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Service bulletin LI27.19-P-080155

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id11026832
Published by NHTSA2025-12-24
Manufacturer's numberLI27.19-P-080155
Manufacturer's date2025-12-19
NHTSA componentPOWER TRAIN

NHTSA's summary

Complaint Oil residue in connector of transmission control unit in dual-clutch transmission models 724.0 and 724.1. Cause As part of the production process, the electrohydraulic controller units are subjected to a function test in an oil bath. Any oil residue remaining in the connector area can be regarded as production process-related. Since the oil used is a non-conducting, non-corrosive medium, the oil residue does not cause any technical impairment and does not result in any consequential damage. Remedy No action or replacement of parts is required! If necessary, clean the connector using compressed air only. Do not use any cleaning agents such as brake cleaner, as this could potentially cause consequential damage!

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Transmission and driveline

Vehicles listed
MERCEDES-BENZ A 2202019 to 2022
MERCEDES-BENZ A 220 4MATIC2020 to 2021
MERCEDES-BENZ AMG A352020 to 2021
MERCEDES-BENZ AMG A35 4MATIC2020
MERCEDES-BENZ AMG CLA352020 to 2024
MERCEDES-BENZ AMG CLA35 4MATIC2020
MERCEDES-BENZ AMG CLA35 4MATIC2026
MERCEDES-BENZ AMG CLA452014 to 2024
MERCEDES-BENZ AMG CLA45 4MATIC2020
MERCEDES-BENZ AMG CLA45S 4MATIC+2026
MERCEDES-BENZ AMG GLA 352024 to 2025
MERCEDES-BENZ AMG GLA 35 4MATIC2024
MERCEDES-BENZ AMG GLA 35 4MATIC2026
MERCEDES-BENZ AMG GLA352021 to 2023
MERCEDES-BENZ AMG GLA452015 to 2019
MERCEDES-BENZ AMG GLA452021 to 2023
MERCEDES-BENZ AMG GLB352020 to 2025
MERCEDES-BENZ AMG GLB35 4MATIC2026
MERCEDES-BENZ CLA 2502018 to 2026
MERCEDES-BENZ CLA 250 4MATIC2020 to 2021
MERCEDES-BENZ CLA 250 4MATIC2026
MERCEDES-BENZ CLA2502013 to 2017
MERCEDES-BENZ GLA 2502015 to 2026
MERCEDES-BENZ GLA 250 4MATIC2021
MERCEDES-BENZ GLA 250 4MATIC2024
MERCEDES-BENZ GLA 250 4MATIC2026
MERCEDES-BENZ GLB 2502020 to 2026
MERCEDES-BENZ GLB 250 4MATIC2020 to 2021
MERCEDES-BENZ GLB 250 4MATIC2026

Listing a model year does not mean every vehicle of it is concerned: the document says which.