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My wife's Sienna (1998) just threw the same code: P0773 and a P0770. (shift solenoid E).
From what I've read elsewhere, that code indicates that the solenoid is out of spec (open/short).
The ECM will then avoid locking the overdrive. This will certainly hurt your fuel economy, but won't damage the car, as long as you don't drive 90 :-)
I am hoping somebody here can give us specifics on how to troubleshoot this. i.e. Where is the plug for the shift solenoid so I can check to see if it's the solenoid, or something else... (The solenoid indicates failure at 8 ohms or less, and 100K ohms or more... (at least on a Camry).
Any help?!
--John
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