Reference meaning
What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Narrow by vehicle
A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Scan worksheet →Manufacturer communications
3Original wording in English
MERCEDES-BENZ, MERCEDES-MAYBACH
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 R…
MERCEDES-BENZ, MERCEDES-MAYBACH
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 …
MERCEDES-BENZ, MERCEDES-MAYBACH
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 R…
Check vehicle applicability
73A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Mercedes-Benz | AMG EQE ↗ | 2025 |
| Mercedes-Benz | AMG EQE ↗ | 2024 |
| Mercedes-Benz | AMG EQE ↗ | 2023 |
| Mercedes-Benz | AMG EQE 4MATIC+ ↗ | 2025 |
| Mercedes-Benz | AMG EQE 4MATIC+ ↗ | 2024 |
| Mercedes-Benz | AMG EQE 4MATIC+ ↗ | 2023 |
| Mercedes-Benz | AMG EQE 53 4MATIC ↗ | 2024 |
| Mercedes-Benz | AMG EQE 53 4MATIC ↗ | 2023 |
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.