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I own a 2015 MB C300 sedan. This morning a system message
I own a 2015 MB C300 sedan. This morning a system message appeared on the center screen (same screen that shows speedometer, etc.) saying Auxiliary Battery Malfunction. I have only owned the car for 4… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
It say battery malfunction but there is not an aux battery
It say battery malfunction but there is not an aux battery in my c300 so I'm thinking it's a capacitor. Looking to see how much it costs to buy one and how easy to repair it. … read more
Danny
Danny
Owner, lead mechanic
High School or GED
4,742 satisfied customers
Auxiliary battery malfunction. It came on while driving
It came on while driving haven't had time to investigate. What does it service ? … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
On starting the engine, the dashboard displayed “auxiliary
On starting the engine, the dashboard displayed “auxiliary battery malfunction” … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
I recently bought a 2015 C300 and the Multimedia system
I recently bought a 2015 C300 and the Multimedia system (Navigation, Radio, etc). is not working. The dealership (not an MB dealership) said they spoke to a Benz dealership and apparently there is a p… read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
4,460 satisfied customers
I also have a warning signal on my MB S550 2015 which says:
I also have a warning signal on my MB S550 2015 which says: Auxiliary battery malfunction. The car is still running well but for safety reason, I left it home today. … read more
eric remington
eric remington
FORMER SHOP OWNER/TECHNICIAN/INSPECTOR
associates degree
1,473 satisfied customers
How to charge a dead battery on a C300. No light come on.
Yes, I just opened the hood. I have a battery charger. … read more
Pete
Pete
Automotive Diagnostic Specialist
General auto certifications
30,257 satisfied customers
I am considering purchasing either a 2014 MBZ C250 sedan or
I am considering purchasing either a 2014 MBZ C250 sedan or a 2015 C300 4MATIC sedan. Both are CPO vehicles. Is one of these vehicles more reliable than the other? Which would you recommend for long t… read more
Tim Mohr
Tim Mohr
SHOP OWNER
Master's Degree
16,192 satisfied customers
I need to replace the 2009 s63 AMG aux battery but I need to
I need to replace the 2009 s63 AMG aux battery but I need to find its location. … read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
4,460 satisfied customers
I have a 2012 C300 4matic. I just changed out the auxiliary
I have a 2012 C300 4matic. I just changed out the auxiliary air pump but now I can't find the relay location in the fuse box. Can you tell me which one it is?… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
Battery location on my C300 2014 auxiliary battery. I I
battery location on my C300 2014 auxiliary battery … read more
Wolfgang
Wolfgang
Mercedes Technician
5,418 satisfied customers
A warning message on my E400 wagon says "auxiliary batter
A warning message on my E400 wagon says "auxiliary batter malfunction". As a result the cruise and hold function are not working. The owners manual does not mention an "auxiliary battery" … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
It lit up a warning light that says: "Alternate battery Low"
It lit up a warning light that says: "Alternate battery Low" … read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
4,460 satisfied customers
014 Mercedes Benz 350E, 2014 350E with message "Auxilliary
2014 350E with message "Auxilliary Battery Malfunction" … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
Auxiliary battery malfunction, do you think it is the main
service centre is 200kms from us and we want to know if it is likely to be something simple … read more
Dan
Dan
Dealership Technician
Associate Degree
2,202 satisfied customers
I a getting auxiliary battery malfunction continuous
I a getting auxiliary battery malfunction continuous flashing c300 … read more
BOBBYSS
BOBBYSS
Automotive Repair/Damage Investigator
Associate Degree
14,589 satisfied customers
The same car shows the auxiliary battery malfunction on the
The same car shows the auxiliary battery malfunction on the dash, what is the cause and what shall I do?… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
How to enable engine starter to a W205 C300 2015? I have
How to enable engine starter to a W205 C300 2015? I have SDConnect with 07/2015 software. there is an option on M.E to enable, but is there anything else that need to be enabled / reset? I did clear a… read more
Pete
Pete
Automotive Diagnostic Specialist
General auto certifications
30,257 satisfied customers
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Meet the Experts:

MB Paul

MB Paul

Mercedes Technician

3,567 satisfied customers

Qualified Mercedes Benz Diagnostic Technician - 20+ years experience - Workshop Foreman for Mercedes

Marty

Marty

Mercedes Technician

29,460 satisfied customers

Bosch Certified Master Tech. Over 35 years experience.

Lou P. master tech

Lou P. master tech

Mercedes Technician

4,460 satisfied customers

20 years Master Certified excellent fix rate and have access to factory wiring, and instructions.

Michael Warfield

Michael Warfield

Factory Mercedes-Benz Technician

3,132 satisfied customers

Mercedes-Benz Master Certified technician

Matt

Matt

Engineer

643 satisfied customers

Mechanical Engineer with 23 years experience in the auto industry, 8 yrs in formula 1 engine testing

promerc

promerc

mercedes diagnostic technician

553 satisfied customers

Qualified mercedes diagnostic technician & service team manager , ATA registered Master tech

Hipo64

Hipo64

Mercedes Technician

444 satisfied customers

Work and diagnose electronics on daily basis.

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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