Freightliner Cascadia DT12 automatic transmission issues clutch not working truck does not move

WARNING!!: ⚠️⚠️⚠️
Always use the proper tools and safety equipment to perform this job.
Failure to perform the job correctly can result in personal injury or vehicle damage.
Don't do this job if you think you don't have the experience or the equipment to do this job correctly. REMEMBER SAFETY FIRST!

Warning!!! ⚠️⚠️⚠️
This video is just a demonstration of the labor to do to perform this job, the results may vary.
Also, the damage found can be greater that expected and it can result in a massive engine failure.

This video contains advance technician information.

keyworks
freightliner kenworth peterbilt international volvo mack western star cascadia coronado t660 t680 t700 579 389 379 589 vnl vn
cummins isx cummins isx15 cummins n14 cummins m11 cummins isb cummins isb DD15 DD13 DD16 Series 60 caterpillar C15 3406 C13 OM 460 OM471 OM472 OM473 mercedes benz atros DD13 DD15 DD16 60 series class 8 truck tractor

Topics discussed :
what types of problems dt12 transmission have
why is hard to work on automatic transmissions
how a dt12 transmission looks
how to repair a dt12 transmission

symptoms of the fault are:
transmission not going in gear
truck does move
transmission warning on
check engine light on

Tools need:
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Parts needed
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[superpowercars]

Yo tuve unos problemas con mi transmisión DT12 de clutch y aparte de eso se salía de ciertos cambios porque no entraban bien en el engrane. Yo solo figuré todos esos problemas todo por el resultado de una sola cosa que perjudicaba con el agarre del clutch cuando solamente seleccionaba de D (drive) a R (reversa). El clutch está nuevo y aún así algunos mecánicos me decía que era el clutch pero no fue así. Aquí explico lo siguiente de lo que pasó de un trabajo anterior que le hicieron a mi camión con el dueño anterior que nunca me mencionó. La causa de todos mis problemas de transmisión fue por el sensor de presión de aceite del motor que fue “aftermarket”. Debido a ese sensor, la presión leía menos libras de presión de lo que debería de un sensor OEM (original) y en vez de solucionar el problema con remplazar el sensor con uno original, le aumentaron el Idle RPM de 600 a como 720 así para crear más presión de aceite y así para que el camión no joda con que tiene baja presión de aceite. Ese incremento de RPM’s perjudicó con el calibre de la computadora del DT12 y por esa razón mi clutch no agarraba bien cuando selecciono D o R. Compré yo mismo el sensor original y se lo remplacé y ahora me lee más libras de presión con el original y luego fui a que me le redujeran los RPM’s de regreso a 600 como debe ser. Mi punto es que si el motor tiene un idle más arriba de 600 RPM’s por cualquier razón con transmisión DT12, eso te va dar muchos problemas con el agarre de clutch y también para que entren bien los cambios.

[gearg]

Take actuator out, press on it and put finger where the air travels, if it expands, the change it. Also change the split pin bushing

[phxbro]

You are a good mechanic, I salute you

[Hellokinni]

THANK YOU Francisco. The way you held the sensor and rotated the screw In mechanism gave me the idea how to remove it.

[Hellokinni]

What are those two round plastic cups at the bottom @3:07

[malekmohammad]

My transmission shifts higher gear than what it supposed to be for the truck speed! For example it shifts from 6th gear to 9th gear on 15mph or from 8th to 11th gear on 30 mph. It makes the engine die and rpm very low that i have to down shift it manually! Do you what is wrong with it?

[lockporttransport]

Francisco, what's the life expectancy of an AT12? I had my clutch, actuator and clutch brake replaced January 2023. Around May or June it started displaying characteristics of the Split Shift Rod issue, dropping to Neutral and hesitating when upshifting from 9 and would typically drop into 11 at around 1100RPM when clearly it should be in 10th. Then around September it started also exhibiting the DDC-SVC-MAN-0140-15.1 Engine RPM Flare during upshifts. I contacted the dealer inquiring as to why they didn't check the Split Shift Rod when they had it in January, convinced they'd overlooked it. But they showed me a Daimler record of my truck receiving the titanium collar in 2017. They added that they'd never seen one fail. I took it in to have a road test and computer disgnosis and they said they took the screen out and they found metal filings. At 879, 000 miles, they're advising that the transmission needs replacing. Although I'm suspicious of the metal filings being the clutch brake or the split shift rod, I'm more inclined to just replace it than throw good money after bad. Any thoughts?

[depo]

Most of this transmission problem with small air breather ;; or you need to drill the down opining with 2 screws so you relieve the vacum from the clutch room

[davidtchanturia]

Where can I come over to have you test and possibly repair my dt12?

[fradactransport]

Saludos Francisco tu eres hispano porque no haces los videos en español necesitamos videos en español te lo vamos agradecer

[artme-vb]

so my question is on the automatic how long do they last how long will the clutch go out in it

[juanclavijo]

My truck skep gears 6-7 when is cold this is a dd12 transmission.
i saw a video before that people had the same issue and they mention in the comments that it was something easy to fix without putting transmission down, i think it was a gasket, but now i cant find that video, i think it was one of your videos Francisco

[trucker_juice]

Great video! Definitely informative. I did have question in regards to the dt12 not sending any active codes. But instead just setting off both abs and hsa lights. Also showing - - in the gear selection screen. Any input would be greatly appreciated

[ClutchDustKid]

I just got done replacing the clutch in one of these at my shop and per instructions am replacing the actuator on the transmission as well. But when I compress thee actuator and bolt it up in the compressed position it keeps slowly creeping outward until fully uncompressed. I got a brand new o ring on it so it's not that. And if I compress the actuator and hold my finger over the hole it will stay compressed all day long. My question is what inside the transmission could be causing it to lose vaccum? Any help would be awesome thanks. Love the video.

[RanjitSingh-vdos]

Can you please teach us how to bye pass volvo and dd15 trucks transmission neutral switch .in the event of emergency when truck not start due to neutral not detected ? Please help us bro if you can

[ahmedamin]

I have DT12 when ever I come to stop the truck goes into N I was looking for a machanic where can I gett this man’s information please!

[Matthews-]

I have a problem cascadia DD15 no shifting transmission, it looks like the same problem as you showed on the video, I wondered if you solved the issue and shared it if possible please. Thanks

[NorbertoAramburobojorquez]

buenas tardes francisco sabes cual toma de fuerza le queda a este tipo de transmicion?

[JoseMartinez-jlmk]

The transmission control module, Some guy called it T Bar. Base it’s shape.

[louiesaenz]

How do you remove the pressure sensor?