20 Most Recent 2013 Mercedes-Benz Sprinter - Page 4 Questions & Answers

I think you mean PSM Paramatizeable special module Basically it allows after market solutions for specialist equipement to talk to the on board control modules basically an interpreter for say a company to install a device it could specify that the device only works when the vehicle is stationary and would require data from the wheel sensors to do this ( this is just an example of many applications)

The "Drive" you speak of is Overdrive.Youve lost connection to it.Possibly the brake pedal switch under dash has burned out and not putting power to the trans for overdrive.When you touch the brake pedal,overdrive goes off.When released,overdrive can come back on when at spped to do so.This switch could possibly just have come unplugged also.Check this first and plug it back in and drive it.

there is a SWB model Short Wheel Base, the only reference to WSM is the town of Weston Super Mare who do have a large Merc dealership so they may put there own badge on the vehicles they retail

can you recheck these codes as not listed with merc site , codes are four numbers preceded by a P follow this link for examples Mercedes Check Engine Light Codes Welcome to the Mercedes Check Engine...