What are the common DTCs associated with BMW B58D wastegate faults?

The common diagnostic trouble codes (DTCs) are 123432 (Electrical wastegate valve, adaptation: Limit position shut, implausible), 123433 (Electrical wastegate valve, adaptation: adjustment range implausible), and 123511 (Electrical wastegate valve: stiff movement).

What is the primary cause of these wastegate faults in the BMW B58D engine?

According to BMW Service Information Bulletin (SIB) 11 04 24, the primary cause is often corrosion on the wastegate lever and mechanism, leading to binding and improper operation.

Is a special part required during the repair for BMW B58D wastegate faults?

Yes, technicians are instructed to replace the original steering assembly cover with a new part, P/N 51 71 9 642 700, which offers enhanced protection against future wastegate corrosion.

BMW B58D Engine Wastegate Faults TSB SIB 11 04 24

BMW has issued Service Information Bulletin (SIB) 11 04 24 to address specific diagnostic trouble codes (DTCs) related to the electrical wastegate valve in vehicles equipped with the B58D engine. This bulletin outlines a procedure for diagnosing and repairing issues that lead to various wastegate faults stored in the Digital Motor Electronics (DME). Owners experiencing these issues, particularly those with 2024 BMW models like the 3 Series Sedan (G20), 4 Series Coupe (G22), 4 Series Convertible (G23), 4 Series Gran Coupe (G26), and 2 Series Coupe (G42) with xDrive, should be aware of this service action.

The bulletin, SIB 11 04 24, applies to vehicles with the B58D engine and all-wheel drive (xDrive) produced prior to June 1, 2024. It provides a clear path for technicians to resolve the underlying cause of these engine performance warnings, which are often linked to corrosion affecting critical components. Addressing these BMW B58D wastegate faults promptly can prevent further engine complications.

Symptoms and Fault Codes

Owners may notice warning lights or experience drivability concerns related to engine performance. Technicians will find one or more of the following diagnostic trouble codes (DTCs) stored in the DME:

123432 - Electrical wastegate valve, adaptation: Limit position shut, implausible: This code indicates that the wastegate valve's closed limit position is not being correctly adapted or is reporting an implausible value.
123433 - Electrical wastegate valve, adaptation: adjustment range implausible: This suggests an issue with the wastegate valve's ability to adjust within its expected range, leading to an implausible reading.
123511 - Electrical wastegate valve: stiff movement: This DTC points to a physical restriction or stiffness in the movement of the electrical wastegate valve.

These codes collectively indicate a problem with the wastegate's operation, which is crucial for controlling turbocharger boost pressure.

Diagnosis and Repair Procedure Summary

The repair process detailed in SIB 11 04 24 begins with a visual inspection. Technicians are instructed to:

Inspect the wastegate lever and mechanism: The primary focus is to check for any signs of corrosion on these components.
Turbocharger Replacement: If corrosion is identified and is causing the turbocharger wastegate lever to bind, the complete turbocharger unit must be replaced. This step refers to existing BMW repair instruction 11 65 020, titled "Removing and installing/replacing exhaust turbocharger."
Steering Assembly Cover Removal: During the turbocharger replacement, the cover for the steering assembly needs to be removed. This is specifically highlighted as step 23/61 within the broader turbocharger repair instructions.

Important Warnings

A critical step in resolving these BMW B58D wastegate faults involves an update to a protective component. Technicians are explicitly instructed:

Do not reinstall the originally fitted cover for the steering assembly. Instead, it must be replaced with a new part, P/N 51 71 9 642 700. The new cover features an increased protection surface designed to prevent future turbocharger wastegate corrosion.

Required Parts and Materials

To complete the repair, the following parts and bulk materials may be necessary:

51 71 9 642 700: Cover for steering assembly, front right (Quantity 1)
Exhaust turbocharger w. exhaust manifold: Part number to be determined by referring to ETK/AIR based on the specific vehicle's chassis number. (Quantity 1)
Exhaust manifold/turbocharger gasket: Part number to be determined by referring to ETK/AIR. (Quantity 1)

Additionally, various coolants are listed as bulk supply materials:

83 19 5A32851: HT-12 Antifreeze RTU (Pre-mix)
83 19 2468442: BMW Antifreeze/Coolant (1 Gallon Concentrate) - HT-12
82 14 1 467 704: Coolant (1 Gallon Concentrate)

Technicians should obtain and confirm specific part numbers using the chassis number in ETK or AIR to ensure compatibility with vehicle equipment and options.

Warranty and Claim Information

This repair is covered under the terms of the BMW New Vehicle Limited Warranty for Passenger Cars and Light Trucks. The designated Repair Code for this service action is 1165058300 for "Exhaust turbocharger (ATL) incorrect or no switching action."

Applicable labor operations include:

00 00 006 / 00 00 556: Carrying out vehicle test
61 21 528: Supporting voltage of the vehicle electrical system / recharging vehicle battery
61 00 006* / 00 58 500*: Carrying out vehicle diagnosis (Work time / Flat Rate)
11 65 520: Removing and installing/replacing exhaust turbocharger
11 65 509: Additional work, initial filling after replacing turbocharger

For detailed procedures on documenting diagnosis work time, technicians should refer to SI B01 01 20 or B01 07 20. Sublet Code 4 is used for reimbursement of bulk supply materials like antifreeze/coolant.

Source: NHTSA ID 11008988