Service bulletin 21-034-19 REV. A

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.

NHTSA's summary

Flash: Transmission Control Module (TCM) Updates This bulletin involves reprogramming the TCM with the latest available software. The following software enhancements are available:Harsh garage shift engagements in to either reverse or drive resulting in excessive shift bump. While in hill descent control, utilizing Electronic Range Select (ERS) buttons to modulate speed, the ERS buttons give a lower or higher gear than required/desired. Under light to medium brake maneuvers on flat ground, customer complains of harsh 4-3 (lines up to with ECO mode transition).

The document

• NHTSA's copy of the document (PDF)
• If that address does not open, try this one

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

Electrical system, Transmission and driveline

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

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

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