# Service bulletin 21\-034\-25

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11019634
- Published by NHTSA: 2025\-06\-18
- Manufacturer's number: 21\-034\-25
- Manufacturer's date: 2025\-06\-13
- NHTSA component: POWER TRAIN
- Manufacturer's system: Transmission Control Module

## NHTSA's summary

"Flash: Transmission Control Module \(TCM\) Updates Customers may comment on one or more of the following: ● Roughness or bumps during gear shifting with heavy load driving on curve maneuvers. ● Secure idle feature does not work when the power panel is on. This bulletin involves reprogramming the TCM with the latest available software."

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11019634-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11019634-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Transmission and driveline

## Vehicles listed

- 2025 RAM 3500

## Recalls for the same vehicles and component

- [25V297000](/recalls/nhtsa/25V297000.md), 2025-05-08: ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; POWER TRAIN:AUTOMATIC TRANSMISSION:GEAR POSITION INDICATION \(PRNDL\)

## Other bulletins for the same vehicles and component

- [114739](/bulletins/11037595.md), 2026-09-30, Service bulletin: POWER TRAIN. TRANSMISSION KIT \- WITH TORQUE CONVERTER
- [08\-301\-26](/bulletins/11035976.md), 2026-08-06, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN. Flash: Electronic Shift Module \(ESM\) Updates Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must SYMPTOM: exhibit/set the following Diagnostic Trouble Code \(DTC\): ● U1057\-00 \- High Speed Fd\-Can3 Communication Bus Performance. Customers may also comment on the following: ● If the vehicle has a low or drained battery and requires a jump start, once jump started, the vehicle will not shift out of Park. This bulletin involves reprogramming the ESM with the latest available software.
- [18\-038\-26 REV. A](/bulletins/11035974.md), 2026-08-06, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN. Flash: Powertrain Control Module \(PCM\) Updates Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle exhibit/set SYMPTOM: one or more of the following Diagnostic Trouble Codes \(DTCs\): ● P219A \- Bank 1 Air\-Fuel Ratio Imbalance. ● P219B \- Bank 2 Air\-fuel Ratio Imbalance. ● P032F \- Combustion Engine Producing Insufficient Torque. NOTE: This revision has an updated and more effective fix for DTC P219B than the prior version. Customers may experience one or more of the following: ● \*\*Power Take Off \(PTO\) may cancel during engagement with high PTO loads.\*\* ● Engine speed surging, unstable, hunting, or oscillating while coasting at low vehicle speeds. ● Stationary Idle PTO feature is not activating when the user configuration is selected to require parking brake be set \(DD/DP Only\). ● PTO not auto\-resuming after hard\-wired remote start \(DD/DP Only\). ● Driveline clunk or bump when coasting to a stop in cruise control mode. ● Engine idle undershoot or delayed response with power steering input. In addition, the following software enhancement\(s\) is available: ● Increase the duration that PTO related messages are displayed on the Instrument Panel Cluster \(IPC\) \(DD/DP Only\). This bulletin involves reprogramming the PCM with the latest available software.
- [S2523000088 REV.B](/bulletins/11035086.md), 2026-07-18, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN. Vehicle Shifter Will Not Shift Out Of Park.
- [18\-066\-26](/bulletins/11035054.md), 2026-07-18, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN. Seed Request Denied During Technicians may experience the following: SYMPTOM: ● The scan tool displays the message "Seed Request denied" when attempting to reprogram the PCM to the latest available software.
- [S2523000055 REV.D](/bulletins/11034387.md), 2026-07-02, Service bulletin: POWER TRAIN; SERVICE BRAKES. Mil\-On/Check Engine Lamp \(CEL\), Antilock Brake System \(ABS\) Lamp, Diagnostic Trouble Code \(DTCs\).
- [9100841 Rev 1](/bulletins/11034380.md), 2026-07-02, Service bulletin: POWER TRAIN. If customer concern diagnosis leads to suspect u\-joint issue with the prop shaft, u\-joint service kit should be utilized to fix concern. Prop shaft replacement would not be required.
- [9100841](/bulletins/11034338.md), 2026-07-02, Service bulletin: POWER TRAIN. HD Front and Rear Prop Shafts Increase U\-Joint Usage If customer concern diagnosis leads to suspect u\-joint issue or failure with the prop shaft, u\-joint service kit should be utilized to fix concern. Prop shaft replacement would not be required.
- [21\-028\-26 REV. A](/bulletins/11032327.md), 2026-05-06, Service bulletin: POWER TRAIN. 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: ● Customer is unable to switch the ignition to OFF when in Park gear. ● After shifting into Park, the Instrument Panel Cluster \(IPC\) will display that the transmission is in Neutral. NOTE: The transmission will actually be in Park and able to hold the vehicle, but the cluster display would indicate Neutral, preventing the engine from shutting off. ● 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 inspecting and if required reprogramming the TCM with the latest available software
- [21\-028\-26](/bulletins/11031329.md), 2026-04-15, Service bulletin: POWER TRAIN. Flash: Transmission Control Module \(TCM\) Updates Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle may SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ? P0826\-00 \- Up/Down Shift Sw

JSON: [/v1/bulletins/11019634](/v1/bulletins/11019634)

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