2022-2024 BMW i4, i5, i7, iX Drivetrain Malfunction TSB

Symptoms

Owners of certain 2022-2024 BMW i4, i5, i7, and iX vehicles may observe a "Drivetrain Malfunction message displayed in the instrument cluster." This warning is typically accompanied by specific fault memory entries saved in the Combined Charging Unit (CCU).

Fault Codes / DTCs

When diagnosing the "Drivetrain Malfunction message," technicians may find the following fault codes stored in the CCU:

• 0317F2: "High-voltage system, insulation fault detected: when switch contactors are closed."
• 0317F1: "High-voltage system, insulation resistance below warning threshold: when switch contactors are closed."

These are referred to as "isolation faults" and can appear individually or in combination.

Diagnosis / Trigger Conditions

The presence of fault codes 0317F2 and 0317F1 indicates an insulation issue within the high-voltage system. These faults must be traced back to the eDrive motor using the BMW ISTA test procedure. The ISTA diagnosis may identify the root cause as a metal chip located behind the brush module, specifically between the brush module and the end shield of the electrical machine, or general contamination of the eDrive unit. This condition affects vehicles built before November 2023.

Cause

The primary cause for the "BMW i5 Drivetrain Malfunction" and related isolation faults is the presence of a metal chip behind the eDrive motor's brush module. Alternatively, contamination of the eDrive unit during the manufacturing process can also lead to this issue. This metal debris or contamination may not always be visible without disassembly.

Important Warnings

BMW emphasizes strict safety protocols for this repair, especially concerning high-voltage (HV) systems:

• High-Voltage System Safety: Only personnel who have completed all applicable HV Technical Training Courses are authorized to perform repairs involving HV battery components. Performing such work without proper training can result in severe injury or vehicle damage. Additional safety information is detailed in Repair Instruction 61 00... "Observe safety instructions when handling electric vehicles."
• HV System Disabling: Before disconnecting or removing any HV component, the HV system must be disabled and secured by a properly trained technician with a minimum HV Qualification level (e.g., ST1824 Alternative Drive Part 1 training).
• HV Battery Rework: High Voltage Battery removal and rework can only be performed by an HV Specialist Technician certified through specific training courses (e.g., ST1825 Alternative Drive Part 2, ST2205 Generation 5 High-voltage).
• Procedure Specificity: "ONLY PERFORM THIS PROCEDURE IF TEST PLAN DIAGNOSIS LEADS TO THE CLEANING PROCEDURE."
• Transmission Fluid: "DO NOT DRAIN THE TRANSMISSION FLUID."
• Brush Module Replacement: "DO NOT REPLACE BRUSH MODULE." The procedure focuses on cleaning, not replacement.
• Cleaning Tools: "Never use mechanical cleaning tools!" Only a clean lint-free cloth should be used.

Repair Procedure Summary

The repair procedure, detailed in BMW Service Information Bulletin SIB 12 05 23, involves a thorough cleaning of the affected eDrive motor components. Depending on the vehicle model and ISTA test results, either the front or rear eDrive motor will be addressed. The general steps are:

1. Remove the affected eDrive motor as per the ISTA test module instructions.
2. Remove the brush module from the eDrive motor. Specific repair instructions, such as 12 35 530/12 35 531 for the rear and 12 35 520/12 35 521 for the front, should be followed.
3. Thoroughly vacuum the area on the eDrive motor behind the brush module and the brush module itself.
4. Use a clean, lint-free cloth to clean and wipe the area on the eDrive motor behind the brush module.
5. Clean and wipe the slip rings (bronze rings) on the rotor with a clean, lint-free cloth.
6. Important Note: If oil is found leaking from the rotor seal and has contaminated the brush module, a Technical Case (TC) must be submitted to determine the condition of the copper rings before continuing.
7. Reinstall the brush module and reassemble the eDrive unit.
8. Perform an End-of-Service (EoS) test on the drive unit. If the EoS test fails after cleaning, submit a TC case for further steps.
9. Reinstall the drive unit in the vehicle after a successful EoS test.

Required Tools or Parts

Technicians will need the following materials for this repair:

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

Additional parts for eDrive removal and installation may be required depending on the specific vehicle model; refer to the attachment in the original service bulletin for a comprehensive list.

Owner Action

If your 2022-2024 BMW i4, i5, i7, or iX is displaying a "Drivetrain Malfunction message" or exhibiting symptoms related to high-voltage insulation faults, it is crucial to contact an authorized BMW service center. The repair procedure outlined in Service Information Bulletin SIB 12 05 23 is covered under the terms of the BMW New Vehicle Limited Warranty for Passenger Cars and Light Trucks. The repair code for this issue is 1233001500, labeled as "eDrive motor-permanent malfunction."

Source: NHTSA ID 10250361