Need jump start to start
Thread Starter
Newbie
Joined: Feb 2022
Posts: 7
Likes: 0
From: Canada
2014 E350 COUPE
Need jump start to start
Hello everyone.
I am not sure if your 2014 e350 coupe needs a jump start to start. The battery is good, occasionally it goes dead, sometimes the auto start stop doesn't work, steering wheel assist disappears, 360 camera no assist line, but after driving for a while the auto start/stop will work again.
When I notice the battery is dead, I charge the battery with the charger, but to no avail, it still won't start. When I use jump start to start the car, all functions are normal. But it won't last long. I want to know if I need to replace the auxiliary battery.
I went to dealer many times to check and I couldn't find the reason.
If this is happening to your car, please let me know how you fixed it. I will try it on my car.
Thank you in advance.
I am not sure if your 2014 e350 coupe needs a jump start to start. The battery is good, occasionally it goes dead, sometimes the auto start stop doesn't work, steering wheel assist disappears, 360 camera no assist line, but after driving for a while the auto start/stop will work again.
When I notice the battery is dead, I charge the battery with the charger, but to no avail, it still won't start. When I use jump start to start the car, all functions are normal. But it won't last long. I want to know if I need to replace the auxiliary battery.
I went to dealer many times to check and I couldn't find the reason.
If this is happening to your car, please let me know how you fixed it. I will try it on my car.
Thank you in advance.
Last edited by Marvin-X; Oct 2, 2022 at 11:50 PM. Reason: wrong language
Senior Member
Joined: Jul 2008
Posts: 296
Likes: 65
2015 E400
What's the voltage of the battery after charging? It sounds like there's a problem with your charging system, i.e, alternator not supplying enough or battery not able to hold charge. How old is the starter battery? If it's older than 4 or 5 years, you probably should replace it.
Last edited by pl626; Sep 30, 2022 at 07:29 AM.
Thread Starter
Newbie
Joined: Feb 2022
Posts: 7
Likes: 0
From: Canada
2014 E350 COUPE
I replaced the battery with a new one 1 month ago, even though they tested it and said my original battery was good.
I think there should be no problem with the alternator because every time the battery was lack power when I drove for a while, some functions came back to normal.
I'm wondering if there is something wrong with the auxiliary battery, aging or some leakage that is preventing it from starting.
Because I know the auxiliary battery mainly powers the dashboard and electronic steering wheel boost, multimedia.
Every time there is a lack of power, the steering wheel assist disappears and the yellow auxiliary line of the 360 camera disappears.
I think there should be no problem with the alternator because every time the battery was lack power when I drove for a while, some functions came back to normal.
I'm wondering if there is something wrong with the auxiliary battery, aging or some leakage that is preventing it from starting.
Because I know the auxiliary battery mainly powers the dashboard and electronic steering wheel boost, multimedia.
Every time there is a lack of power, the steering wheel assist disappears and the yellow auxiliary line of the 360 camera disappears.
Super Member
Joined: Nov 2017
Posts: 669
Likes: 142
From: Hermosa Beach, California
2018 E400 Coupe
This is weird! Why is the original post in Chinese?
Senior Member
Joined: Jul 2008
Posts: 296
Likes: 65
2015 E400
LOL, I used the browser translate to read, but there was definitely something lost in translation.
OP - Can you take a voltmeter and measure the voltage on the battery when engine is off? Also, what's the reading when the engine is on?
OP - Can you take a voltmeter and measure the voltage on the battery when engine is off? Also, what's the reading when the engine is on?
Thread Starter
Newbie
Joined: Feb 2022
Posts: 7
Likes: 0
From: Canada
2014 E350 COUPE
Sorry about that, I forgot to use English. ^-^.
My friend checked it for me a few days ago. I forget the exact number, I will check again recently.
At that time, only the values when the engine was off were checked and showed normal.
Thanks，
My friend checked it for me a few days ago. I forget the exact number, I will check again recently.
At that time, only the values when the engine was off were checked and showed normal.
Thanks，
Senior Member
Joined: Jul 2008
Posts: 296
Likes: 65
2015 E400
If this reading is below 14v when the engine is on, you most likely have an alternator issue.
Trending Topics
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
Senior Member
Joined: Jul 2008
Posts: 296
Likes: 65
2015 E400
I'd still use a dedicate volt-meter to measure charging system capacity. You can always pick up a cheap multi-meter at any autoparts store or online. You don't need to have an expensive Fluke. I keep a multi-meter in each of my vehicles.
Thread Starter
Newbie
Joined: Feb 2022
Posts: 7
Likes: 0
From: Canada
2014 E350 COUPE
hi,
I measured it with a multimeter and it was a completely normal value. When the car is completely dormant the voltage is 0.06. My car has no problems found now.
I now find that when the battery connection is taken off and reconnected, the car does not have a problem. I consulted with the mechanic and he said that maybe there is a problem with one of the modules but it will take a lot of time to find it.
cheers,
I measured it with a multimeter and it was a completely normal value. When the car is completely dormant the voltage is 0.06. My car has no problems found now.
I now find that when the battery connection is taken off and reconnected, the car does not have a problem. I consulted with the mechanic and he said that maybe there is a problem with one of the modules but it will take a lot of time to find it.
cheers,
Super Member
Joined: Aug 2004
Posts: 954
Likes: 245
E550 Coupe 2wd (2016)
Fyi the Eco start/stop was the first thing to go when my batt was getting low. It actually did this maybe a year before I noticed any other issues. The next issue, if I recall correctly, was the rear camera would randomly not work. Then a couple months later it started to randomly misfire at idle, then days later misfire at low rpm driving. The batt was something like 6 years old? It had lower voltage than a new one but certainly not low enough to cause issues, and should never cause issues once the eng was running, but it did. A new batt fixed it. Since the low batt can't physically cause those issues, I firmly believe the ECU simply creates the problems. The Eco start/stop fail is for a reason; they don't want people to see Mercedes dying all over town and blocking traffic so it only works if it's sure the batt is tip top. Since the car is clearly capable of checking voltage when it's off, no doubt cranking voltage too, it's not a stretch to believe they added the other issues. I'd assume it's to get you take it to the dealer so they squeeze you for $ because what other reason is there?
On my backup cam it was either a completely black screen or black with the yellow lines.
I still have the oem aux batt, which I suppose I should change too but I read it's only function was to ensure the tranny could be put in Park if the main bat was dead. Probably does other things but that's all I could find on the subject. It is odd that my aux batt is rather large (12AH), larger than most MB aux batts and clearly overkill for Park.
On my backup cam it was either a completely black screen or black with the yellow lines.
I still have the oem aux batt, which I suppose I should change too but I read it's only function was to ensure the tranny could be put in Park if the main bat was dead. Probably does other things but that's all I could find on the subject. It is odd that my aux batt is rather large (12AH), larger than most MB aux batts and clearly overkill for Park.
