Possible causes
– Dirty transmission fluid
– Low transmission fluid level
– Faulty line pressure solenoid valve ‘A’
– Line pressure solenoid valve ‘A’ harness is open or shorted
– Line pressure solenoid valve ‘A’ circuit poor electrical connection
– Low transmission fluid level
– Faulty line pressure solenoid valve ‘A’
– Line pressure solenoid valve ‘A’ harness is open or shorted
– Line pressure solenoid valve ‘A’ circuit poor electrical connection
Tech description
There is a factory service bulletin for the 2004 Toyota Sienna
2004 Toyota Sienna Factory Service Bulletin OBDII Code P0748
2004 Toyota Sienna Factory Service Bulletin OBDII Code P0748
When is the obd code mean?
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
P0748 TOYOTA OBD Code 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).
TOYOTA Related P0748 code
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