Flash: Transmission Control Module (TCM) Updates Customers must experience a Malfunction Indicator Lamp...
Ram technical service bulletin 21-042-25 for 2025 Ram 3500.
- Bulletin number
- 21-042-25
- Component
- Power train
- Summary
- Flash: Transmission Control Module (TCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle may exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0826-00 - Up/Down Shift Switch. ● P0827-00 - Up/down Shift Switch Circuit Low. ● P085F-00 - Up And Down Shift Switch Circuit Range/performance. Customers may also experience one or more of the following: ● Vehicle stuck in default gear, and possibly stranded for many minutes. ● Rough/bumpy 2-3 power on upshifts and/or 3-2 coast down shifts. ● Vehicle enters into limp home mode. Other software improvements: ● Decreased sensitivity to DTCs P1D8A and P1D8B This bulletin involves reprogramming the TCM with the latest available software.
Owners of these vehicles have filed 8 complaints in the transmission category.
Vehicles covered
VIN decoder
See the problems and recalls for an exact car
Buying a used Ram 3500?
Check the exact car before you pay: accidents, salvage or flood titles, odometer readings and previous owners.
Check its history