2022-2024 BMW i4 Insufficient Cooling Power SIB 64 11 25

BMW has released Service Information Bulletin (SIB) 64 11 25 to address a concern regarding insufficient cooling power in the passenger area of certain 2022-2024 BMW i4 BEV vehicles. This issue is primarily attributed to a hardware malfunction within the Integrated Automatic Heating/Air Conditioning System (IHKA) control unit.

Owners experiencing a lack of effective cooling in their BMW i4 should be aware of this bulletin, as it outlines the diagnostic steps and the necessary repair procedure to restore proper climate control functionality.

Symptoms

Owners may notice that their vehicle's air conditioning system is not providing adequate cooling to the passenger compartment. This symptom, indicating BMW i4 insufficient cooling power, suggests a problem with the vehicle's climate control system.

Fault Codes / DTCs

When diagnosing the BMW i4 insufficient cooling power issue, technicians may find one or more of the following Diagnostic Trouble Codes (DTCs) stored in the vehicle's system:

Code	Description
0380CA	Malfunction or electrical fault of the heat pump circuit expansion valve detected
E70C51	Heat pump circuit changeover valve is not responding
E70C44	Heat pump circuit changeover valve is not responding

These codes specifically point to issues within the heat pump circuit, which is crucial for the i4's climate control system.

Diagnosis / Trigger Conditions

The root cause of the insufficient cooling power is identified as a hardware fault within the Integrated Automatic Heating/Air Conditioning System (IHKA) control unit. The presence of the listed fault codes (0380CA, E70C51, E70C44) confirms that the heat pump circuit's expansion valve or changeover valve is not functioning correctly, leading to the cooling deficiency.

Important Warnings for High-Voltage Systems

This repair involves working with high-voltage components. BMW emphasizes strict safety protocols for technicians performing this service. Owners should be aware of the following critical warnings:

• "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'."
• "High Voltage Battery removal and rework can ONLY be performed by a High-voltage Certified Technician with a HV Battery Certification level corresponding to a specific Electric or Hybrid vehicle."
• "For Generation 5 Vehicles however, the specific vehicle training is required to diagnose, remove and service any HV component and it is NOT allowed for non HV certified technicians to work on the high voltage system."

These warnings highlight that this is not a do-it-yourself repair and must be handled by BMW-certified high-voltage technicians.

Repair Procedure Summary

The correction for the BMW i4 insufficient cooling power involves replacing the IHKA control unit. The general procedure is as follows:

1. Review Repair History: Technicians must first check the VIN-specific Warranty Vehicle Inquiry (WVI) to ensure no prior claims for this repair have been submitted or accepted.
2. Replace IHKA Control Unit: The faulty IHKA control unit is replaced according to repair instructions REP 64 11 692.
3. Vehicle Programming: After installing the new IHKA control unit, the vehicle must be programmed. The ISTA diagnostic system will automatically reprogram and code all programmable control modules that do not have the latest software.
4. Power Supply: Throughout the programming and coding process, a BMW-approved battery charger/power supply (referenced in SI B04 23 10) must be connected to maintain stable voltage.

This repair is categorized as