# Service bulletin LI20.10\-P\-078510

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: 11014223
- Published by NHTSA: 2025\-02\-12
- Manufacturer's number: LI20.10\-P\-078510
- Manufacturer's date: 2025\-02\-06
- NHTSA component: ENGINE

## NHTSA's summary

Complaint Red cooling system malfunction warning due to overheat. Low engine performance. Check engine light on. Fault codes may be stored: P21814B The cooling system has a malfunction. There is a fault due to overtemperature. P2B8500 The rpm of the coolant pump is too low. Cause Various Remedy Check for loose plug at electrical connectors of high temp coolant pump \(M43/10 or M75/11\) by gently pulling on connector housings. Create a TIPS case and submit to powertrain team inbox if a loose plug is found at the coolant pump. Include: \-Initial quick test \-Details on any damage found to engine or cooling system. Include photos if applicable. \-Any other relevant details.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11014223-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11014223-9999.pdf)

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

## Components

Engine

## Trouble codes named

P2181, P2B85

## Vehicles listed

- 2022 to 2024 MERCEDES\-BENZ C 300
- 2023 to 2024 MERCEDES\-BENZ GLE 350
- 2025 MERCEDES\-BENZ GLE 350 4MATIC
- 2023 MERCEDES\-BENZ GLE 450
- 2024 to 2025 MERCEDES\-BENZ GLE 450E 4MATIC

JSON: [/v1/bulletins/11014223](/v1/bulletins/11014223)

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