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.
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Only bulletins with component: Manual transmission are shown. Show all
| 1807823 | 2023-08-21. Service bulletin. POWER TRAIN:MANUAL TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); POWER TRAIN. Flash: Powertrain Control Module (PCM) Updates Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation, a technician may find one or more of the following DTCs have been set: ? U0418-00 - Implausible Data Received From Brake System Control Module 1. ? P061A - Level 2 Torque Performance. Customers may also experience the following: ? **Driveline bumps and rumbles when lightly applying the accelerator pedal in traffic or at other low vehicle speeds such as parking lot maneuvers.** ? Transmission hard upshifts, rough/bump during low gear 1-2 and 2-3 at 40-64 kph (25-40 mph). This bulletin involves reprogramming the PCM with the latest available software. |
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The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.