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Service bulletin 21-050-24

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id11008217
Published by NHTSA2024-10-01
Manufacturer's number21-050-24
Manufacturer's date2024-09-26
NHTSA componentPOWER TRAIN
Manufacturer's systemTransmission Control Module

NHTSA's summary

"Flash: Transmission Control Module (TCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set the following Diagnostic Trouble Code (DTC): ● P1DCD-00 - TCM Monitoring Processor Performance Multiple Clutches Locked Up. Customers may also comment on the following: ● Transmission randomly shifts into neutral gear while driving. NOTE: The vehicle can be reset with an ignition/key cycle from Off and then back to Start to allow the vehicle to shift normally. This bulletin involves reprogramming the TCM with the latest available software."

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

Trouble codes named

P1DCD

Vehicles listed
RAM PROMASTER2022

Listing a model year does not mean every vehicle of it is concerned: the document says which.