Possible causes
– Low transmission fluid level
– Dirty transmission fluid
– Faulty pressure control solenoid valve ‘C’
– Pressure control solenoid valve ‘C’ harness is open or shorted
– Pressure control solenoid valve ‘C’ circuit poor electrcial connection
– Dirty transmission fluid
– Faulty pressure control solenoid valve ‘C’
– Pressure control solenoid valve ‘C’ harness is open or shorted
– Pressure control solenoid valve ‘C’ circuit poor electrcial connection
Tech description
There is a factory service bulletin for the 2004 Toyota Sienna
2004 Toyota Sienna Factory Service Bulletin OBDII Code P0798
2004 Toyota Sienna Factory Service Bulletin OBDII Code P0798
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)
– Shift shock
– Shift shock
P0798 TOYOTA OBD Code Description
The Engine Control Module (ECM) uses signals from the vehicle speed sensor to detect the actual gear position (1st, 2nd, 3rd, 4th or 5th gear). Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical troubles of the shift solenoid valves and valve body.
TOYOTA Related P0798 code
2004 TOYOTA CAMRY Power Train
2004 TOYOTA CAMRY SOLARA Electrical System
2004 TOYOTA SIENNA Electrical System