2023-2025 BMW i5 Front Axle Knocking Noise TSB

Symptoms

Owners of certain 2023-2025 BMW i5, XM, and 7 Series vehicles may experience a specific issue. While driving at low speeds, typically between 15-40 mph, on flat road surfaces, a "knocking noise from the front axle" may be heard. This noise is particularly noticeable during steering wheel movements. BMW has provided supporting videos, V37 01 24 and V37 02 24, to help technicians identify and reproduce this specific symptom.

Cause

BMW has identified the root cause of this "knocking noise from the front axle" as inadequate preload or gap within the active stabilizer system. This deficiency leads to backlash in the active stabilizer, which then manifests as the audible knocking sound during specific driving conditions.

Repair Procedure Summary

To resolve the knocking noise, BMW Technical Service Bulletin SIB 37 01 24 specifies that the active front stabilizer must be replaced. The detailed replacement procedure is outlined in BMW's internal repair instructions, specifically REP 37 11 511. After the physical replacement, the vehicle may also require programming and encoding updates to ensure all control modules are at the latest software I-level. This programming step is crucial for full functionality and to address any other open technical campaigns.

Required Parts and Tools

The primary component required for this repair is the "Active stabilizer front." Technicians must refer to the Electronic Parts Catalog (ETK) or the Aftersales Information Research (AIR) system to determine the exact part number applicable to the specific vehicle being repaired. This ensures the correct part is ordered based on the vehicle's VIN and fitted options. Additionally, other materials such as fluids, lubricants, one-time use screws, nuts, and seals, as specified in ISTA repair instructions, should be replaced.

Claim Information

For warranty claims related to this issue, BMW has designated Repair Code 3711043900, labeled "Active stabilizer bar ARS, front axle Unpleasant noises." Various labor operations are associated with this repair, including vehicle testing (00 00 006, 00 00 556), battery support (61 21 528), troubleshooting (37 10 002, 37 99 000, 00 58 500), the actual replacement of the active front anti-roll bar (37 11 511), and programming/encoding control units (61 00 730). Dealers should consult SI B01 01 20 or B01 07 20 for specific guidance on documenting and claiming diagnosis work time.

Important Notes for Owners

If your vehicle exhibits a "knocking noise from the front axle," it is important to have it inspected by an authorized BMW service center. The repair involves replacing the active front stabilizer and may include software updates. During the workshop visit, your vehicle might also have other open programming and encoding Technical Campaigns that need to be performed. These procedures are typically covered under warranty for eligible vehicles.

Source: NHTSA ID 11005226