Did you get this issue resolved ?? I am having the exact same problem... Parking brake won’t release... I also have a 2013 ML350

I have a 2013 Mercedes ML350 and I’m getting the message “Parking Brake See Operator Manual” and the yellow parking brake light stays on also. I stopped using my parking brake because the left rear brake was getting stuck and won’t disengage so I would have to play with the parking brake switch to get it to unlock.
I replaced the parking Brake switch but the lights still stay on. I did a computer diagnostic and got 2 faults with the Parking Brake.
1. The position of component Electric Parking Brake is Implausible
2. The left brake caliper is faulty. An open circuit exists.
Can someone tell me if this could be a faulty sensor on the left rear wheel or something else?

 

Having the same issue, can someone help?
Last events before this happened, my Son accidentally oppend the door while I was driving at a very very slow speed like 1-3km/h, the emergency brake got engaged. Next is a good clean car wash which then back home and see this error.
Can somebody help.

 

I had this problem too and had a bad motor at the rear caliper.