2022-2024 BMW i4/i7/iX Drivetrain Malfunction TSB

Owners of certain 2022-2024 BMW i4, i7, and iX electric vehicles may encounter a "Drivetrain Malfunction message" displayed in the instrument cluster, accompanied by specific fault codes related to the high-voltage system. This issue, detailed in BMW Technical Service Bulletin SIB 12 05 23, points to insulation faults within the Combined Charging Unit (CCU).

This bulletin applies to vehicles built before February 24, 2023. The root cause is typically traced back to the eDrive motor, where metal chips or manufacturing contamination can lead to insulation problems.

Symptoms

Owners may observe the following symptom:

• A "Drivetrain Malfunction message" displayed in the instrument cluster.

Fault Codes / DTCs

When diagnosing the issue, technicians may find the following fault memory entries saved in the Combined Charging Unit (CCU):

Code	Description	Module
0317F2	High-voltage system, insulation fault detected: when switch contactors are closed.	CCU (Combined Charging Unit)
0317F1	High-voltage system, insulation resistance below warning threshold: when switch contactors are closed.	CCU (Combined Charging Unit)

These isolation faults, 0317F2 and 0317F1, can appear individually or in combination.

Diagnosis

The diagnostic process involves using the ISTA test procedure to trace the fault back to the eDrive motor. If the ISTA procedure identifies "a metal chip is found behind the brush module" (located between the brush module and the end shield of the electrical machine) as the possible cause, then a specific repair is required as outlined in service solution no. 20000794435083 in Aftersales Information Research (AIR).

Cause of the BMW i4 Drivetrain Malfunction

The primary cause for the "Drivetrain Malfunction message" and related insulation faults is the presence of a metal chip behind the brush module. This, or other contamination within the eDrive unit from the manufacturing process, can lead to the detected insulation issues. This metal debris may not always be visible without disassembly.

Important Warnings for Owners and Technicians

This Technical Service Bulletin (SIB 12 05 23) includes critical warnings regarding high-voltage system work and specific repair instructions:

• "ONLY PERFORM THIS PROCEDURE IF TEST PLAN DIAGNOSIS LEADS TO THE CLEANING PROCEDURE."
• "Important Warning for Working on the High-Voltage (HV) systems on BMW Group vehicles: Only properly trained personnel, who passed all applicable HV Technical Training Courses, should perform repairs which require disconnecting, or removal of High Voltage battery components on any Hybrid or Electric Vehicle. Work performed on High Voltage systems by unqualified persons may result in severe injury or damage to the vehicle. Additional safety information is found in Repair Instruction 61 00... 'Observe safety instructions when handling electric vehicles'."
• "Qualification level after completing the Technical Training Course ST1824 (Alternative Drive Part 1). Once the vehicle's HV system is disabled (the 'Blitz' – lightning bolt icon displayed in instrument cluster, see below), a technician without HV Certification can remove a HV component (e.g., EH Heater, EKK Compressor, EME Control Unit, et.), except for the High Voltage Battery."
• "High Voltage Battery removal and rework can be performed ONLY by a HV Specialist Technician (certified by the Technical Training Course ST1825 - Alternative Drive Part 2), AND with a HV Battery Certification level corresponding to a specific Electric or Hybrid vehicle (e.g., to repair GEN4 battery of G05 PHEV, certification from Technical Training Course 'ST2006 – SP44 HV Battery' is required)."
• "Therefore, to perform this SIB 12 05 23, a GEN5 battery Certification is required from Technical Training Course 'ST2205 Generation 5 High-voltage' class)."
• "NOTE: DO NOT DRAIN TRANSMISSION FLUID."
• "NOTE: DO NOT REPLACE BRUSH MODULE."
• "Never use mechanical cleaning tools!"

Repair Procedure Summary

The repair for the BMW i4 Drivetrain Malfunction involves a meticulous cleaning process of the eDrive motor's brush module area:

1. Diagnosis Confirmation: Ensure the ISTA test procedure confirms the presence of a metal chip behind the brush module as the cause for the insulation faults.
2. HV System Safety: Only properly trained and certified personnel should perform this repair, following all high-voltage safety protocols, including disabling and securing the HV system.
3. eDrive Motor Removal: Remove the affected eDrive motor (either front or rear, depending on the specific vehicle model and diagnostic results).
4. Brush Module Removal: Carefully remove the brush module from the eDrive motor.
5. Cleaning: Thoroughly vacuum the area on the eDrive motor behind the brush module and the brush module itself. Then, use a clean, lint-free cloth to wipe the eDrive motor area and the slip rings on the rotor.
6. Reassembly: Reinstall the brush module and reassemble the eDrive unit.
7. Post-Repair Test: Perform an End-of-Series (EoS) test on the drive unit.
8. Final Installation: Reinstall the drive unit in the vehicle after a successful EoS test.

Required Tools or Parts

Specific materials are required for this repair, including:

• HT-12 Antifreeze RTU (Bulk 1/10 Liter) (Part Number: 83 19 5A32851) or BMW Antifreeze/Coolant (1 Gallon Concentrate) - HT-12 (Part Number: 83 19 2468442)
• Lint-free cloth (sourced locally)
• Liquid sealant, Loctite 5970 (50 ML) (Part Number: 83 19 0404517)

Additionally, other small parts such as fluids, lubricants, one-time use screws, nuts, and seals, which are not explicitly listed, must be selected from the Electronic Parts Catalog (ETK) or other approved BMW resources according to the specific vehicle type and ISTA repair instructions.

Warranty Information and Labor Operations

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 issue is 1233001500 for "eDrive motor-permanent malfunction."

Various labor operations are associated with this repair, including vehicle testing (00 00 006, 00 00 556), supporting voltage (61 21 528), diagnosis (61 00 006*, 00 58 500*), eDrive unit removal/installation (12 35 530, 12 35 520), brush module replacement (12 37 902, 12 37 702), and performing an EoS test (12 35 900). Additional labor for wheel alignment (32 00 595, 32 00 601, 32 00 650, 32 00 NNN) may also be necessary. For specific documentation and claiming procedures, technicians should refer to Service Information Bulletins SI B01 01 20 or B01 07 20.

NHTSA ID: 10242885