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Suddently my CLA started stalling or reseting when ever it goes into the start stop at a red light. The car shuts off the engine and when i take the foot off the break it completely shuts off the car and resets the dash. Then i get a service warning and i have to pitnthe car in parm and restart. The only way it doeant happen its if i shut off the start stop button. Has this happened to anyone?
 

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Maybe its just the aux battery going bad
If not then the service teams will need to see what error codes are stored
Turn off eco for now until fixed lest you kill the main battery as well
 

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Gonna agree with JMC here, i had a lot of weird issues going on that were sort of similar to what you're describing (a little bit different circumstances) took it to the dealer and the aux battery was "low voltage" i guess it was going bad somehow.
Would cause my car to randomly shut off/force neutral, throw up transmission errors/service warnings until i turned it off/on.
 

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I just ran into this issue on my way to pick up my kid from school. Same exact thing. Turned off the start stop and it stopped happening. I got a check engine light, the don't shift gears message, but with the start stop off car wasn't stalling anymore. Got the kid drove home and headed to my buddy's shop to have the code read, however when I turned the car on the check engine light was gone. I did get the ODB reader and it showed a code of p060a. I'm hoping it's something as simple as the battery as i've driven several miles with the start stop turned off with no problems and light hasn't came back.

Quick google search shows the code as some sort of PCM issue which sounds scary. What ended up being the problem on your car? I have a 2015 CLA 250, i'm thinking about going out and see if I can recreate the problem.
 

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So went out recreated the same problem and sure enough at a long red light with the Start Stop activated the car just stalled same warning message but no check engine light this time. I assume it was because I didn't put my foot on the peddle to wake the car up. Other than that car is operating normally so long as I turn off the Start Stop. As soon as I get a chance i'm gonna run the batteries over and get them tested, or I may just buy the aux battery.
 

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This morning I went to warm the car up for the commute to work and I immediately get a message saying there was a “auxiliary battery malfunction” or something along those lines. So looks like it’s pointing towards that. I’ll swap it out in the next day or two.
 

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What was did you find out I’ve been having the same problem

This morning I went to warm the car up for the commute to work and I immediately get a message saying there was a “auxiliary battery malfunction” or something along those lines. So looks like it’s pointing towards that. I’ll swap it out in the next day or two.
d
 

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Suddently my CLA started stalling or reseting when ever it goes into the start stop at a red light. The car shuts off the engine and when i take the foot off the break it completely shuts off the car and resets the dash. Then i get a service warning and i have to pitnthe car in parm and restart. The only way it doeant happen its if i shut off the start stop button. Has this happened to anyone?
Hello! Did you ever find a resolution to this issue??? My CLA started doing the exact same thing yesterday. I called MBUSA and they said they are aware of this happening a lot but there isn't a recall. Very strange since they get many complaints.
 

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Hello! Did you ever find a resolution to this issue??? My CLA started doing the exact same thing yesterday. I called MBUSA and they said they are aware of this happening a lot but there isn't a recall. Very strange since they get many complaints.
I had to take my cla250 2014 to the Mercedes dealership to tell me I had bad battery. It’s also good to take it because they run updates on the car too but of course your gonna pay a service fee 100 bucks. I ended up having to change my main battery and aux battery about 400 bucks at a local mechanic shop not the dealers. The car runs smooth again but I never drive with the eco mode on I manually switch it off.
 

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I had to take my cla250 2014 to the Mercedes dealership to tell me I had bad battery. It’s also good to take it because they run updates on the car too but of course your gonna pay a service fee 100 bucks. I ended up having to change my main battery and aux battery about 400 bucks at a local mechanic shop not the dealers. The car runs smooth again but I never drive with the eco mode on I manually switch it off.
Thank you for the info! I used to switch it off but I haven't lately. I was wondering if the aux battery isn't charging because I haven't been driving it much since March except 2 times a week. I used drive it 6-7 days. I drove yesterday with eco off and it never stalled.....the only two times it stalled...eco was on.
I guess I will take it to Mercedes to have it checked just in case.
 

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Suddently my CLA started stalling or reseting when ever it goes into the start stop at a red light. The car shuts off the engine and when i take the foot off the break it completely shuts off the car and resets the dash. Then i get a service warning and i have to pitnthe car in parm and restart. The only way it doeant happen its if i shut off the start stop button. Has this happened to anyone?
Its the faulty fuel pump problem. I had same problem with my 2016 cla250. Benz replaced my fuel pump under warranty and everything is running good now.
 

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Hello! Did you ever find a resolution to this issue??? My CLA started doing the exact same thing yesterday. I called MBUSA and they said they are aware of this happening a lot but there isn't a recall. Very strange since they get many complaints.
It just started happening to my CLA also. What is the remedy?
 

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For my 2014 cla250 it was the aux battery and my main battery that fixed the problem. The car runs fine but I manually click the eco mode off I don’t like driving with it on anyways.
 
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