2022 Aisin Failure Tracking Sheet

[Deleted member 47449]

How do these transmissions act when they're cold? Was in the 20s out the other morning when I took mine out. First time I've driven it that "cold" of temps seemed like it wanted to hold the gears longer to 2k and shifted much softer. Cold for SC where I live now, not cold like where I was raised in CT. I never had an auto diesel in CT and wouldn't have one now if they offered a 5g with a G56...

We have a 2024 Ram 3500 4x4 Crew Cab with the Cummins and Aisin. I haven't noticed anything different in the shifting in much colder than 20F temperatures. Certainly can feel the firm shifting on the Aisin of which I really like heading up and down our home's Rocky Mountain steep grade. Also have a 2014 Ram 2500 Crew Cab 4x4 Cummins with the G56 (family) and a 2016 Ram Crew Cab 4x4 6.4L PW with a 66RFE (ours).

 

[downsc123]

How do these transmissions act when they're cold? Was in the 20s out the other morning when I took mine out. First time I've driven it that "cold" of temps seemed like it wanted to hold the gears longer to 2k and shifted much softer. Cold for SC where I live now, not cold like where I was raised in CT. I never had an auto diesel in CT and wouldn't have one now if they offered a 5g with a G56...

The torque converter will not lock until the trans temp gets to 67F (you will see a higher RPM for a given gear you are in). If its really cold, it will lock out 5th and 6th gear for a short time.

 

[mbarber84]

How do these transmissions act when they're cold? Was in the 20s out the other morning when I took mine out. First time I've driven it that "cold" of temps seemed like it wanted to hold the gears longer to 2k and shifted much softer. Cold for SC where I live now, not cold like where I was raised in CT. I never had an auto diesel in CT and wouldn't have one now if they offered a 5g with a G56...

Start watching your transmission temperature reading on the dashboard when it’s really cold outside. If your transmission fluid is colder than 67-68°F, the truck will not lock the converter. Once the temperature exceeds that, the converter will lock. I’d be willing to bet this is what you were experiencing. As mentioned above, if the fluid really cold, it will only permit certain gears and certain engine power until things warm up.

Best thing you can do is plug your block heater in every night, and use remote start (or manually start) the truck and let it go through 5-10 minutes of the cold weather warmup strategy before you drive it.

 

[Deleted member 47449]

On our 2024 Ram 3500 Cummins with the Aisin I use the block heater in cold temperatures, but have started it cold as low as 3F without the engine block heater. I just let it idle to warm up a bit prior to heading down our Rocky Mountain highway grade.

I talked with a local transmission shop after the thermal coolant bypass failed to open on our 2016 Ram 2500 66RFE transmission about installing an aftermarket coolant bypass delete. It's better to have the thermal coolant bypass for our cold winter climate.

 

[AH64ID]

Best thing you can do is plug your block heater in every night, and use remote start (or manually start) the truck and let it go through 5-10 minutes of the cold weather warmup strategy before you drive it.

That much idle time does more harm than good, especially if you’re plugged in.

-35°F last month with the block heater. The engine was plenty warm to drive right away and then rest to the drivetrain won’t get any benefit from the added idle time. The trans was cold and wouldn’t shift to 5th or 6th for a few miles but driving easy warms it up quick and is better on the engine.

Cummins considers anymore than 10 minutes of idle per hour of operation excessive. They recommend 3-5 minutes of idle due in extreme cold when not plugged in.

 

[mbarber84]

That much idle time does more harm than good, especially if you’re plugged in.

-35°F last month with the block heater. The engine was plenty warm to drive right away and then rest to the drivetrain won’t get any benefit from the added idle time. The trans was cold and wouldn’t shift to 5th or 6th for a few miles but driving easy warms it up quick and is better on the engine.

Cummins considers anymore than 10 minutes of idle per hour of operation excessive. They recommend 3-5 minutes of idle due in extreme cold when not plugged in.

I’ve discussed this with two of the guys who are on the R&D engineering team at Cummins, on this specific engine. They’ve had issues with cold oil causing rod / main bearing damage on this series of engines. I guess it has to do with the switch to CGI and the amount of material they removed to lighten up the block. There was actually a software update pushed out very early on in the production years (I think it was 2020 but can’t remember for sure) which changed the cold weather warm up strategy to address this issue. By their own admission, they’re recommending giving the truck a little time to warm up before driving it, and the cold weather warm up strategy does a good job of it. Transmission temp comes up quickly because of the thermal valve block. The Cummins recommendation on idle time is calculated on base idle speed, not on the cold weather warm up strategy. The increase in engine speed and additional load created by the VGT is sufficient to mitigate fuel combustion issues that are common in a cold engine. I agree with you, you don’t want to idle excessively (base idle) but the way Cummins changed the software for cold weather warm up, they’re telling me it rectifies any concerns about the warm up.

