Service bulletins for the 2020 Ram 3500
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.
762 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
By topic
Only bulletins with component: Transfer case are shown. Show all
| 08-094-20 | 2020-11-30. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE); EQUIPMENT. Flash: Drivetrain Control Module (DTCM) Update This bulletin involves reprogramming the DTCM with the latest available software. The customer may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find the following Diagnostic Trouble Code (DTC) has been set::If the customer has any concerns with the transfer case or if the tech performs any repairs on the transfer case, the software must be updated.C140E - Transfer Case Motor Blocked. If DTC C140E is present, follow normal diagnostic procedures before updating the DTCM.In addition the customer may describe the following:The ?Service 4WD? message/fault is displayed in the Instrument Panel Cluster (IPC). Transfer case shift fork tabs broken during range shift. Noisy (clunking/ratcheting) transfer case range shifts. Failure to complete transfer case range shifts. The following software enhancement is available:This update will help reduce premature transfer case failure. |
|---|
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.