October 29, 2025 Service bulletin

DTC B1E21 is triggered when the TBM Backup Battery is discharged, inactive, or drained

Jeep technical service bulletin 9100708 for 2026 Jeep Grand Cherokee, 2024-2026 Jeep Wagoneer and 2026 Jeep Grand Cherokee L and others.

Bulletin number: 9100708
Component: Electrical system
Summary: DTC B1E21 is triggered when the TBM Backup Battery is discharged, inactive, or drained. This can happen during the lifetime of the vehicle. TBM should not be replace for B1E21, since there is no fault on TBM. TBM battery is replaceable. Part number of the back-up battery inside TBM is 68597650AA.

Owners of these vehicles have filed 65 complaints in the electrical category.

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