2024 BMW X1 Start-Stop Acceleration Delay TSB

BMW has released Service Information Bulletin (SIB) 12 07 23, Revision 1, to address a slight acceleration delay experienced by owners of the 2024 BMW X1 (U11) model. This bulletin, which supersedes the previous SI B12 07 23 dated November 2023, provides a software-based solution to improve vehicle response.

This SIB specifically targets vehicles that exhibit a "SLIGHT DELAY WHEN TAKING OFF FROM A MSA STOP." The automatic engine start-stop (MSA) function, designed to save fuel, can sometimes lead to a noticeable hesitation when the driver attempts to accelerate after the engine has restarted at a stop.

Symptoms

Owners of affected 2024 BMW X1 vehicles may notice a slight acceleration delay when attempting to drive off after the automatic engine start-stop (MSA) system has engaged and then restarted the engine. This hesitation can impact the driving experience, particularly in stop-and-go traffic.

Cause

The root cause of the 2024 BMW X1 acceleration delay is identified as an issue with the Digital Motor Electronics (DME) software calibration. This calibration affects how the engine responds to throttle input immediately after an MSA stop, leading to the observed delay.

Repair Procedure Summary

To correct the acceleration delay, BMW dealerships will perform a software update on the vehicle's DME. The procedure involves the following steps:

1. Determine Current Software Level: Technicians will first check the vehicle's current I-level using either the AIR or AWP (Aftersales Workplace) applications.
2. Software Programming: The vehicle will be programmed using ISTA 4.48.1x software or a higher version, which was released in July 2024. The target integration level for the U11 (X1 Sports Activity Vehicle) is U006-24-03-5XX or higher.
3. Battery Charger Connection: It is crucial to connect a BMW-approved battery charger/power supply (as per SI B04 23 10) throughout the programming process to ensure stable voltage.
4. Claim Processing: The repair is documented under Repair Code 1042033800, labeled as "Throttle response with hot engine Shaking," which encompasses the software update for improved MSA start-off and throttle application.

Important Warnings

When performing the software programming, technicians are explicitly instructed to always connect a BMW-approved battery charger/power supply (referencing SI B04 23 10). This ensures that the vehicle's electrical system maintains stable voltage, preventing potential issues during the update process.

Warranty Information

This software update, detailed in SIB 12 07 23, is covered under the terms of the BMW New Vehicle Limited Warranty for Passenger Cars and Light Trucks. It may also be covered under the BMW Certified Pre-Owned Program, if applicable.

Claim Information

For warranty claims, the repair code is 1042033800, which is described as addressing "Throttle response with hot engine Shaking." Dealerships will use specific labor operation codes for vehicle testing, supporting voltage, diagnosis, and programming/encoding control units. These include codes like 00 00 006, 00 00 556, 61 21 528, 61 00 006, 00 58 500, and 61 00 730. If multiple technical campaigns are open, only one programming and encoding procedure should be invoiced.

NHTSA ID: 11006720