Service bulletin 21-024-14

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 Enhancements This bulletin involves selectively erasing and reprogramming the Transmission Control Module (TCM) with new software. The following Transmission Control Module (TCM) calibration improvements are available for vehicles equipped with WA580 Automatic Transmission (Sales Code DGJ).3.6L Engine Poor powertrain response or performance when trying to accelerate from moderate vehicle speed in HOT ambient temperature conditions. Short shifting or surging during near to WOT accelerations with mild ambient temperature conditions . Transmission does not maintain vehicle set speed when cruise control is active and vehicle is traveling down steep grades. Hanging in gear complaints during HOT ambient temperature condition or when aggressively driving and WOT throttle is requested.5.7L Engine Hanging in gear complaints during HOT ambient temperature condition or when aggressively driving and WOT throttle is requested.

The document

• NHTSA's copy of the document (PDF)
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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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