hey guys,
got a 2016 cascadia here with a dd13 and DT12 transmission, truck was towed in since it wouldnt go into gear, the air pressure builds fine, and when put into drive an audible gear drop is heard with the normal air actuation sound and then it will air actuate again and again and again, the display will stay in neutral and pushing the throttle will do nothing, until it beeps and stops trying to go into gear, reverse will not work either. there are no transmission codes, the range splitters pass actuation thru DDL, but when trying to do a gear shift thru DDL, the control unit will give an unexpected error. not sure what it could be, dont have much experience with these transmissions, thanks
DT12 TRANSMISSION ISSUES, STUCK IN NEUTRAL
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by wtokhi, Nov 24, 2021.
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Sticking split pin bushing is a common fault on that model year. You'll have to make and review a log file per the attached file. There's a technical service letter attached that will tell you if this applies to your transmission based on date of manufacture.
Attached Files:
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IMG_3223.MOV
IMG_3222.MOV -
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Dropped it yday, was a pain with the side shifter offsetting the weight, had to remove the air tanks and everything behind it to lift it out with a forklift, is there going to be physical damage I’ll see to the split pin?Attached Files:
Kingeleby Thanks this. -
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Attached Files:
Goodysnap Thanks this. -
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I just did a split pin bushing repair, with transmission in truck. Removed battery power. Now the transmission shifts into neutral sometimes and is searching for a gear you can hear it clicking. Then when the speed lowers it will go back into the gear you were in or skip two gears up. I am wondering if the transmission needs to relearn. If so, can I do that myself or a shop. Also is the relearn clutch and shift pattern? The shift controller came off and I disconnected the tcm. So again after split pin bushing repair is a relearn procedure required?
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