Flash: Transmission Control Module (TCM) Updates Customers must experience a Malfunction Indicator Lamp...
Ram technical service bulletin 21-039-25 REV. A for 2025 Ram 5500 and 2025 Ram 4500.
- Bulletin number
- 21-039-25 REV. A
- 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): ● P0827-00 Up and Down Shift Switch Circuit Low. ● P0826-00 Up and Down Shift Switch Circuit. ● 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 faults P1D8A and P1D8B. This bulletin involves reprogramming the TCM with the latest available software.
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