My car went into shop for brake sensors that were "fixed". Now after having it in shop, car is not down shifting when slowing down and the PO756 diag is coming up.

Dealer says new transmission....over $4200!

 

P0756

• Shift solenoid valve S2 remains open
• Valve body is blocked
• Automatic transmission (clutch, brake or gear, etc.)

Replacing the transmission is the "blanket repair". That would fix any issue inside the trans. Sounds like they performed no diagnostic at all. Did you pay for diagnostic time? If you did, ask if they performed an active test on the solenoid and if they checked the resistance of the solenoid. It should be 11 to 15 Ω at 20°C (68°F)

 

The solenoid maybe failed. This happened to me on one of my is350s that I had. I bought a new solenoid, fixed the issue, easy to get too when pan is removed by the way.

 

How much did it cost you to replace? My tranny downshifts slow under hard braking so maybe this is also applicable to me....BTW does this throw a MIL?

 

Slow shifting can be one of two things electronics wearing out or fluid is worn and filter is getting clogged. I would first drop the transmission pan replaced the filter and use Toyota transmission fluid
And see if the problem is the same.

 

I had the car take to the dealer and they flushed the tranny. But that doesn't change the filter and the service tech says the issue is still there.

 

Why wouldn't they replace the filter after changing the fluid? That makes no sense (on the dealer's part)..

 

 

bro just buy any even used solenoid and pop it in on ur lunch break if it doesnt work look further

 

Check out your Main ECU first, I had the exact same issue. Fortunately for me it was ECU not transmission.

 

 

did changing the ecu fix your problem? I did the same thing changed my solenoid with a oem solenoid and filter and oil for tranny and still same thing still jerks