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October 27, 2025 Service bulletin

Complaint Yellow instrument cluster message: "Cooling system fault, operating energy input reduced,...

Mercedes-Benz technical service bulletin LI83.30-P-079196 for 2022-2024 Mercedes-Benz EQS 450, 2023-2025 Mercedes-Benz EQE 350+ and 2022-2024 Mercedes-Benz EQS 580 and others.

Bulletin number
LI83.30-P-079196
Component
Engine
Summary
Complaint Yellow instrument cluster message: "Cooling system fault, operating energy input reduced, service required". Cause Fault code "B3A0077 - The regulation valve in the refrigerant circuit for the battery cooling gets stuck open. The ordered position cannot be achieved" stored. Faulty expansion valve component part Y140/1 Remedy Check the part number of Y140/1. If the vehicle has A 297 830 79 03 or older, replace Y140/1 with A 297 830 89 03 or newer. Do not replace defective components with part number A 297 830 8903 and an expansion valve production date after February 1, 2025! Please create TIPS case, attach the current quick test and attach picture of the evaporator assembly component part label and a picture of the production date of the EXV Y140/1 (see exampled attached).

Owners of these vehicles have filed 3 complaints in the engine category.

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