 

[AH64ID]

I’ve discussed this with two of the guys who are on the R&D engineering team at Cummins, on this specific engine. They’ve had issues with cold oil causing rod / main bearing damage on this series of engines. I guess it has to do with the switch to CGI and the amount of material they removed to lighten up the block. There was actually a software update pushed out very early on in the production years (I think it was 2020 but can’t remember for sure) which changed the cold weather warm up strategy to address this issue. By their own admission, they’re recommending giving the truck a little time to warm up before driving it, and the cold weather warm up strategy does a good job of it. Transmission temp comes up quickly because of the thermal valve block. The Cummins recommendation on idle time is calculated on base idle speed, not on the cold weather warm up strategy. The increase in engine speed and additional load created by the VGT is sufficient to mitigate fuel combustion issues that are common in a cold engine. I agree with you, you don’t want to idle excessively (base idle) but the way Cummins changed the software for cold weather warm up, they’re telling me it rectifies any concerns about the warm up.

Interesting. I can’t say I’ve noticed anything about the warmup strategy being faster or better on my 22 than my 18. The only thing I’ve really noticed is that the VGT seems to be used less on the 22 for warmup and the EB button does nothing to the VGT position. I suspect that has to do with soot loading the oil with too much exhaust back pressure from the EB on a cold motor. I’d like to hear more about what was changed on the warmup strategy.

The 6.7’s do warm up pretty quick with the EGR.

The transmissions do get the benefit of the thermal bypass, but they are still really slow to warm up. At least the Aisin is with its pretty aggressive TQ converter lockup schedule. I’ll have to pay more attention next time I’m in really cold temps because I don’t recall a TQ converter lockup delay, just an OD delay.

 

[Ostracize]

Start watching your transmission temperature reading on the dashboard when it’s really cold outside. If your transmission fluid is colder than 67-68°F, the truck will not lock the converter. Once the temperature exceeds that, the converter will lock. I’d be willing to bet this is what you were experiencing. As mentioned above, if the fluid really cold, it will only permit certain gears and certain engine power until things warm up.

Best thing you can do is plug your block heater in every night, and use remote start (or manually start) the truck and let it go through 5-10 minutes of the cold weather warmup strategy before you drive it.

It's funny you mention this... My 21 aisin when cold has a 2/3 shift flare but only when it's cold, so only maybe the first 3 or 4 2/3 shifts then it's gone. Once warm(~75on EVIC) it shifts quite smooth (for an aisin atleast)
Not sure if this is "normal" or indicator of some larger issue.

 

[95Ctd]

Start watching your transmission temperature reading on the dashboard when it’s really cold outside. If your transmission fluid is colder than 67-68°F, the truck will not lock the converter. Once the temperature exceeds that, the converter will lock. I’d be willing to bet this is what you were experiencing. As mentioned above, if the fluid really cold, it will only permit certain gears and certain engine power until things warm up.

Best thing you can do is plug your block heater in every night, and use remote start (or manually start) the truck and let it go through 5-10 minutes of the cold weather warmup strategy before you drive it.

Definitely what it felt like. Good to know it prevents lockup under certain temps. Trans was 65* when coolant about 90* when I started rolling.

 

[95Ctd]

Only reason I asked how they act is because mine went through the k1 recall and they had to pull it again because one of the seals didn't seal and didn't want to be paranoid or bring it back in since it's rarely that cold here. Assuming they rolled a seal it or it was out of tolerance.

Don't let one question about how do these act when cold turn into a idle or not to idle debate. I'm sure there is some warm up strategy that closes the throttle and opens the egr to help them warm up faster but introduces more soot etc.

I plugged in one my 12v for a few weeks when I first got it. Never plugged them in again. Always started, gave them 5min to go through the grid heater power cycles while cleaning the snow and ice off the truck and then straight to pushing feet of snow.

 

[KrisMarkham]

We have not been diagnosed yet, the Y-tech program is out nationwide. But, transmission lost everything but reverse and 5th gear. Wouldn’t drive to get straightened out in front of wrecker. We were in the middle of nowhere by big bend NP and had no cell service. Somehow we got it to actually drive in 5th. Wouldn’t shift, downshift, and 4wd didn’t work. Have a $1600 tow bill up to fort Stockton and are awaiting diagnosis now. 22 3500 Laramie dually. I believe November build date. Don’t have tranny info since it all kind of happened so quick. Our purchase dealership said we were not a part of that TSB…Butttttt I’m learning otherwise on here. 48,800 miles on the truck.

