Join Date: Jun 2015
Location: Oahu, Hawaii
Car Year & Model: 2016 GLA250
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 190 Post(s)
It does seem to be a known problem. If you search on "Eco Start/Stop" in the Search box, you'll find lots of discussion on it, much of it from me. I can go several days of no operation and when that has happened in the past the Eco system has dropped out, very hard to resuscitate. If you read about the Eco system in your console digital operator manual, there are quite a few engine/auto system parameters that need to cooperate for it to activate.
As a personal history, the first time mine went out dealer service replaced the auxiliary battery. That lasted maybe a month. The second time they did a manual re-programming of the computer code. That lasted about 2-3 months. The third time...not sure what they did, as they said it worked fine on their check. It lasted a couple weeks, then went out. It was just after that time the light came on for me that not operating it frequently does degrade the system, perhaps not enough charge to the auxiliary battery. I believe, but am not certain, the regenerative braking system (one of the driver console screen gauges with Range, Consumption, and Max Charge...goes green when you are braking) is an indicator of the auxiliary battery getting charged.
That said, mine last stopped working at the end of January 2017. It was just in for the first B Service, and the Eco was again repaired, said to have done a software update, whatever that means. Three days later, it's still working. Knock on wood! However, another member was recently having his second or third bout of Eco going inop, took it in for repair, and reported essentially the same fix, a software upgrade. Perhaps there is a new fix out, so I'd encourage you not to endure it for 10 months like I did, get it checked out at a dealer. For the driving I do on an island, it seems to make a 2 MPH difference. Please keep us posted and may the Force be with you.
2016 GLA250 FWD
Cirrus White, Brown Leather Upholstery, Burl Walnut Trim
Interior, Premium, Driver Assistance, Sport Packages
Rearview Camera, Power Passenger Seat With Memory
Bi-Xenon Headlights, LED Taillights