2023-2024 BMW i7/XM Front Axle Knocking SIB 31 02 24

BMW has released Service Information Bulletin (SIB) 31 02 24 to address a specific concern affecting certain 2023-2024 BMW i7 and XM vehicles. Owners may notice a distinct "knocking, 'thump'-type noise" emanating from the front axle. This bulletin provides diagnostic steps and a software-based repair to resolve the BMW i7 front axle knocking issue.

Symptoms of Front Axle Noise

Owners of affected 2023-2024 BMW i7 (G70) and XM (G09) models may experience a "knocking, 'thump'-type noise" from the front axle. This sound is typically heard during straight-ahead driving on uneven road surfaces, especially at speeds below 40 mph.

Underlying Cause

The root cause of this front axle noise has been identified as components within the Electric Active Roll Stabilization (EARS) system. This system is designed to enhance ride comfort and handling by actively managing body roll.

Diagnosis and Verification

To diagnose the BMW i7 front axle knocking issue, technicians are instructed to first attempt to reproduce the sound. BMW provides an attached video (V31 02 24) that demonstrates the specific noise, with the sound being clearly audible around the 10-second mark. If the sound can be reproduced as heard in the video, the next step involves determining the vehicle's current I-level using BMW's AIR or AWP applications.

Repair Procedure Summary

If the vehicle's current I-level is found to be lower than S18A-23-11-500 for G09 (BMW XM) models or G070-23-11-500 for G70 (BMW 7 Series Sedan & i7 Sedan) models, a software update is required. The vehicle must be programmed using ISTA 4.44.1 or a higher version, which was released in October 2023. The target integration levels after the update are S18A-23-11-525 or higher for G09 models and G070-23-11-520 or higher for G70 models. This programming process automatically reprograms and codes all programmable control modules that do not have the latest software.

If the vehicle's I-level is already above 23-11-52x, further troubleshooting beyond this bulletin is required.

Parts Information

No new parts are required to perform this repair. The solution is entirely software-based.

Important Warnings for Technicians

BMW emphasizes a critical step during the programming process: technicians must always connect a BMW-approved battery charger/power supply (SI B04 23 10) when performing programming. This ensures stable voltage and prevents potential issues during the software update.

Claiming the Repair

For warranty claims related to this issue, the repair code is 3711043900, described as "Active stabilizer bar ARS, front axle Unpleasant noises." Applicable labor operations include 00 00 006 (carrying out vehicle test - main work), 00 00 556 (carrying out vehicle test - plusposition work), 61 21 528 (supporting voltage/recharging battery), and 61 00 730 (program/encode control unit(s)). Additional labor operations for diagnosis, such as 61 00 006* or 00 58 500*, may also apply, with reference to SI B01 01 20 or B01 07 20 for documentation and claiming procedures.

Owner Action

If your 2023-2024 BMW i7 or XM is exhibiting a "knocking, 'thump'-type noise" from the front axle, you should contact your authorized BMW dealer. Inform them about the symptoms you are experiencing and mention BMW Service Information Bulletin (SIB) 31 02 24. The dealer will be able to diagnose the issue and perform the necessary software update.

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Source: NHTSA ID: 10250743