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December 12, 2025 Service bulletin

Telematics Box Module (TBM) Backup Battery Replacement When DTC B1E21 Is Present Technicians may...

Jeep technical service bulletin 08-394-25 REV. A for 2022-2026 Jeep Grand Cherokee, 2022-2026 Jeep Wrangler and 2022-2026 Dodge Durango and others.

Bulletin number
08-394-25 REV. A
Component
Electrical system
Summary
Telematics Box Module (TBM) Backup Battery Replacement When DTC B1E21 Is Present Technicians may experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle may exhibit/set the following Diagnostic Trouble Code (DTC): ● B1E21-96 - Backup Battery Component Internal Failure.

Owners of these vehicles have filed 3,430 complaints in the electrical category.

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