P0778 Lexus Pressure Control Solenoid B Electrical
Possible causes
– Low transmission fluid level
– Dirty transmission fluid
– Faulty line pressure solenoid ‘B’ valve
– Line pressure solenoid ‘B’ valve harness is open or shorted
– Line pressure solenoid ‘B’ valve circuit poor electrical connection
– Dirty transmission fluid
– Faulty line pressure solenoid ‘B’ valve
– Line pressure solenoid ‘B’ valve harness is open or shorted
– Line pressure solenoid ‘B’ valve circuit poor electrical connection
What about the obd code?
Engine Control Module (ECM) detectes an open or shorted condition on the solenoid circuit
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
– Transmission shift shock
– Transmission shift shock
P0778 Lexus Description
The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the Transmission Control Module (TCM).
Lexus Vehicle:Lexus ES,Lexus GS,Lexus GX,Lexus HS,Lexus IS,Lexus LFA,Lexus LS,Lexus LX,Lexus RX,Lexus RX,Lexus SC,Lexus GS350,Lexus GS450H,Lexus IS250,Lexus GX460,Lexus IS350,Lexus LS460,Lexus LS600H,Lexus LX570,Lexus RX350