I have a fleet of DD13 engines paired with Allison automatic, only one paired with DT12 and it has the same problem for the past two years. The problem started when the truck had around 500k miles. Basically, when the truck hit any bump or pothole, it would be out of any gear, and into Neutral. Right before it did that, the Hill Descent, both Re-gen, Start Blocked, and ABS lights would come on. I took it to local Freightliner dealer at least five times for the problem, they eventually lowered the trans and replaced PT Can, split-pin bushing, clutch, wiring harness, new filters, trans fluid, and other things. Now, the problem is that with a load and incline, all the dash lights that I mentioned before would came on, the truck would go into Neutral no matter what gear it was in, but if you let go with the accelerator pedal, the truck would go back into gear, but the cycle never stop, until the truck lost enough speed, and had to pull to roadside to re-start.
F$&K Speedco - They wanted $150.00 shop labor and several hours of wait time with only 1 guy working the lube side for changing out the fluid - I skipped it and got it done in about an hour $50.00 shop labor in Wilmington CA - And FYI DD12 fuid ain't cheap ! Paid $93.00 a gallon from Freightliner for 4 gallons
I have a 2017 DT12... When I'm loaded, if I have my foot to the floor, there will be slipping in 10th 11th and 12th.... Usually at the lower RPM range of those gears, it'll slip for a second and then come back and grab and maybe slip some more, maybe not. But if I'm easy on it, it may not slip as much. It's hard to get it to do it bobtail. But it does still do it, if my foot's to the floor in 12th gear...... If I shift manually, and run the gears a little bit tighter, higher RPM, without my foot to the floor, and I shift into the next gear, the RPMs don't drop as low into the next gear, and I can avoid the slippage. Any thoughts?
No throttle,truck shift to drive and neutral however will act as if it wants to move but will not move either direction drive nor reverse. i really don’t know what’s holding the truck to move. No codes only check engine light. Freight liner cascadia DD15 with DT 12 engine. Will appreciate your input. Thanks.
Hey Steve, my ABS light is coming on whenever I push the brake paddle It will be quick for a few seconds and then goes back off. It just happens when I have a trailer any recommendation thank you
I haul chemicals with tank surge. Do you recommend getting a manual over the DT12 Automatics? It's hard finding a 3-4 year old truck that has a manual transmission.
Hi,mine shift to 7 gear ,then when I accelerate it shows me 7 gear but truck not going,just down shift to 6 and it’s all good ,it happened few times what it can be? I got this truck 2 years ago,I have no chance to change fluid maybe I it’s fluid ?thank you
Hey Steve, I have a DT12 on a 2017 cascadia evo I have started having a issue similar to what you are explaining on the video my dt12 recently started going into neutral while up shifting from 11-12 and more often while down shifting on low gears. When I arrive to a stop or red light it tends won’t go into gear just stay on neutral and I’ll have to switch to drive or reverse and neutral on the handle while it’s on neutral and trying to go into gear it’s making shifting hissing noise like it’s trying to enter but won’t enter gear at some point it’ll go into gear and on handle I’ll switch to drive or reverse depending what I’m trying to do at the moment , can that be related to the relearn ? I’ve added over 100k miles and haven’t done a relearn while doing pm service.. any thoughts on what it might be ?
I have a DT12 in a 2016 and it will not pass transmission relearn but will pass clutch learn. It gives me the fault “minimum distance selector”. I just replaced the shift actuator and the split pin and the transmission wont go in neutral. The dash shows two dashes and the truck will start but wont move. Before this happened we had an issue where the transmission would get stuck in gear and keeps trying to pull forward even when you come to a complete stop. You would have to turn off the truck to stop it from moving. I was told it was the actuator or the split pin so I replaced both and reinstalled the software for the TCM. I dont know a whole lot about these transmissions so any help would be appreciated.
DT12 when pulling a loaded trailor 44k. I slow down to a stop light or brief stop (down shift). The truck accelerates from a brief stop. Truck jerks dives, stutters or sometimes stops especially up hill. The code "wont shift into gear" and " shift to neutral starter block", the codes rhen clear. Come to full stop shift into gear and drives fine. Only seems to happen when coming to a stop from a higher speed then accelerating like at a stop sign. The truck shifts fine when not loaded. Seems to happen with a heavy load so far.
I have a fleet of DD13 engines paired with Allison automatic, only one paired with DT12 and it has the same problem for the past two years. The problem started when the truck had around 500k miles. Basically, when the truck hit any bump or pothole, it would be out of any gear, and into Neutral. Right before it did that, the Hill Descent, both Re-gen, Start Blocked, and ABS lights would come on. I took it to local Freightliner dealer at least five times for the problem, they eventually lowered the trans and replaced PT Can, split-pin bushing, clutch, wiring harness, new filters, trans fluid, and other things. Now, the problem is that with a load and incline, all the dash lights that I mentioned before would came on, the truck would go into Neutral no matter what gear it was in, but if you let go with the accelerator pedal, the truck would go back into gear, but the cycle never stop, until the truck lost enough speed, and had to pull to roadside to re-start.
