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Old 12-22-2021, 11:58 AM #1
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2004 4.7 throwing P0778...help
2004 with 4.7 throwing rarely seen (apparently) P0778. I did knowingly buy it like this. Only has 200K on it and is in great shape other than this. So I rolled the dice based on as much research as I could find. I'm scheduled to have my Master Certified Toyota mechanic dig into it on Jan 18th. Hoping the tranny doesn't fall out before then of course

It drives perfectly fine until you hit 10mph speeding up or slowing down. Then you get a hard hiccup. Only does it around 10mph. No grinding or weird noises. Just a hiccup.

Does anyone have any experience with this at all? Was told it could be a solenoid.

Thanks
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Old 12-22-2021, 08:09 PM #2
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Originally Posted by Panda96 View Post
2004 with 4.7 throwing rarely seen (apparently) P0778. I did knowingly buy it like this. Only has 200K on it and is in great shape other than this. So I rolled the dice based on as much research as I could find. I'm scheduled to have my Master Certified Toyota mechanic dig into it on Jan 18th. Hoping the tranny doesn't fall out before then of course

It drives perfectly fine until you hit 10mph speeding up or slowing down. Then you get a hard hiccup. Only does it around 10mph. No grinding or weird noises. Just a hiccup.

Does anyone have any experience with this at all? Was told it could be a solenoid.

Thanks
If I'm not mistaken that code relates to the B solenoid.

One thing that I would suggest you get your mechanic to check is the wiring connector where it plugs into the side of the transmission, the connector/terminals have been known on a few 4Runners especially on some from the rust belt/snow belt to corrode and causing a bad connection which can cause shifting issues.
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Old 12-23-2021, 12:34 PM #3
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