That's a new one on me. Try posting in Tech Help, or email Gilly directly. He's the moderator of the ML and G-Wagen forum. When you find out the cause, please come back and let the rest of us know.

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Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References