F$&K Speedco - They wanted $150.00 shop labor and several hours of wait time with only 1 guy working the lube side for changing out the fluid - I skipped it and got it done in about an hour $50.00 shop labor in Wilmington CA - And FYI DD12 fuid ain't cheap ! Paid $93.00 a gallon from Freightliner for 4 gallons
Much appreciative of the break down on the dt12 … especially for the people like my self who works on there own truck
Is it safe to change the fluid if it's at 500,000 miles?
I have a 2017 DT12... When I'm loaded, if I have my foot to the floor, there will be slipping in 10th 11th and 12th.... Usually at the lower RPM range of those gears, it'll slip for a second and then come back and grab and maybe slip some more, maybe not. But if I'm easy on it, it may not slip as much. It's hard to get it to do it bobtail. But it does still do it, if my foot's to the floor in 12th gear...... If I shift manually, and run the gears a little bit tighter, higher RPM, without my foot to the floor, and I shift into the next gear, the RPMs don't drop as low into the next gear, and I can avoid the slippage. Any thoughts?
No throttle,truck shift to drive and neutral however will act as if it wants to move but will not move either direction drive nor reverse.
i really don’t know what’s holding the truck to move. No codes only check engine light. Freight liner cascadia DD15 with DT 12 engine.
Will appreciate your input.
Thanks.
Buen video go USA thanks
What the clutch life on dt12
And what the system when it going to bad and there’s any way to check ?
Hey Steve, my ABS light is coming on whenever I push the brake paddle It will be quick for a few seconds and then goes back off. It just happens when I have a trailer any recommendation thank you
My DT 12 revs up on up shift what would cause this just repleced clutch flywheel and actuator about a year doing something again
l am viet nam love semi trucks united startes.
I haul chemicals with tank surge. Do you recommend getting a manual over the DT12 Automatics? It's hard finding a 3-4 year old truck that has a manual transmission.
Hi,mine shift to 7 gear ,then when I accelerate it shows me 7 gear but truck not going,just down shift to 6 and it’s all good ,it happened few times what it can be?
I got this truck 2 years ago,I have no chance to change fluid maybe I it’s fluid ?thank you
Is there a possibility of an internal air leak in DT 12 looks like I have this problem.?
I want to repair my truck's automatic transmission. My truck is in Richmond CA area. Do yoy have any branch in this area?
Hey Steve, I have a DT12 on a 2017 cascadia evo I have started having a issue similar to what you are explaining on the video my dt12 recently started going into neutral while up shifting from 11-12 and more often while down shifting on low gears. When I arrive to a stop or red light it tends won’t go into gear just stay on neutral and I’ll have to switch to drive or reverse and neutral on the handle while it’s on neutral and trying to go into gear it’s making shifting hissing noise like it’s trying to enter but won’t enter gear at some point it’ll go into gear and on handle I’ll switch to drive or reverse depending what I’m trying to do at the moment , can that be related to the relearn ? I’ve added over 100k miles and haven’t done a relearn while doing pm service.. any thoughts on what it might be ?
I'm keeping my 10 manual Eaton
Are there any grease fittings on this transmission?
I have a DT12 in a 2016 and it will not pass transmission relearn but will pass clutch learn. It gives me the fault “minimum distance selector”. I just replaced the shift actuator and the split pin and the transmission wont go in neutral. The dash shows two dashes and the truck will start but wont move. Before this happened we had an issue where the transmission would get stuck in gear and keeps trying to pull forward even when you come to a complete stop. You would have to turn off the truck to stop it from moving. I was told it was the actuator or the split pin so I replaced both and reinstalled the software for the TCM. I dont know a whole lot about these transmissions so any help would be appreciated.
Did you figure out what the issue was im having a similar issue
Did you figure out what the issue was ?
DT12 when pulling a loaded trailor 44k. I slow down to a stop light or brief stop (down shift). The truck accelerates from a brief stop. Truck jerks dives, stutters or sometimes stops especially up hill. The code "wont shift into gear" and " shift to neutral starter block", the codes rhen clear. Come to full stop shift into gear and drives fine. Only seems to happen when coming to a stop from a higher speed then accelerating like at a stop sign. The truck shifts fine when not loaded. Seems to happen with a heavy load so far.
Sir, did ever find out what was the cause , I’m dealing with that exact problem? Thanks!
Hi I have same problem with my 2019 Freightliner’s Cascadia, specially when it’s cold weather, what would be the problem thanks
Can you install a PTO on this dt12
Where do you find a pot for it
Any luck??? On PTO DT12