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Service bulletin S2121000011

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 id10223274
Published by NHTSA2022-10-17
Manufacturer's numberS2121000011
Manufacturer's date2021-05-17
NHTSA componentFORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL:SOFTWARE

NHTSA's summary

Long Crank With Diagnostic Trouble Code (DTC) U0104 ? Lost Communication With Cruise Control Module, Set.

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

Driver assistance, Adaptive cruise control

Trouble codes named

U0104

Vehicles listed
JEEP GRAND CHEROKEE2021

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

Other bulletins for the same vehicles and component
S2108000236 REV.B2025-08-13. Service bulletin. Windshield HUD (Head Up Display) Display Features
08-146-242024-07-02. Service bulletin. "Mid - Range Radar Replacement Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● C00C4-49 Rear Radar Module 'A' - Internal Electronic Failure. Customers may also experience the following: ● Blind Spot Warning Mid Range Radar warning light on in instrument cluster. This bulletin involves replacing the rear Mid - Range Radar Module."