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Registered 2014 SLK350
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23 Posts
Discussion Starter #21
Yes, I bought the car used from a MB dealership. The factory MB warranty that I also purchased specifically states that any warranty work done outside of Canada would have to be paid for, with reimbursement when I arrived back to Canada.
 

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Super Moderator CA 2012 SLK55 AMG w/P30
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14,213 Posts
@kplange thanks for the updated info (y)
 

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Premium Member 2013 SLK55 AMG
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1,846 Posts
Yes, I bought the car used from a MB dealership. The factory MB warranty that I also purchased specifically states that any warranty work done outside of Canada would have to be paid for, with reimbursement when I arrived back to Canada.
Apologies, I had a geography failure, your US flag threw me!
I understand why your Warranty isn’t transferable now.
TonyS
 

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Registered 2014 SLK350
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23 Posts
Discussion Starter #25
Apologies, I had a geography failure, your US flag threw me!
I understand why your Warranty isn’t transferable now.
TonyS
My fault. I noticed the U.S. flag too, but haven't had the time to figure out how to change it yet.:)
 

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Registered 2015 SLK200
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97 Posts
Matt123
will be aux bat imo. i took mine out intentionally to disable it. need to run the diagnostic to be 100%
I disconnected the sensor attached to the neg clamp of the starter battery, this deactivates brake hold and stop/start. Does disconnecting the aux battery also deactivate brake hold?, I never used brake hold so the loss was of no consequence to me.

You don`t stop/start, it`s bad for your car and your pocket.

There are two main systems active when the starter battery sensor is connected, (1) stop/start (2) smart charging, it`s the smart charging regime that causes the low battery problem on short journeys. With the sensor disconnected both batteries get fully charged even on short journeys.
When smart charging is deactivated the EMU puts the alternator into a standard continuous charging regime of between 13.8 and 14.2 volts, with smart charging in play charging is intermittent between 12 volts (no charge) and up to 16 volts ( fast regeneration ) from braking and overrun etc, to make room for this fast 16 volts the EMU will not allow the alternator to charge the battery under engine power above 75/80%, that`s the reason the battery can remain near to flat on short journeys, little regeneration = near to flat battery = shorter battery life.
I also own 2 other cars, a C-Class coupe 1.8 CGI petrol which in my ownership has always had the system switched off, the sensor was disconnected over a year, both batteries are original on that car and dated 0911, both batteries still hold an overnight charge of 12.8 volts at over 8 years old. I also have a Porsche Cayman 981 which also has the sensor disconnected, the car drives perfectly with no issues.

I am sure members are aware that R172 1.8 engine has a weak single row timing chain which is failing earlier on turbo cars fitted with stop/start. One of the reasons I deactivated stop/start was because of that chain, each extra start has to overcome the moment of inertia, this puts immense stress on the timing chain probably more or equal to flat out acceleration. The average lifetime starts with stop/start activated is accessed at around 600,000 as against 60,000 without. The initial reason though was the system itself, I just don`t want it on my car.
 

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Registered 2014 SLK350
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7 Posts
I have the same car and the same year, and I had the same symptoms about 2 months ago. I am like you....maybe not a big fan of the eco start/stop, but like my car to work the way it is designed. I had the auxiliary battery replaced and all is well.
 

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Registered 2014 SLK350
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23 Posts
Discussion Starter #28
I have the same car and the same year, and I had the same symptoms about 2 months ago. I am like you....maybe not a big fan of the eco start/stop, but like my car to work the way it is designed. I had the auxiliary battery replaced and all is well.
Thank you. I hope that's all it is. The majority of the posts seem to agree with you. I don't know if that is covered by warranty or not. I'll have to see what is involved in changing it myself.
 

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Registered 2014 SLK350
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7 Posts
Thank you. I hope that's all it is. The majority of the posts seem to agree with you. I don't know if that is covered by warranty or not. I'll have to see what is involved in changing it myself.
My car no longer has a warranty, but about a year ago when I did, the dealer did replace the main battery under warranty.....If that helps.
 

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Registered 2014 SLK350
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23 Posts
Discussion Starter #30
I don't have that kind of luck.:( I'll read my warranty over tomorrow when I have time. Or....as others have stated, I might just have to take it on a few longer drives to charge it up.
 

