Mercedes EQA 2021–2025 — technical service bulletin
Bulletin LI20.30-P-078333 · NHTSA communication 11016022 · issued Mar 21, 2025
Technical service bulletin
communication type
Engine
component
2021–2025
model years
12
vehicle entries
Official summary
Complaint A "Coolant level too low" warning message is shown in the instrument cluster. Fault code P25567B ('Coolant level' sensor has detected a fault, fluid level is too low.) is stored in the signal acquisition and actuation module (SAM) control unit N10. Cause The vehicle's electric drive motor transports air into the cooling system. The air transported into the cooling system leads to the formation of an air cushion in the expansion reservoir, which in turn causes the coolant level to drop below the warning threshold of the coolant's fill level sensor when driving. After opening the closi
Vehicles covered
- 2021 Mercedes EQA
- 2023 Mercedes-Benz EQB 250+
- 2024 Mercedes-Benz EQB 250+
- 2025 Mercedes-Benz EQB 250+
- 2022 Mercedes-Benz EQB 300 4MATIC
- 2023 Mercedes-Benz EQB 300 4MATIC
- 2024 Mercedes-Benz EQB 300 4MATIC
- 2025 Mercedes-Benz EQB 300 4MATIC
- 2022 Mercedes-Benz EQB 350 4MATIC
- 2023 Mercedes-Benz EQB 350 4MATIC
- 2024 Mercedes-Benz EQB 350 4MATIC
- 2025 Mercedes-Benz EQB 350 4MATIC
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.