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Re: P0770 diagnostic code
Solenoid E (SL) is the torque converter lock-up solenoid. If the torque converter is a little slow locking up, it will set this code. May only be a one-time thing owing to a small particle of something getting jammed in the solenoid. The code may disappear by itself.
If it doesn't right away, check out the color of your tranny fluid. If it is pretty much red or brown and smells ok, then flush the tranny and see if that gets rid of the code. If not, pull out some fluid and add a bottle of Seafoam Trans Tune and run it for 1 or 2k miles. Then flush the transmission again. Check if the code is gone.
If this problem persists, I've been told you'll have to replace the E-solenoid.
There is a Service Bulleting (EG006-00) issued for '00 Siennas on this problem. They get a new torque converter to fix the problem permanently.
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