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December 19, 2025 Service bulletin

Complaint Oil residue in connector of transmission control unit in dual-clutch transmission models 724.0...

Mercedes-Benz technical service bulletin LI27.19-P-080155 for 2013-2026 Mercedes-Benz CLA250, 2015-2026 Mercedes-Benz GLA 250 and 2020-2026 Mercedes-Benz GLB 250 and others.

Bulletin number
LI27.19-P-080155
Component
Power train
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!

Owners of these vehicles have filed 112 complaints in the transmission category.

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