Mercedes

Have Mercedes questions? Ask a mechanic for answers ASAP

Ask an Expert,
Get an Answer ASAP!

Sl550 2009 does not start at all but battery works fine

Customer Question
sl550 2009 does not start at all but battery works fine
Submitted: 2 years ago.Category: Mercedes
Ask Your Own Mercedes Question
Answered in 29 minutes by:
3/5/2016
Mercedes Mechanic: Marty, Mercedes Technician replied 2 years ago
Marty
Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 55,103
Experience: Bosch Certified Master Tech. Over 35 years experience.
Verified

Hi, my name is***** you give me a little more information? What is the background on this problem? Does the motor crank but not start?

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
no cranking; it had slow starts this morning but started; i drove it for about 20 minutes with two stops at which point it also had a slower start
Customer reply replied 2 years ago
when i parked the car and got back to it after 15 minutes the car did not start again without any cranking; road side assistance only checked and jumped the front battery without impact. I am thinking I should have someone jump the rear battery and see if that helps?I do have as suspicion that I left the light on over night so it would make sense for it to be a battery problem.
Customer reply replied 2 years ago
thoughts?
Mercedes Mechanic: Marty, Mercedes Technician replied 2 years ago

Sorry about the wait I had to step away

Ask Your Own Mercedes Question
Mercedes Mechanic: Marty, Mercedes Technician replied 2 years ago

It sounds like the starter battery under the hood is bad

Ask Your Own Mercedes Question
Mercedes Mechanic: Marty, Mercedes Technician replied 2 years ago

The battery in the trunk could also cause the problem but it is more likely to be a bad starter battery. Both batteries should be tested. Jump starting is only done at the battery under the hood.

Ask Your Own Mercedes Question
Mercedes Mechanic: Marty, Mercedes Technician replied 2 years ago

If a jump start from the battery under the hood did not help the battery in the trunk should be tested. It's also possible that there is a fault with the starter or with the transmission gear selector module. If the computer does not realize that the transmission is in park it will not activate the starter.

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
even if the rear battery is the problem road assistance would not be of any help and I would need to get the car towed? is the starter battery the one easily accesible under the hood? the mechanic checked the battery and the amp and considered it functional
Customer reply replied 2 years ago
> If the computer does not realize that the transmission is in park it will not activate the starter.I can only turn the key when the car is in neutral or park so I guess that eliminates that option?
Customer reply replied 2 years ago
are there any diagnosis tests I can run with the starter?
Mercedes Mechanic: Marty, Mercedes Technician replied 2 years ago

A jumper can be connected to the rear battery as long as the front battery is ok. You can connect jumpers to both to be sure. If you are comfortable with the vehicle electronics you can remove the starter relay and bypass the relay with a jumper lead to test the starter motor.

Ask Your Own Mercedes Question
Mercedes Mechanic: Marty, Mercedes Technician replied 2 years ago

You will need to remove the green relay and place a fused jumper lead from terminal 30 to 87 in the relay connector in place of the relay. When you make your connection the starter should operate.

Ask Your Own Mercedes Question
Customer reply replied 2 years ago
thank you; that is unfortunately too advanced for me; i will see if the road assistance person is comfortable in doing so; if the starter starts would that mean there is no issue with the battery and its an elctrical issue?
Mercedes Mechanic: Marty, Mercedes Technician replied 2 years ago

If the starter works it indicates a fault with the battery, cable connections or with the start authorization system that involves the computer and relay.

Ask Your Own Mercedes Question
Was this answer helpful?
Ask Marty Your Own Question
Marty
Marty
Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 55,103
55,103 Satisfied Customers
Experience: Bosch Certified Master Tech. Over 35 years experience.

Marty is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible.

CharlesWalnut Creek, CA

As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!

SueCharleston, WV

Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff.

JimCastleberry, FL

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

< Previous | Next >

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

55,103 satisfied customers

Bosch Certified Master Tech. Over 35 years experience.

