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Service bulletin 21-011-16 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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10121646
Published by NHTSA2017-11-03
Manufacturer's number21-011-16 REV. A
Manufacturer's date2016-07-07
NHTSA componentELECTRICAL SYSTEM; POWER TRAIN

NHTSA's summary

Flash: Transmission Diagnostic And Shift Enhancements This bulletin involves reprogramming the Transmission Control Module (TCM) with the latest available software. Some customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation, a technician may find the following Diagnostic Trouble Code (DTC) stored in the TCM memory: · U0404 - Invalid Data Received From Gear Shift Control Module "A". In addition, some customers may experience the following conditions: · **Bumps on 2 -1 down-shift while braking.** · The M on the shifter and Instrument cluster may be blinking. The following improvements are included in this update: · **Improved 1 - 2 light throttle up-shifts.**

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

Electrical system, Transmission and driveline

Trouble codes named

U0404

Vehicles listed
DODGE DURANGO2016
JEEP GRAND CHEROKEE2016

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

Recalls for the same vehicles and component
18V3320002018-05-17. ELECTRICAL SYSTEM:SOFTWARE; VEHICLE SPEED CONTROL:CRUISE CONTROL; ELECTRICAL SYSTEM:WIRING
20161882016-04-27. Electrical
16V2490002016-04-27. EXTERIOR LIGHTING:BRAKE LIGHTS:SWITCH; POWER TRAIN:AUTOMATIC TRANSMISSION:PARK/NEUTRAL START INTERLOCK SWITCH

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

Other bulletins for the same vehicles and component
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S26230000232026-04-15. Service bulletin. Power Liftgate Inoperative.
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1106032026-03-13. Service bulletin. SPEAKER - NONE
1106042026-03-13. Service bulletin. SPEAKER - NONE