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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.

By type

By component

By trouble code

Only bulletins with component: Automatic transmission are shown. Show all

Bulletins, newest first
18078232023-08-21. 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.
Y172022-10-17. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE; POWER TRAIN. Customer Satisfaction Notification Y17 Transmission Software Update
S21250000022022-09-26. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). Customer complaint includes a Mil-on condition. Upon further investigation, one or more of the following fault codes may be set in the PCM:
18-072-212022-08-22. Service bulletin. EXTERIOR LIGHTING; FUEL SYSTEM, GASOLINE; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE; FUEL SYSTEM, DIESEL; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); ELECTRICAL SYSTEM; BACK OVER PREVENTION; SERVICE BRAKES, HYDRAULIC. Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the Engine Control Module (ECM) / Powertrain Control Module (PCM) with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that one or more of the following Diagnostic Trouble Codes (DTCs) have been set: P0607-00 - ECU Internal Performance. P0299-00 - Turbocharger Underboost. P1451-00 - Diesel Particulate Filter System Performance. The following improvements are also included in this update: Oil pressure switch modifications. Urea (DEF fliud) level sensor calibration update, to help prevent bumps in DEF level gauge.
S21250000022022-05-31. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). Customer complaint includes a Mil-on condition. Upon further investigation, one or more of the following fault codes may be set in the PCM:

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