2021-2024 BMW X5, X6, X7 Engine Malfunction Warning TSB

BMW has released Service Information Bulletin (SIB) 12 06 23, Revision 1, to address an BMW X5 engine malfunction warning and related fault codes in 2021-2024 BMW X5 (G05), X6 (G06), and X7 (G07) models equipped with the B58N engine. This bulletin supersedes the previous SI B12 06 23 dated September 2023, providing updated procedures and additional fault information.

Symptoms

Owners of affected vehicles may notice the engine malfunction warning light illuminated on the dashboard. This warning is typically accompanied by one or more specific fault codes stored in the Digital Motor Electronics (DME) system. These fault codes point to issues with the exhaust switchable cam follower system.

Fault Codes / DTCs

The following fault codes may be stored in the DME:

Code	Description
034D63	Exhaust switchable cam follower, system: continuous deactivation, maximum number of switching errors exceeded
035601	Exhaust switchable cam follower 1, electrical: cable break
035604	Exhaust switchable cam follower 2, electrical: cable break
034BBF	Exhaust switchable cam follower, system: switching errors

Cause

The root cause of these issues, leading to the BMW X5 engine malfunction warning, is identified as an unfavorable calibration within the Digital Motor Electronics (DME) software. This software calibration error affects the proper operation of the exhaust switchable cam follower system.

Important Warnings for Owners and Technicians

BMW has provided several critical advisories related to this service bulletin:

• "If the vehicle is released, then cancel all backorders for any cylinder heads that were already authorized by the TSARA Hotline."
• "If the parts have already been received, then you have the option to return these parts via the IDS System." This involves selecting "Parts Logistics," then "Returns," "Claims," "Quality," and finally "Other" to request the return of items.
• "The parts must be returned within 30 days."
• "Always connect a BMW-approved battery charger/power supply (SI B04 23 10) when performing programming." This ensures stable voltage during the software update process.

Repair Procedure Summary

The correction for the BMW X5 engine malfunction warning involves updating the vehicle's software. The procedure is as follows:

1. If fault code 034D63 ("Exhaust switchable cam follower, system: continuous deactivation, maximum number of switching errors exceeded") is present in the DME, a TSARA Hotline Case must be created, and a response awaited before proceeding with further steps. If this specific fault is not stored, technicians can proceed directly to step 2.
2. Determine the vehicle's current I-level using either AIR or the Key Reader/Aftersales Workplace (AWP) application. The vehicle must then be programmed using ISTA 4.43.2X or higher software to achieve a target integration level of S18A-23-07-545 or higher.
3. After programming, if fault code 034BBF still remains, clear the fault and test drive the vehicle for approximately 5 miles. If no exhaust switchable cam follower faults return, the vehicle can be released. If the faults reappear, another TSARA Hotline Case must be created.

Required Tools or Parts

Technicians will need access to ISTA Next software, specifically version 4.43.2X or higher, to perform the programming. A BMW-approved battery charger/power supply (referenced in SI B04 23 10) is also mandatory to maintain stable voltage during the software update process.

Claim Information

This repair is covered under the terms of the BMW New Vehicle Limited Warranty for Passenger Cars and Light Trucks, including Emissions, or the BMW Certified Pre-Owned Program. The repair code for this issue is 1136100200, described as "eVANOS control unit Software error / internal device fault." Various labor operations are specified, including:

• 00 00 006: Carrying out vehicle test (Main work)
• 00 00 556: Carrying out vehicle test (Plus work)
• 61 21 528: Supporting voltage of the vehicle electrical system / recharging vehicle battery
• 61 00 006: Carrying out vehicle diagnosis, ABL (Work time)
• 00 58 500: Diagnosis Worktime Flat Rate
• 61 00 730: Program/encode control unit(s), includes deleting the fault memory

Technicians are advised to refer to SI B01 01 20 or B01 07 20 for guidance on documenting and claiming diagnosis work time.

Owner Action

If your 2021-2024 BMW X5, X6, or X7 is displaying an engine malfunction warning or you suspect issues related to the exhaust switchable cam follower, it is recommended to contact your authorized BMW dealership. They can diagnose the vehicle, confirm the presence of the relevant fault codes, and perform the necessary software update as outlined in SIB 12 06 23.

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Source: NHTSA ID: 10242884