Service bulletin 21-017-14

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 Shift And Driveability Enhancements This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) and Transmission Control Module (TCM) with new software.Both the PCM and TCM must be up to date for these changes to be effective. The customer may indicate that they are not satisfied with the shift quality of the transmission. Improvements to the transmission calibration have been made to the following:Upshift Improvements Shift quality in Normal Mode Shift quality in Sport Mode Shift inhibit while transitioning in/out of MDSDownshift Improvements Downshift quality while accelerating Downshift quality while coastingGeneral Improvements Torque converter clutch control during interlocked downshifts Torque converter clutch control during accelerator pedal tip in/out High speed gear hunting (shifting back/forth repeatedly between two gears) Allow 3rd gear launch at high altitude while in Snow Mode 2nd gear launch quality in ECO mode Improved reverse speed Display 2nd gear when entering Manual Mode from Snow or ECO Mode

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, Equipment and accessories, 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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