Leaky Benz May Throw Codes

Mercedes-Benz notes that some 2018 C300 vehicles may experience a no-start, instrument cluster messages (do not shift, visit workshop; ESP inoperable; active lane assist inoperable, etc.), water entry into the passenger side footwell, or possible multiple CAN fault codes/messages.

Mike Mavrigian

Information courtesy of Mitchell 1

Dec. 11, 2020

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This may be caused by missing body seam sealer under the battery tray or at the crossmember under the windshield.

Missing seam sealer can result in water intrusion on electrical connections. If missing, apply seam sealer P/N A 003 989 98 20.

Examples of missing sealer.

Example of applied seam sealer.

About the Author

Mike Mavrigian

Motor Age Editor

Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.

Information courtesy of Mitchell 1

Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.