring to the torque converter clutch or TCC solenoid.A faulty Transmission Control Module (TCM).Faulty torque converter clutch solenoid valve.Issues with the transmission valve body.Faulty sensor inhibiting proper torque converter clutch operation.The torque converter clutch won’t engage or disengage.Defective transmission converter clutch solenoid.Problem with the Powertrain Control Module, such as software that needs an update.Here’s a quick list of the potential causes: This trouble code can be triggered for numerous reasons and can differ depending on whether your car is made by Volkswagen AG, Honda motor company, Mercedes, or any other manufacturer. So when the PCM witnesses a continuous open, short to ground, or short to power in the TCC solenoid valve circuit, DTC P0740 is triggered. The PCM observes the throttle position sensor voltage, the vehicle speed, and other inputs - which helps it decide when to energize the TCC solenoid valve. The PCM regulates the solenoid by providing the ground path on the torque converter clutch solenoid valve control circuit. This solenoid valve acquires ignition voltage via the Off/On/Crank voltage circuit. The TCC solenoid valve connects to the transmission case assembly extending into the pump cover. The TCC solenoid valve, an electrical device, is used with the torque converter clutch pulse width modulation (TCC PWM) solenoid valve to control TCC application and release. How Does The Torque Converter Clutch Circuit Operate? It can also be an electrical fault with the solenoid’s circuit.įor some vehicles, the P0740 code is more telling of a mechanical problem with the transmission or torque converter. However, for the manufacturers that consider it a possible code, P0740 typically indicates that the control module (PCM or Transmission Control Module) senses an electrical fault with the torque converter clutch solenoid. It’s important to note that many vehicle manufacturers don’t list P0740 as a possible code. If there’s any abnormality in the application of the torque converter clutch, the Powertrain Control Module will set off your check engine light (malfunction indicator lamp). The Powertrain Control Module uses the torque converter clutch to optimize car performance by lowering engine RPMs, reducing transmission fluid temperature, and improving fuel economy. The error code basically means that the Powertrain Control Module (PCM) has caught some issue within the torque converter clutch (TCC) circuit (or torque converter clutch solenoid circuit). The diagnostic trouble code or DTC P0740 stands for “Torque Converter Clutch Solenoid Circuit/Open Circuit Malfunction.”
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