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Home >> Chrysler >> 2011 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 89 ((Transmission Control Module (TCM) - Electrical Diagnostics - As68RC Automatic Transmission)) >> Diagnosis and Testing >> P0778-Pressure Control Solenoid B Circuit >> Theory of Operation

Theory of Operation

WARNING: This page is about a different car, the 2011 RAM Pickup and 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

The Linear Solenoid 2 is used to control input pressure to the Control Valve 2. The Control Valve 2 uses the input to modulate the line pressure to the appropriate supply pressure for the clutch. The TCM monitors the Solenoid current load and resistance. If a fault is detected, the transmission will go into limp in mode, the Torque Converter Clutch (TCC) will be disabled, the limp in gear will vary based on the current gear and other conditions, and the MIL will be illuminated.

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