E350 battery
Problem with starting E350?
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1911 E350 4matic
Problem with starting E350?
Hi, this is my first time posting on this site, I hope I'm in the right forum.
I have a Mercedes E350 2011 4 matic.
Most of the time, my car starts normally, however, occasionally, we need to boost it with another car battery. It's very sporadically happening, and enough for me to think there's a problem.
We have checked the battery and it appears to be working well. And also, when I exit my car, I make sure everything is off. I was on vacation for two weeks and came to start the car, and there was no problem starting the car.
Therefore, I thought that if it had been sitting there for so long and was able to start, it couldn't have been a battery problem. But then, two days later, we had to boost it. I'm thinking it might be something electronic maybe. I still feel there is something electronic that is running the battery occasionally in the background, and I don't know.
Any help or suggestions?
I have a Mercedes E350 2011 4 matic.
Most of the time, my car starts normally, however, occasionally, we need to boost it with another car battery. It's very sporadically happening, and enough for me to think there's a problem.
We have checked the battery and it appears to be working well. And also, when I exit my car, I make sure everything is off. I was on vacation for two weeks and came to start the car, and there was no problem starting the car.
Therefore, I thought that if it had been sitting there for so long and was able to start, it couldn't have been a battery problem. But then, two days later, we had to boost it. I'm thinking it might be something electronic maybe. I still feel there is something electronic that is running the battery occasionally in the background, and I don't know.
Any help or suggestions?
Out Of Control!!
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2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster
It could still be the battery... Put a voltmeter to it and see what it's resting voltage is ... When did u last change the battery?
Last edited by PeterUbers; Nov 27, 2014 at 11:58 PM.
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2014 E350 also restored: 1969 Camaro convertible SS 1957 Chevy Belair 2dr hardtop
would change the battery. Even if it looks ok it is 4 years old and that is long enough on a battery. If it still does it at least you went with the cheapest part first.
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From: Sidney, BC
2009 SLK55 AMG. & 2022 GLA250 4Matic
Battery
Hi, this is my first time posting on this site, I hope I'm in the right forum.
I have a Mercedes E350 2011 4 matic.
Most of the time, my car starts normally, however, occasionally, we need to boost it with another car battery. It's very sporadically happening, and enough for me to think there's a problem.
We have checked the battery and it appears to be working well. And also, when I exit my car, I make sure everything is off. I was on vacation for two weeks and came to start the car, and there was no problem starting the car.
Therefore, I thought that if it had been sitting there for so long and was able to start, it couldn't have been a battery problem. But then, two days later, we had to boost it. I'm thinking it might be something electronic maybe. I still feel there is something electronic that is running the battery occasionally in the background, and I don't know.
Any help or suggestions?
I have a Mercedes E350 2011 4 matic.
Most of the time, my car starts normally, however, occasionally, we need to boost it with another car battery. It's very sporadically happening, and enough for me to think there's a problem.
We have checked the battery and it appears to be working well. And also, when I exit my car, I make sure everything is off. I was on vacation for two weeks and came to start the car, and there was no problem starting the car.
Therefore, I thought that if it had been sitting there for so long and was able to start, it couldn't have been a battery problem. But then, two days later, we had to boost it. I'm thinking it might be something electronic maybe. I still feel there is something electronic that is running the battery occasionally in the background, and I don't know.
Any help or suggestions?
You need to check to see if you have two batteries before you do anything.
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From: Sidney, BC
2009 SLK55 AMG. & 2022 GLA250 4Matic
I checked with my dealer and he tells me there is only one battery in the W212.
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2021 Mojave Silver E450, 2024 Black on Black Jaguar F-pace P400, 2011 335d (RIP), 2010 E350 (sold)
I believe all W212s have 2 batteries BUT the second is not what you think. The second is called an auxiliary battery and it is only used to partially power the console to enable shifting the car into neutral (electric gear shifter) in case the car won't start and it needs to be towed. The only reason I know this is because I got a warning light saying Aux bat low and I asked about it when it was replaced under warranty. Now is it possible that my SA was full of it or didn't know the real truth, sure, but this is the story that he gave me.
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2018 E300 Luxury - P3 and more
OP has a 2011, so there are indeed two batteries, the main battery and the auxiliary battery for the transmission.
For 2014+ W212, there are 3 batteries: 1) Main battery, 2) Auxiliary (transmission) battery, 3) ECO Start/Stop battery which powers the electronics when the engine's off.
For 2014+ W212, there are 3 batteries: 1) Main battery, 2) Auxiliary (transmission) battery, 3) ECO Start/Stop battery which powers the electronics when the engine's off.
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'24 Porsche Macan
OP has a 2011, so there are indeed two batteries, the main battery and the auxiliary battery for the transmission.
For 2014+ W212, there are 3 batteries: 1) Main battery, 2) Auxiliary (transmission) battery, 3) ECO Start/Stop battery which powers the electronics when the engine's off.
For 2014+ W212, there are 3 batteries: 1) Main battery, 2) Auxiliary (transmission) battery, 3) ECO Start/Stop battery which powers the electronics when the engine's off.
I only knew about two batteries (under hood: I believe for starting and with posts for jump-starting, in trunk: I thought for ECO to power accessories when engine is off). Where is the third battery? Anyone know the precise function of each, in case I was mistaken?
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'71 Pinto
1.2AH battery is backup for transmission electronic gear selector apparently sometime during production run MB removed this battery, best way to confirm if vehicle is equipped with said battery is to run VIN.
Last edited by konigstiger; Jan 17, 2015 at 04:00 PM.
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