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Discussion Starter · #1 ·
I have a 2005 Tundra Double Cab Limited with the 4.7 vvti and the 5 speed auto Trans.

The Transmission won't shift into overdrive on its own, so what I have to do is to push the "Overdrive" button to off, and then
push it again to turn it back on and then it will shift into overdrive...

I have to do this every single time, but the Trans will shift into all the other gears just fine.

I Took apart the stearing column and found the wire from the shift lever had been rubbing, I taped it up in hopes that it would cure
this issue but it didn't. I just got a new shift lever today and installed that thinking there could be a possible short in the button itself
and the new lever didn't fix the problem...

Any Help would be greatly appreciated. It is killing my mileage and is more of a pain in the butt to push the button to drop my RPM's

(I have searched for solenoids or wiring into the trans that just for the overdrive and I can't find anything out)

Thank you for the help in advance
 

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Did you do a search of 05 tundra transmission problem? I have an 05 AC which had problems that were major compared to you. I went to a dealer and they said it was a couple of solenoids and they would need to replace the transmission.

This year model has a 15 pin connector where the wire comes from the transmission and connects to the computer. The factory never put dielectric grease in there. My connector had 3 corroded pins that was the problem. I had a transmission shop pick the corroded pins put of the female connector and replace the male connector which came from the transmission. They had to drain the transmission and drop the pan to attach the leads to the solenoids. It cost $400.00

It could be one of those pins in there is corroded which sends the overdrive info. I would bring it to a good transmission shop and explain what was happening. It is easy to pull the connector apart to see if that is the problem. It sounds like a wiring or switch problem somewhere.

Keep us informed on what you find!
 

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Discussion Starter · #3 ·
Thank you for the info..

I have been searching for the info about the Transmission but All I find is that their Trans will just drop from "overdrive" by itself and then re-engage by itself.

I am 95% sure mine is electrical, its just knowing what wires to the transmission do what SO i have a better place to start looking..

I am assuming its a connector or a corroded wire somewhere.

Does anyone have a wiring diagram for a 2005 Tundra 5 speed auto Transmission?
 

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Discussion Starter · #4 ·
JUST AN UPDATE!!!

I got my Tundra Back an hour ago. The Dealership had it for a couple days and were doing tests.

They said that they ECU wasn't communicating with the Trans very well, and they said that the ECU is under warranty still. It has an 8 year 80,000 mile warranty.

I have the truck now, the computer will be in Tuesday or Wednesday.

HOPING FOR THIS TO FIX IT!!! Especially because it is free!
 

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2015 Toyota Tundra DC SR5 5.7L
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JUST AN UPDATE!!!

I got my Tundra Back an hour ago. The Dealership had it for a couple days and were doing tests.

They said that they ECU wasn't communicating with the Trans very well, and they said that the ECU is under warranty still. It has an 8 year 80,000 mile warranty.

I have the truck now, the computer will be in Tuesday or Wednesday.

HOPING FOR THIS TO FIX IT!!! Especially because it is free!
I'd bet money that it isn't the ECU, and the "communication" problem is in the wiring, probably an abraded wire in the column or a connector at the transmission housing.
 

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Discussion Starter · #6 ·
Yeah, I'm hoping its the ECU but i'm not holding my breathe. I know its electrical but nothing in the column that i can see as I have gone through it all searching and whatnot...

A mechanic buddy of mine went through all the connectors on the transmission and all the wires and pins seemed to be just fine.

I hate issues like these, its just time consuming and a pain!
 

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Discussion Starter · #7 ·
I haven't been on here for awhile.
I have an update, the ECU didn't fix anything. But i have noticed that every morning or when the truck is "cold" it shifts flawlessly..
When it is warmed up, it doesn't like to shift from 3rd to 4th very nicely, and won't shift into overdrive unless I "turn off, overdrive" and then "turn it back on" with the shifter.

Is there some type of thermostat that will cause this or some temp sensor?

Thanks for the help
 

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2015 Toyota Tundra DC SR5 5.7L
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Did they closely inspect the condition of the electrical harness at the transmission housing? There are all kinds of connectors down there, and, if they are asserting that the ECU wasn't "communicating with the transmission very well" (something I hugely suspect, btw...), then it has to be at the transmission housing itself.
 

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Discussion Starter · #9 ·
I had them, and also a mechanic buddy and myself went through and checked all the connectors and wires. they weren't corroded at all, and seemed to connect just fine.

I don't know why it will shift perfect when its cold but when it warms up, it has issues.
 

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Discussion Starter · #11 ·
can you tell me where that Temperature switch is located?
I want to see if I can change it to see if that helps with the issue...

Any help would be amazing!!

Thanks so much!

I also had a buddy tell me that a speed sensor could cause issues with the trans shifting?
 
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