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

When is the code detected?

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

P0778 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).

P0778 Information for specific makes

P0778 ACURA
P0778 AUDI
P0778 CHRYSLER
P0778 DODGE
P0778 HONDA
P0778 INFINITI
P0778 JEEP
P0778 LEXUS
P0778 MAZDA
P0778 MITSUBISHI
P0778 NISSAN
P0778 SATURN
P0778 SCION
P0778 SUBARU
P0778 TOYOTA
P0778 VOLKSWAGEN