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Registered 2015 SLK200
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97 Posts
My battery is over 8 years old, my Merc is used 2 to three times a week mainly for short journeys, I am retired, both batteries remain fully charged and car starts instantly each time. Stop/start is bad for the battery, bad for the mechanics and bad for your pocket and is intermittent. Smart charging causes the battery to remain near to flat on short journeys, these two systems give minimal fuel gain.
I really don`t understand why some are so concerned when these 2 useless systems stop working, they are only there for the manufactures to achieve their emission targets. Why should you need a battery charger when the car is in regular use, this low battery issue never occurred in cars prior to March 2011.

AGM AFTERMARKET FALTERS AS DRIVERS DISABLE START-STOP FUNCTION

 

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Registered 2014 SLK350
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23 Posts
Discussion Starter #32
I don't have that kind of luck.:( I'll read my warranty over tomorrow when I have time. Or....as others have stated, I might just have to take it on a few longer drives to charge it up.
Here's an update on my non operable ECO. It continued not to work for the remainder of my time down South (around five months). Brought it home (1864 miles) with no change. I'd have thought a trip like that would charge up the battery:). Assuming that the battery is completely dead, would not some of the other options also not be working? Incidentally, while sitting in the car today with the key in the second position to change some of the settings, I noticed that the ECO light on the dash bezel, as well as the light on the lower speedometer bezel were now lit up. Unfortunately, as soon as I started the car, both went out. Any ideas what is happening? Thanks.
 

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Registered 2014 SLK350
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23 Posts
Discussion Starter #34
Not yet, as I don't know if this is going to be covered by my MB extended warranty. I didn't want to shell out $100 for a battery on my own, just to find out that it wasn't needed. My closest dealer is over an hour away, so this issue will probably be put on the back burner for a while, with everything else that's going on.
 

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Super Moderator CA 2012 SLK55 AMG w/P30
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14,213 Posts
Not yet, as I don't know if this is going to be covered by my MB extended warranty. I didn't want to shell out $100 for a battery on my own, just to find out that it wasn't needed. My closest dealer is over an hour away, so this issue will probably be put on the back burner for a while, with everything else that's going on.
A lot of folks here hate that ECO ability and have disabled it.
A lot of folks here love that ECO ability and choose to replace the battery (usual fix).

Your choice as to what you choose to do (y)
 
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Registered 2014 SLK350
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23 Posts
Discussion Starter #36
Agreed. I just prefer to have every option working, whether I use it or not. I was just throwing my latest observations out there in hopes that it might trigger some new discussion. The fact that the bezel light and ECO indicator on the lower speedometer will now light up when the key is in position two, but goes out when started is something that has just recently happened.
 

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Premium Member 2014 SLK200
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2,364 Posts
Presumably the fact that the light/indicator come on and then go off is a function of an onboard system test - it's looking to enable that feature but parameters are not satisfied and is then rendered unavailable - maybe?

Sort of opposite to check engine light which appears on start up but then stays on if there is an issue.
 

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Registered 2014 SLK350
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23 Posts
Discussion Starter #39
A little update here on my non functional ECO system. I've finally got around to booking my car in for my scheduled B1 service next week. I mentioned the ECO problem to the service advisor and he seemed to be in full agreement with most of you that it is likely the auxiliary battery, since I'm not receiving any error messages. I've now put the auxilliary battery on my battery tender. All it's showing is a fully charged battery, but the amber charging lite on my CTEK tender is flashing rapidly. The CTEK manual indicates that this could be a either a sulphated or "broken" battery or so far discharged that it won't accept a charge. I'll keep it on charge over night and see if there's any improvement in the morning.
Meanwhile, I checked with the nearest MB dealership and they have a battery in stock for $168 Canadian plus $20 core charge. I'm thinking of taking the old battery out prior to my trip up there next week, so that I have a core to give them. I'd install the new battery myself when I get home (70 mile round trip). Would there be any problems associated with running without an auxiliary battery for that amount of time? Thanks.
 

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Registered 2012 SLK55 AMG w/P30
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3,511 Posts
No problem running without the auxiliary battery. I would make sure that you insulate the battery terminals so they don’t short to ground though.
 
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