Describe your transmission behavior.

[inlandsmog]

There’s something very strange going on if people are having issues outside the tsb. Strange too that some people report zero transmission issues inside the tsb, none of this makes any sense

I'm going to make my own code LOL not going to wait for the transmission to do it.

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[inlandsmog]

will any OBD2 scanner work with the pending codes or do you need something toyota specific?

Any

 

[Vidman]

Well so far my trans is shifting smooth as silk. My vin is not in the TSB and have around 850 miles on it. But now that I mentioned this it will probably start doing strange things..LOL

 

[Compy386]

Anyone notice a lack in RPM increase at 2K RPM in first gear? Seems like when I'm gradually accelerating, my RPM stays at 2K RPM for a few seconds but my speed does increase (almost acts like a CVT transmission where RPM stays the same but speed increases). Is this normal?

I notice this with mine as well at times and have always assumed its torque converter lockup occurring. Shouldn't be an issue if that's the case... it just seems to be more noticeable with the Tacoma than any other automatic vehicle I've owned in the past.

 

[that_frenchman]

Been a while since I've checked in. I now have over 11,000 miles on an OR hybrid built in June 2024 (my VIN falls within the TSB.)

Occasional hard shift leaving home from a cold start, but otherwise smooth and problem-free. Got my first oil change at 10k and no issues there either.

 

[Compy386]

Would you explain what that means in terms for someone who has barely any idea how a modern transmission works ??

(I am by no means an expert, so if anyone wants to add to this or correct me, then please do...)

In a general sense, the torque converter works for an automatic in the same way that a clutch does for a manual - it transmits power from the engine to the transmission.

Best way I've had it described to me is to imagine 2 fans pointed at each other. One of them is powered on (engine) and the other is powered off (transmission.) - The powered-on fan blows air into the powered-off fan and causes it to spin. This is essentially what is happening inside the TC - it's a fluid coupling.

When the TC is "locked up", the engine and transmission are operating at the same speed as if they were directly coupled. When you're noticing the RPM staying put while the truck continues to accelerate, that is the moment that the TC and transmission are syncing speed and become "locked." When the TC is "unlocked", the engine side is spinning faster than the transmission. This is how you're able to sit at a stop with your foot on the brake without the engine stalling.

The TC allows this little bit of slippage to keep low speed acceleration smooth and to allow complete stops like I just mentioned. There are also a ton of other variables at play because some TCs have internal clutches to allow more or less slip in certain situations as well as computer-controlled lockup, so it can lock/unlock as demanded by whatever situation the computer deems necessary.

I *think* the TC in our trucks has both an internal clutch and electronically-controlled lockup. I could be wrong there, however...

 

[Devildog81]

My truck is a late build 24’ and it shifts great on the upshift and most of the downshifts. One thing that drives me crazy with it is a certain spot on the downshift and it’s all the time. Say you are coming into town or start slowing down from going a highway speed and you hit that 30mph mark, the truck will down shift hard in my opinion. I have mentioned this before in another post, but it has not changed even after putting more miles on it.

 

[TacoFreak]

Say you are coming into town or start slowing down from going a highway speed and you hit that 30mph mark, the truck will down shift hard in my opinion. I have mentioned this before in another post, but it has not changed even after putting more miles on it.

My truck did that between about 500 and 1,000 miles, and then it stopped. It also did hard shifts from 1st to 2nd when upshifting, and scary hard shifts into reverse. Since about 1,100 miles everything is perfect again, but I have no idea why, or if it will stay that way.

 

[Devildog81]

My truck did that between about 500 and 1,000 miles, and then it stopped. It also did hard shifts from 1st to 2nd when upshifting, and scary hard shifts into reverse. Since about 1,100 miles everything is perfect again, but I have no idea why, or if it will stay that way.

I have around 1,700 miles on mine now. I was thinking about taking it in to the dealer, but there has been zero check engine lights or other fault lights.

 

[webshot]

With talk of these failed automatic transmissions and much confusion amongst the internet im really curious to hear how everyone’s transmission behaves. Describe your expierence, are your shifts always really smooth, are they always really hard, sometimes hard shifting, do you find the transmission to occasionally be clunky? If you have had your transmission fail please give detailed information on the symptoms leading up to the failure and the failure itself. Mileage and manufacturing date would be helpful as well to gaining a better understanding of what’s going on. I’ll start by saying my truck was built March of 2024, after 650 miles I have most of the time gotten a 1-2 “hard” shift first thing in the morning, and occasionally a rougher shift here and there while driving, most of the time the trans is smooth but in traffic I do find it to be occasionally a little “clunky” . Thanks for those who respond and participate

Shifts a little hard on cold mornings, smooth as butter after that when she warms up. 11000 MI.

 

[TacoFreak]

@Devildog81 Some people get fault lights with codes, but some people get codes without ever seeing a check engine light. My truck had the strange shifts and never set any codes. Some people never have any bad shifts or codes right up until the transmissions fail.

The only way to really know is to read the codes from your OBD2 port, or have your dealer do it. That is one of the odd things about these transmission, because they all seem to work differently.

 

[inlandsmog]

Well, now I am getting a surging after a cold start, 30 mph with a very small load, level road, no acceleration.

 

[tacorancher]

Well, now I am getting a surging after a cold start, 30 mph with a very small load, level road, no acceleration.

Happens to me to sometimes

 

[Burgi]

Well, now I am getting a surging after a cold start, 30 mph with a very small load, level road, no acceleration.

i also get this sometimes around the same speed. It's only happened a couple times and always first thing in the morning on colder days.

 

[TacoFreak]

@Burgi, @tacorancher, @inlandsmog do the engine RPMs stay the same when that happens? I'm wondering if that surge is caused by the ECU or by the transmission. AFAIK my truck has never done that under any circumstances.

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