2021-2024 BMW X1 Acceleration Delay from Start-Stop (SIB 12 07 23)

Symptoms

Owners of 2021-2024 BMW X1 (U11) vehicles may notice a "slight acceleration delay when taking off from a MSA (automatic engine start-stop function) stop." This behavior occurs when the vehicle attempts to accelerate after the engine has been temporarily shut off by the start-stop system.

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 when restarting after an automatic stop.

Repair Procedure Summary

BMW Service Information Bulletin SIB 12 07 23 outlines a two-stage software update process designed to improve the vehicle's "driving off characteristics." The first stage involves a DME software update to I-level U006-23-11-500. A second, subsequent update will be released in a future version of the ISTA diagnostic software.

To perform the repair, technicians must first determine the vehicle's current I-level using BMW's AIR or ISPA NEXT/AWP applications. The vehicle then needs to be programmed using ISTA version 4.44.1x or higher, which was released in October 2023. The target integration level for the software update is U006-22-11-520 or higher. This procedure includes programming and encoding the control unit(s) and clearing any stored fault memory.

Required Tools or Parts

To ensure a successful software update, specific equipment is required:

• ISTA Software: Version 4.44.1x or higher.
• Battery Charger/Power Supply: A BMW-approved battery charger/power supply, as detailed in SI B04 23 10, must be connected to maintain stable voltage during the programming process.

Important Warnings

Owners and technicians should be aware of several critical points:

• Battery Connection: It is mandatory to "Always connect a BMW-approved battery charger/power supply (SI B04 23 10) when performing programming" to prevent issues during the software update.
• Module Failure During Reprogramming: If any control modules fail during the reprogramming procedure, technicians should claim the required consequential repair work procedures under the Repair Code 1042033800, using the applicable flat rate labor operation codes.
• Diagnosis Documentation: For documenting diagnosis work time, technicians should refer to SI B01 01 20 or B01 07 20 for the correct procedures.

Warranty Information

Repairs related to this 2024 BMW X1 acceleration delay issue are covered under the terms of the BMW New Vehicle Limited Warranty for Passenger Cars and Light Trucks. Additionally, if applicable, coverage may extend to vehicles under the BMW Certified Pre-Owned Program.

Source: NHTSA ID 10245368