Troubleshooting Curt Echo Brake Controller Not Powering Up on 2012 Mercedes-Benz GL550

Updated 10/23/2023 | Published 10/22/2023

Question:

2012 Mercedes GL550 with factory tow package. The echo wireless brake controller will not power up when plugged into the vehicle tow receiver.

asked by: Elmer S

Expert Reply:

It may be necessary to also plug in your trailer to the Echo # C51180 so your 2012 Mercedes-Benz GL550 sends 12V power back to the trailer, which in turn powers on the Echo.

Each vehicle is different when it comes to sending 12V power back to the 7-Way connection so sometimes it takes playing around with the setup to get that power. If you still don't get power to the Echo when your trailer is plugged in then I recommend plugging the trailer straight into the 7-Way to see if the issue is your vehicle sending the power or the Echo reading the power.

expert reply by: Jon G