Mercedes Benz

P0608 Control Module VSS Output “A” Malfunction P0609 Control Module VSS Output “B” Malfunction The OBD-II trouble codes P0608 and P0609 both relate to malfunctions in the vehicle speed sensor (VSS) output signals in the engine control module (ECM) or powertrain control module (PCM). P0608 - Control Module VSS Output “A” Malfunction: This code indicates that the ECM or PCM is not receiving the proper VSS signal from the VSS circuit "A". The VSS signal is used by the ECM or PCM to adjust various systems in the vehicle, such as the transmission, cruise control, and speedometer. A malfunction in this signal can cause a variety of drivability issues, such as harsh shifting, reduced fuel efficiency, or even stalling. P0609 - Control Module VSS Output “B” Malfunction: This code indicates that the ECM or PCM is not receiving the proper VSS signal from the VSS circuit "B". This signal is used by the ECM or PCM to adjust the same systems as circuit "A...