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December 1, 2021 Service bulletin

The SIM card installed in the telematics control unit (ATM2) connects to different mobile providers' networks

BMW technical service bulletin B840621 for 2019-2021 BMW X5, 2018-2021 BMW X3 and 2019-2021 BMW Z4 and others.

Bulletin number
B840621
Component
Electrical system
Summary
The SIM card installed in the telematics control unit (ATM2) connects to different mobile providers' networks. However, due to a missing parameter, this does not work and can cause disruption in BMW ConnectedDrive services in areas with insufficient network coverage.

Owners of these vehicles have filed 472 complaints in the electrical category.

Vehicles covered

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