RAM
21-042-25
Manufacturer communications
- Publication date
- 2025-10-11
- Received by NHTSA
- 2025-10-15
- NHTSA record numbers
- 11024306
Manufacturer summary
Original wording in English
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.
• 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.
Reported code forms
Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
Ram
P0826-00Up/Down Shift SwitchRam
P0827-00Up/down Shift Switch Circuit LowRam
P085F-00Up And Down Shift Switch Circuit Range/performanceCheck vehicle applicability
A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Ram | 3500 | 2025 |