TSB 08-394-25 — Dodge and Jeep Service bulletin
08-394-25 is a service bulletin on file with NHTSA for 3 Dodge and Jeep models, 2019–2023 model years, filed and re-filed as 2 documents. A TSB is factory repair guidance, not a recall — the repair is not automatically free.
What the bulletin says. 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…
NHTSA's own summary of the document, quoted from the public manufacturer-communications file.
Vehicles and model years 08-394-25 names
| Vehicle | Model years |
|---|---|
| Dodge Challenger | 2023 |
| Dodge Charger | 2023 |
| Jeep Renegade | 2019, 2020, 2021, 2022, 2023 |
Every document filed under 08-394-25
Manufacturers re-issue a bulletin as the repair changes, and file separate copies for technicians and for owners. All of them carry the same number.
| Document ID | Filed | Type |
|---|---|---|
| 08-394-25 REV. A | December 12, 2025 | Service bulletin |
| 08-394-25 | December 5, 2025 | Service bulletin |
What 08-394-25 covers
Electrical — the component vocabulary NHTSA files this communication under.
Questions buyers ask
What is TSB 08-394-25?
08-394-25 is a service bulletin filed with NHTSA by Dodge and Jeep, covering 3 Dodge and Jeep models across the 2019–2023 model years. NHTSA's summary reads: 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…
Which vehicles does 08-394-25 cover?
NHTSA's file names Dodge Challenger (2023); Dodge Charger (2023); Jeep Renegade (2019–2023). A bulletin number can be re-issued against more vehicles later, so check the model-year list on this page against your own.
Is TSB 08-394-25 a recall, and is the repair free?
No. 08-394-25 is repair guidance the manufacturer sent its dealers, not a safety defect finding. You pay for the work unless the vehicle is still under warranty. Recall repairs, by contrast, are always free.
How do I get the full text of 08-394-25?
Take the document ID to a dealer's service desk, or search NHTSA's manufacturer-communications records. This page carries every document ID filed under 08-394-25, its date, and NHTSA's own summary from the public file.
Every number on this page is a count of records in the federal complaint, recall, and investigation files published by NHTSA's Office of Defects Investigation. This page lists only what NHTSA's manufacturer-communications file records under 08-394-25. Check any specific vehicle's open recalls by VIN at nhtsa.gov/recalls.