2024 BMW G0x G20 Starter Generator Supply Line Service

BMW has released Service Information Bulletin (SIB) 12 05 25 to address a concern with the starter generator voltage supply line in certain 2024 models. This service action aims to prevent potential issues arising from moisture and corrosion within the supply line.

Symptoms

Owners of affected vehicles may experience issues related to the starter generator system. The underlying problem is that moisture can enter the starter generator supply line, leading to corrosion inside the line. While specific dashboard warnings are not detailed in the bulletin, corrosion in this critical electrical component can lead to various electrical system malfunctions.

Cause

The root cause of this issue has been identified as damage to a branch-off point within the wiring harness. This damage is believed to have occurred during the vehicle's initial installation process, allowing moisture ingress over time and compromising the integrity of the BMW starter generator supply line.

Repair Procedure Summary

To resolve the issue, technicians will replace the starter generator supply line. This procedure follows BMW's specific Repair Instruction 12 42 653, titled "Remove and install/replace supply line at crankshaft starter generator." The repair involves carefully removing the existing, potentially corroded supply line and installing a new one according to manufacturer specifications. This ensures a secure and moisture-free connection for the starter generator.

Required Parts

The following parts are required for this repair, with specific part numbers depending on the vehicle model:

For G05 (X5 Sports Activity Vehicle) and G07 (X7 Sports Activity Vehicle) models:

• Crankshaft starter generator supply line: 12 42 9894510 (Quantity: 1)
• Recessed nut repair kit, blue: 33 12 7607158 (Quantity: 1)
• Hexagon bolt: 07 11 9906977 (Quantity: 1)
• Multi-purpose bolt ASA: 07 14 6886617 (Quantity: 10)
• Screw with Loctite: 26 119454792 (Quantity: 4)

For G20 (3 Series Sedan) models:

• Crankshaft starter generator line: 12 42 5A3E802 (Quantity: 1)
• Hexagon bolt: 26 11 7523709 (Quantity: 3)
• Self-locking hexagon nut: 26 12 7536563 (Quantity: 3)
• Hexagon bolt: 07 11 9906977 (Quantity: 1)
• Recessed nut repair kit, blue: 33 12 7607158 (Quantity: 1)
• Hexagon collar nut: 33 32 6760368 (Quantity: 3)
• Outside torx bolt: 26 11 8607971 (Quantity: 3)

Additionally, other small parts like fluids, lubricants, one-time use screws, nuts, and seals, as specified in ISTA repair instructions, will be selected from the Electronic Parts Catalog.

Important Notes for Owners

BMW has indicated that this repair is MOBILE FRIENDLY, meaning it can potentially be performed by a mobile service technician. It is also noted as REMOTE SOFTWARE UPGRADE (RSU) FRIENDLY, though the primary fix involves a physical part replacement. Dealers are instructed to complete this service action before the first vehicle delivery to a customer (for new vehicles) or if the vehicle is already in the workshop for another reason.

If your vehicle requires this service, BMW offers an Alternative Mobility Solution (AMS) for vehicle owners. Reimbursement for AMS expenses can be claimed under Sublet Code 2. For more information regarding AMS, please refer to SI B01 29 16.

Claim Information

Reimbursement for this Service Action will be processed using the normal claim entry procedures. The applicable work package information and part numbers will be used. The specific Repair Code for this action is 0012400600, labeled "G0x G2x Replace starter generator supply line." Dealers will use specific labor operation codes for claim submission, such as 00 78 627 or 00 78 105 for renewing the starter generator supply line.

Source: NHTSA ID 11018723