 

[BCCA]

We have not been diagnosed yet, the Y-tech program is out nationwide. But, transmission lost everything but reverse and 5th gear. Wouldn’t drive to get straightened out in front of wrecker. We were in the middle of nowhere by big bend NP and had no cell service. Somehow we got it to actually drive in 5th. Wouldn’t shift, downshift, and 4wd didn’t work. Have a $1600 tow bill up to fort Stockton and are awaiting diagnosis now. 22 3500 Laramie dually. I believe November build date. Don’t have tranny info since it all kind of happened so quick. Our purchase dealership said we were not a part of that TSB…Butttttt I’m learning otherwise on here. 48,800 miles on the truck.

M̶y̶ t̶r̶u̶c̶k̶ w̶a̶s̶ a̶l̶s̶o̶ n̶o̶t̶ l̶i̶s̶t̶e̶d̶ i̶n̶ t̶h̶e̶ T̶S̶B̶ w̶i̶t̶h̶ a̶ N̶o̶v̶e̶m̶b̶e̶r̶ b̶u̶i̶l̶d̶ d̶a̶t̶e̶. The transmission serial number said my transmission was from September so my transmission was within the affected date. Just must have been sitting around and put in a truck late November.

Edit to include TSB link.

 

[AH64ID]

We have not been diagnosed yet, the Y-tech program is out nationwide. But, transmission lost everything but reverse and 5th gear. Wouldn’t drive to get straightened out in front of wrecker. We were in the middle of nowhere by big bend NP and had no cell service. Somehow we got it to actually drive in 5th. Wouldn’t shift, downshift, and 4wd didn’t work. Have a $1600 tow bill up to fort Stockton and are awaiting diagnosis now. 22 3500 Laramie dually. I believe November build date. Don’t have tranny info since it all kind of happened so quick. Our purchase dealership said we were not a part of that TSB…Butttttt I’m learning otherwise on here. 48,800 miles on the truck.

November of 21 or 22?

My truck was also not listed in the TSB with a November build date. The transmission serial number said my transmission was from September so my transmission was within the affected date. Just must have been sitting around and put in a truck late November.

Where did you see an affected date range?

 

[BCCA]

Where did you see an affected date range?

Sorry my statement was incorrect. I thought I read somewhere back when I was going though this that the inspection process was changed in October. My truck does fall just inside the official TSB dates. Back when it was getting it's new transmission I asked the dealer and the serial number had no TSB associated with it

https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://static.nhtsa.gov/odi/tsbs/2023/MC-10243266-9999.pdf&ved=2ahUKEwjB3sCs1Y2MAxXEIUQIHecAHbwQgMkKegQIJRAK&usg=AOvVaw0vGd9ElgRO-xoBhahU5Dq-

 

[mbarber84]

We have not been diagnosed yet, the Y-tech program is out nationwide. But, transmission lost everything but reverse and 5th gear. Wouldn’t drive to get straightened out in front of wrecker. We were in the middle of nowhere by big bend NP and had no cell service. Somehow we got it to actually drive in 5th. Wouldn’t shift, downshift, and 4wd didn’t work. Have a $1600 tow bill up to fort Stockton and are awaiting diagnosis now. 22 3500 Laramie dually. I believe November build date. Don’t have tranny info since it all kind of happened so quick. Our purchase dealership said we were not a part of that TSB…Butttttt I’m learning otherwise on here. 48,800 miles on the truck.

Definitely sounds like a snap ring failure.
If you would like me to add you to the spreadsheet I would be happy to. I just need the information for each column. What you don’t have now, we can add later.

 

[scrambler1000]

My transmission was just replaced. I didn't lose my forward gears but it was occasionally making High pitch noise when the tranny down shifted from 2nd to 1st coming to a rolling stop. I made a 300 mile trip home and took it straight to the dealer. I happened to get a good tech who heard the noise and inspected the trans. He found the K1 clutch retainer plate is cracking.He also found the K3 clutch retainer plate cracking as well. He also said there was light scoring on the trans pump. He found clutch disc material and metallic material in the pan. My truck only has 18000 miles on it and occasionally tows a open 20 ft aluminum single car trailer. The truck it definitely overkill for how i use it. If you want to add to list.
truck build date 10/21
took delivery 12/21
original trans # 1I-2444
New trans # 4J-0154 part # 68498560-AB
I was not towing
I did not lose forward gears but it started to make a noise on downshift. Not consistently.

 

[mbarber84]

Just an update on this K1 snap ring failure issue:

The NHTSA is still actively investigating. Make sure if you have / had a failure you have reported it to them via the website or the phone contact.

Ram recently released an extended warranty bulletin and updated TSB for this issue. They’re now granting a 10yr / 150,000 mile extended warranty on the k1 clutch and shaft assembly to trucks potentially impacted by this issue. See warranty bulletin below:


Looks like customer notification letters have been going out in the mail.