Mercedes-benz P179a12 [ EXCLUSIVE ]

The ISM is an electronic control unit mounted on the side of the transmission. It physically moves the transmission's internal shift lever based on the driver's electronic gear selection.

However, I can provide you with the most likely technical explanation based on Mercedes-Benz proprietary diagnostics and engineering logic. The structure below serves as an expert technical brief. mercedes-benz p179a12

Because the car cannot confirm it is in Park, it may display this warning. The ISM is an electronic control unit mounted