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I got it. I used Alpha obd to change the axle ratio to 3.42. For some reason it had it saved as 3.93.

So today I used Alpha OBD and still get the U1439 code. Is there anything else I can try?

I've ordered everything and I hope I'll get in time to try fixing it this weekend. thanks for the info.

No I don't do that. I'll give that a try.

Does anyone know if Alpha obd will work on a 2018 RAM 3500? I have a U1439 after putting 35" tires on. I took it to the dealer after they told me they can calibrate it for the tire size change. Later said they can do anything!!!!! Thanks

I took it to a dealer to day and they told me that there isn't anything they can do to clear the U1439 code because of the tire size change! Has anyone used Alpha OBD on a 2018 3500 with the aisin transmission? ANY help would be appreciated. Thanks.

The Drive Train Control Modal say the axle ratio is 3.55 and when I looked at the transmission data it say the axle ratio is 3.92.

I bought the truck new and the sales sticker say 3.42's. I dont know if there is something else I need to calibrate after the tire size change like I have to do with the ABS system?

Any chance I don't have 3.42's?

I has able to get rid of U1412 and now I have U1439!!!

Still need help on this. Does anyone have a idea. Also I know my axle ratio is 3.42, but is there any way it could be different?

Thanks

I installed 35" tires and changed the tire size in mm to 2768 with my Solus edge and now have U1412 abs and other codes. When I finished changing the tire size it side to do a ABS Initialization procedure which I can't find. Any ideas?

Mine has done the same in the past. No idea what it is.

bought it with 54k and soon put a Airdog on it. It has 154k now.

What test lead you to injectors? thanks

update.... I contacted Airdog and told what happened and they sent me a new pump. The new on is quieter than the original motor and pump. I am very happy with their customer service.

I had this same problem but happened very randomly. It once went a year without coming on! I eventually bought EFI live and deleted the code.

I saw that the AD2-4G has fixed the problem. They've separated the motor from the pump so if the seal leaks it will leak to the outside. I have found the bearing on Amazon and I'm still trying to find the seal.