# Service bulletin LI20.30\-P\-078333

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11006690
- Published by NHTSA: 2024\-08\-30
- Manufacturer's number: LI20.30\-P\-078333
- Manufacturer's date: 2024\-08\-30
- NHTSA component: ENGINE

## NHTSA's summary

Complaint "Coolant level too low" warning message is shown in the instrument cluster. Fault code P25567B \(The 'Coolant level' sensor has a malfunction. The fluid level is too low\) is stored in the signal acquisition and actuation module \(SAM\) control unit N10. Cause The electric drive motor of the vehicle conveys air into the cooling system. The air conveyed into the cooling system leads to an air cushion forming in the expansion reservoir, which in turn causes the coolant level to fall below the warning threshold of the coolant level sensor during travel. After the cap is opened, the coolant level is once again OK. Remedy Replace the black cap A210 501 06 15 of the large working chamber of the expansion reservoir with a red cap A297 500 51 00 and increase the coolant level by 20 mm over the max. marking. On vehicles where this process does not remedy the issue, the expansion reservoir A 243 500 41 00 is replaced by the modified container A243 500 41 00 28. If the problem is still present, please create a TIPS case.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2024/MC-11006690-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2024/MC-11006690-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine

## Trouble codes named

P2556

## Vehicles listed

- 2023 to 2024 MERCEDES\-BENZ EQB 250\+
- 2022 to 2024 MERCEDES\-BENZ EQB 300 4MATIC
- 2022 to 2024 MERCEDES\-BENZ EQB 350 4MATIC

JSON: [/v1/bulletins/11006690](/v1/bulletins/11006690)

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