C43 2017 Wont crank/won't start!

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Oct 23, 2018 | 12:56 AM

JohnC43amg

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Joined: Feb 2018

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C43amg Year2017

C43 2017 Wont crank/won't start!

Hi Guys
I am very new to the site. I bought a C43 2017 brand new 8 months ago running fine till the last couple of days ago.
so far twice happened when starting the Engine it won't crank or do anything.
then I waited a min then try again the engine starts fine.
I haven't phoned the dealer yet. but does anyone experience this issue?
Please help..

Thanks in advance.
John

Oct 23, 2018 | 01:12 AM

waisoserious

Super Member

Joined: Feb 2016

Posts: 697

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From: Taiwan

GLC43, X P100D, S P100D, CT200H

Quote:

Originally Posted by JohnC43amg

Maybe you should have phoned the dealer first?

Is the battery dead? Does it make any sounds? Does it sound like the engine is choking or just silence?

Oct 23, 2018 | 01:49 AM

JohnC43amg

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C43amg Year2017

When I hit the start button the dashboard lights come on but Engine is silence.
then I wait after 30 seconds and try again then Engine starts ok.
I don't understand what this could be..

Oct 23, 2018 | 02:09 AM

AMG C43 3LV6

Super Member

Joined: Jun 2018

Posts: 522

Likes: 35

AMG C43 3LV6

Quote:

Originally Posted by JohnC43amg

When I hit the start button the dashboard lights come on but Engine is silence.
then I wait after 30 seconds and try again then Engine starts ok.
I don't understand what this could be..

Dont need to understand what it is, take it immediately to the dealer its still under warranty.

Oct 23, 2018 | 03:06 AM

MarcusDubya77

Senior Member

Joined: Sep 2018

Posts: 484

Likes: 67

From: Schonaich, Germany

19 C43 Coupe, XC 60

Sounds like an ECU fault of some sort.

Oct 23, 2018 | 03:11 AM

guhvies

Super Member

Joined: Feb 2006

Posts: 798

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From: Bromley, UK

2017 C43 AMG Saloon

Dumb question, but is your brake pedal fully pressed in when hit the button to start?

Oct 23, 2018 | 08:15 AM

JohnC43amg

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Newbie

Joined: Feb 2018

Posts: 6

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C43amg Year2017

Quote:

Originally Posted by guhvies

Dumb question, but is your brake pedal fully pressed in when hit the button to start?

yes good point ,when you press the brake pedal it is fully pressed.

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Oct 24, 2018 | 01:06 PM

Abohunu

Member

Joined: Jun 2016

Posts: 83

Likes: 9

W205 C250 2016

Actually if you press START and right away you depress the break pedal the engine will stop. For some reason the ECU will stop the ignition process if you don't wait a few seconds after the pressing START + break.

Oct 24, 2018 | 06:23 PM

#10

jonathan358

Super Member

Joined: Nov 2017

Posts: 711

Likes: 108

2018 Mercedes C43 AMG Coupe

Yeah, like others have said, just make sure you depress fully. It's sensitive like that...

And for me, an intermediate-length full press of ignition, never hold or quickly release the button.

Nov 2, 2018 | 11:11 PM

#11

Tirgoman

Super Member

Joined: Nov 2018

Posts: 510

Likes: 64

From: Dallas Texas USA

2023 AMG EQE 53

I would bet it a Mis-adjusted brake light switch or the car has lost some vacuum. The brakes use engine vacuum and if it sits when you press the brake peddle it's not enough to activate the brake light switch so the ECU tells the engine e to crank, safety thing. Try really pressing hard and if it cranks go to the dealer and have him find the vacuum leak or adjust the brake light switch. My wife's MB had this problem

Nov 2, 2018 | 11:29 PM

#12

HTXgearhead

Senior Member

Joined: Apr 2018

Posts: 402

Likes: 128

From: Houston

2018 C43 sedan

Quote:

Originally Posted by sieglo

There's no such thing as a dumb question on this board.

Yes there is.

https://mbworld.org/forums/c-class-w...k-what-do.html

Nov 3, 2018 | 12:13 PM

#13

CA400

Senior Member

Joined: Jan 2018

Posts: 296

Likes: 66

From: SF BAY AREA

C400

Quote:

Originally Posted by HTXgearhead

Yes there is.

https://mbworld.org/forums/c-class-w...k-what-do.html

HAHAHAHA

Nov 3, 2018 | 12:17 PM

#14

CA400

Senior Member

Joined: Jan 2018

Posts: 296

Likes: 66

From: SF BAY AREA

C400

I agree with making sure the brake pedal is fully engaged. Also is the key inside the car fully? I sometimes am in a hurry and just stick my right foot in to press the break pedal and reach for the start button while the key is in my left pocket. The car doesn't read the key until I sit and put my left leg in. I do this when I run out to warm the car up.

Just a though!

Alex