2025 BMW 5/7 Series 48V Battery Failure TSB

Symptoms

Owners of affected 2025 BMW 5 Series (G60) and 7 Series (G70) vehicles may experience premature 48V battery failure. This issue can trigger a corresponding "Check Control message" on the vehicle's dashboard, indicating a problem with the 48V electrical system.

Diagnosis / Trigger Conditions

BMW Service Information Bulletin SIB 61 24 25 indicates that a limited number of 48V vehicle batteries may have been damaged during the manufacturing process. This damage can lead to the premature battery failure and the illumination of the "Check Control message."

Additionally, the bulletin notes that loose, corroded, or improperly torqued threaded connections can contribute to component damage and trigger the need for this service action.

Repair Procedure Summary

To address the 48V battery failure, BMW has issued Service Information Bulletin SIB 61 24 25, which outlines a specific repair procedure. This involves replacing the 48V battery according to detailed repair instructions, specifically document 61 21 007 | REP-REP-P-6121007-G60 - V.3.

The procedure emphasizes careful handling during battery replacement. Technicians must avoid using force when disconnecting terminal covers, pulling on ground cables, or prying off terminal clips. All threaded connections must be tightened to the specified torque using a torque wrench. After replacement, any associated fault code entries must be deleted, contact surfaces cleaned, and the new 48V battery's software updated. Finally, battery registrations must be performed after diagnosis and after the new battery is installed.

Required Tools or Parts

To perform the repair described in SIB 61 24 25, specific parts and equipment are required:

• 48 V battery: Part Number 61 21 5 B67 379
• 48 V battery vent hose: Part Number 61 21 5 A30 BD9
• BMW-approved battery charger/power supply: As referenced in SI B04 23 10, this is essential for maintaining voltage during programming and coding.

Important Warnings

BMW has issued several critical warnings to ensure the repair is performed correctly and to prevent further damage:

• "Damage to the 48 V battery electronics can occur if it is disconnected from the on-board electrical system while active! Only activate the 48 V electrical system when the 48 V battery is fully installed (connected)."
• "Always connect a BMW-approved battery charger/power supply (SI B04 23 10) when performing programming."
• "Follow repair instructions and ensure all battery cables are fastened with the correct nut at the specified torque."
• "Do not use force when disconnecting terminal covers from the battery."
• "Do not pull on the ground cables."
• "Do not place any tools under the terminal clip to lever (pry) off the terminal cover."

Owner Action

If you own a 2025 BMW 5 Series (G60) or 7 Series (G70) and experience a "Check Control message" or suspect a problem with your 48V battery, you should contact an authorized BMW dealer. This is a manufacturer Service Action, SIB 61 24 25, meaning it addresses a known issue and will typically be performed at no cost to the owner. Dealers can check their systems to confirm if your vehicle is part of this campaign.

NHTSA ID: 11027774