2022 RAM 3500 Vehicle Speed Control Problems

Every month I am receiving a check engine light for abs / traction control / failure. Dealer states HPU unit is bad, however I noticed all the fuses in the fuse box were loose. I pushed them in to reseat and the error cleared. This happens monthly. This last time happened during a snow storm and disabled abs.

Sudden loss of forward gears. Failure happened on highway at highway speeds. Had to carefully maneuver the truck off the road. Failure in both towing and unloaded operation. Truck will not shift in or out of drive (1-4) but reverse is still functional. Diagnostic trouble code P0731-00 and P0734 "Gear 1 and 4 Shift Incorrect Ratio". Both the dealer and RAM confirm this transmission failure. RAM has realeased a TSB which covers this failure but hasn’t released a recall.

DEF fluid froze leaving crystals that obstructed computer reading of DEF tank. This would have forced vehicle into emergency 5 mile an hour limp mode. Taken to local Dodge/Ram dealer that had nearly THIRTY other diesel trucks with same problem ahead of me. Once repaired to OEM specs, the service manager stated it will happen again. Dodge/Ram acknowledges this has been an issue for years. In Alaska winters this situation could very well be life threatening!!

Without warning the transmission failed. Along with loss of power, when the tranny failed, the ability to use the exhaust brake also fails. The ability to manually downshift fails. I was on steep winding roads in North Idaho (Elk River) when this occurred with three passengers aboard. Once I was able to stop, I was on a steep uphill grade with no forward gears or shoulder to pull over on. I had to coast in neutral back down the mountain to an appropriate site to get off the road. All of this with no forward or reverse gears. The vehicle was towed to a dealership where it was determined to have the K-1 snap ring failure in the Aisin transmission. This problem is common enough that parts to repair the transmission are on back order with no definitive eta available.

2022 RAM 3500 6.7L H/O AISIN transmission failed going down the road. Very bad