Is this normal? Ever since I got my car it will do this: If while the trans is in 1st gear I put the shifter in the 2nd position it will hold 1st and not upshift to 2nd. However if it is already in 2nd gear it will stay in that gear or down shift. Did MB put a 1st gear lock in these trans? In 3rd or D it has never done this.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200