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Service bulletins for the 2021 Ram 4500

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.

445 on file from NHTSA, as of 2026-10-19.

About P0731 on the 2021 Ram 4500: what the code means, and the bulletins and recalls about the same components.

By type

By component

By trouble code

Only bulletins with trouble code: P0731 are shown. Show all

Bulletins, newest first
21-039-262026-05-20. Service bulletin. POWER TRAIN. 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
21-039-262026-05-13. Service bulletin. POWER TRAIN. 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
21-051-242024-10-01. Service bulletin. POWER TRAIN. "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 may 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. ** "
21002232023-10-02. Service bulletin. POWER TRAIN. K1 Clutch Snap Ring Repair Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation, a technician may find the following Diagnostic Trouble Code (DTC) has been set: ? P0731-00 - Gear 1 Shift Incorrect Ratio (This DTC will set during a key cycle and shifting into Drive). Customers may 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 drum snap ring and possibly the K1 input shaft drum subassembly.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.