Service bulletin 21-007-21
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 | 10188818 |
| Published by NHTSA | 2021-03-15 |
| Manufacturer's number | 21-007-21 |
| Manufacturer's date | 2021-02-16 |
| NHTSA component | POWER TRAIN |
NHTSA's summary
Flash: Transmission Control Module (TCM) Updates This bulletin involves reprogramming the TCM with the latest available software. The customer may experience one or more of the following:Poor shift quality. Shift or gear hunting. The following software enhancement is also available: Stored faults can only be cleared by a diagnostic scan tool, this software will allow the TCM to self clear.
The document
The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.
Components
Transmission and driveline
| RAM 3500 | 2020 |
|---|---|
| RAM 4500 | 2020 |
Listing a model year does not mean every vehicle of it is concerned: the document says which.
| 2022644 | 2022-11-10. Powertrain |
|---|---|
| 22V835000 | 2022-11-10. POWER TRAIN:AUTOMATIC TRANSMISSION |
| 2020025 | 2020-01-24. Powertrain |
| 20V043000 | 2020-01-24. POWER TRAIN:AUTOMATIC TRANSMISSION |
A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.
| 21-039-26 | 2026-05-20. Service bulletin. Replace K1 Clutch / Input Shaft Assembly Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set the following Diagnostic Trouble Code (DTC): ● P0731-00 - Gear 1 Shift Incorrect Ratio (This DTC will set during a key cycle and shifting into Drive). Customers must also comment on the following: ● The transmission will not shift into or out of 1st - 4th gears. 5th and reverse gears are still available This bulletin involves replacing the K1 clutch and possibly the K1 input shaft drum sub-assembly. These repairs are to be performed only if the vehicle is inoperable due to K1 clutch failure |
|---|---|
| 21-039-26 | 2026-05-13. Service bulletin. Replace K1 Clutch / Input Shaft Assembly Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set the following Diagnostic Trouble Code (DTC): ● P0731-00 - Gear 1 Shift Incorrect Ratio (This DTC will set during a key cycle and shifting into Drive). Customers must also comment on the following: ● The transmission will not shift into or out of 1st - 4th gears. 5th and reverse gears are still available This bulletin involves replacing the K1 clutch and possibly the K1 input shaft drum sub-assembly. These repairs are to be performed only if the vehicle is inoperable due to K1 clutch failure |
| S2621000003 REV.A | 2026-03-18. Service bulletin. The vehicle will exhibit a service transmission/check engine warning indicator for the following transmission models: 845RE, 8HP45, 850RE, 8HP50, 8HP70, 8HP75, 8HP75-PHEV, 8HP75-LCV, 8HP90, 8HP95. Transmissions may exhibit the following diagnostic codes: P07E4, P1DB2, P0716, P1B14, P0733, P1D90, P1DB7, P1B13. |
| S2516000001 | 2025-10-29. Service bulletin. Driveline Vibration. Prop Shaft Diagnostic Information. |
| 9100642 | 2025-08-13. Service bulletin. When customer complaint is related to inoperative 4 Wheel Drive shifter, loss of 4WD function and/or 4WD related MIL please reference SOL Case #S2508000062 prior to replacement of Transfer Case shift motor. |
| 03-001-25 REV. A | 2025-02-19. Service bulletin. "Clicking Noise While In 4WD Customers may experience the following: ● Ratcheting, click, or clicking noise in 4WD while turning. This bulletin involves replacing the front driveshaft." |
| 03-001-25 | 2025-02-11. Service bulletin. "Clicking Noise While In 4WD ustomers may experience the following: ● Ratcheting, click, or clicking noise in 4WD while turning. his bulletin involves replacing the front driveshaft" |
| 9100393 Rev 1 | 2025-02-03. Service bulletin. TRANSFER CASE BW 44-46 If fluid leak is present between the transfer case and the rear driveshaft on a 4WD vehicle the Output Shaft Seal should be considered in lieu of entire transfer case or driveshaft replacement. In the case of major damage to components, contact StarCenter and/or proceed with replacements as necessary. |
| 102307 | 2025-01-06. Service bulletin. GEAR - REACTION SUN |
| 102387 | 2025-01-04. Service bulletin. SEAL - OUTPUT SHAFT |