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My 2012 E350 won't start

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Old 02-04-2017, 07:22 PM
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2012 Mercedes E350
Originally Posted by SoCal208
MB W212 model year 2012 DO NOT HAVE auxiliary battery. Only ONE big old 12v battery (front passenger side, close to the firewall). Alternator may be your problem. Until model year 2014 > up (with stop & start in traffic that need an auxiliary battery). I can not locate any 2nd in my car, my mechanic told me my car had ONLY 1 battery.
ok so I diagnosed the car. It gave me a code p0356 stating ignition coil failure / secondary circuit. Any suggestions or thoughts on about this?
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Old 02-04-2017, 07:26 PM
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No code for anything else? You have 6 coils and now you need to find the bad one.
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Old 02-04-2017, 08:41 PM
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2008 E350 4Matic, 2011 E350 4matic
Originally Posted by SoCal208
MB W212 model year 2012 DO NOT HAVE auxiliary battery. Only ONE big old 12v battery (front passenger side, close to the firewall). Alternator may be your problem. Until model year 2014 > up (with stop & start in traffic that need an auxiliary battery). I can not locate any 2nd in my car, my mechanic told me my car had ONLY 1 battery.
Did you follow the link posted earlier? It's in the dash. You have to open the door to access it. Here's a guy who changed his on his 2012 W212. Check out the pictures in the post. Maybe it's time for a new mechanic.

https://mbworld.org/forums/e-class-w...ml#post6930867
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Old 02-04-2017, 11:35 PM
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2012 Mercedes E350
Originally Posted by LILBENZ230
A fuel pump will not cause the red battery warning in the cluster.

nope just that. What do you think ?
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Old 02-04-2017, 11:38 PM
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2012 Mercedes E350
Originally Posted by KEY08
No code for anything else? You have 6 coils and now you need to find the bad one.
nope that's the only code for I got . I diagnosed it. What came out was that code for the ignition coil only? What do you think? Would that be the problem ?
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Old 02-05-2017, 08:11 AM
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Originally Posted by MelvinC
So what do you think it is ?
I think it is most likely an alternator issue given the warnings you are getting. Until you get that sorted, I would not pay much attention to other warnings as the cars can act strangely when they're having voltage issues.
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