Lou P. master tech

Lou P. master tech

Mercedes Technician

3,771 satisfied customers

15 years master certified 100% fix rate and have access to factory radio codes, wiring, and instructions.

Michael Warfield

Michael Warfield

Factory Mercedes-Benz Technician

3,131 satisfied customers

Mercedes-Benz Master Certified technician

Matt

Matt

Engineer

602 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.

< Previous | Next >

Related Mercedes Questions
My Mlwould not shift out of first gear. I suspect that it is
My Ml(###) ###-####would not shift out of first gear. I suspect that it is not problem with the transmission. Can you help?… read more
MB Paul
MB Paul
Mercedes Technician
Vocational, Technical or Trade Scho
3,567 satisfied customers
S550: I am getting a "visit workshop without shifting gears"
I am getting a "visit workshop without shifting gears" message on my screen and I can not get the car out of park...it is a 2007 S550 Mercedes.. I'm blocking traffic anyway to fix this here and now to… read more
Marty
Marty
Mercedes Technician
55,103 satisfied customers
Our 2010 smart car D is flashing while driving, should we
Our 2010 smart car D is flashing while driving, should we have it towed or is it a maintenance issue we should make an appointment to deal with? … read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
Battery, ABS, etc are coming on after changing the battery
Battery, ABS, etc are coming on after changing the battery and aux battery … read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,771 satisfied customers
2002 Mercedes C320 new battery and alternator. Key will not
Second opinion] 2002 Mercedes C320 new battery and alternator. Key will not turn … read more
Marty
Marty
Mercedes Technician
55,103 satisfied customers
I have a 2007 GL450. battery light (auxiliary battery) is
White battery light (auxiliary battery) is displayed I have replaced both batteries have been replaced - gl450 2007 The connections are secure. What else could throw this light? … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
What is the function of the auxiliary battery in the 2014
what is the function of the auxiliary battery in the 2014 E350? ( I just got a malfunction warning )… read more
Matt
Matt
Engineer
Bachelor's Degree
602 satisfied customers
I have a 1999 c230 kompressor, the transmission is going
I have a 1999 c230 kompressor, the transmission is going into limp mode....first gear and reverse...i have to codes p0500 and p0720.. Does the car have a speed sensor in the hub bearing or does it hav… read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,771 satisfied customers
The motor is turning but do not start. The battery was
Yes the battery was checked and there is no corrosion. There is no fire that goes to the sparkplugs … read more
Marty
Marty
Mercedes Technician
55,103 satisfied customers
2007 s550, had transmission. Had transmission fluid changed
Had transmission fluid changed 2 weeks ago at 143000 miles. No problem before then. Now transmission has hard gear change in lower gear and slips , can hear a whirring sound at gear change when it slips. … read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
Will not start dash ligh up new battery. Battery connection
will not start dash ligh up new battery JA: Have you checked the battery, particularly the terminal connections? Are they corroded? Customer: battery connection is good JA: What is the model/year of y… read more
eric remington
eric remington
FORMER SHOP OWNER/TECHNICIAN/INSPECTOR
associates degree
575 satisfied customers
Replace both batteries replace the alternator battery still
Replace both batteries replace the alternator battery still not charging 2008 Mercedes S550 4matic … read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,771 satisfied customers
Replaced both Batteries and Battery warning light and
Replaced both Batteries and Battery warning light and workshop light stays on. … read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,771 satisfied customers
1990 Mercedes Benz 300E Will not start. Turn key, nothing
1990 Mercedes Benz 300E Will not start. Turn key, nothing happens, not even soleinoid engaging. Battery tested good, headlights come on. Replaced starter, but did not fix problem. WHen turn key, minor… read more
Marty
Marty
Mercedes Technician
55,103 satisfied customers
R350: bought used..electronic shift out of park and into any gear
bought used R Class R350, cannot get electronic shift out of park and into any gear ...… read more
Stan
Stan
Technical support engineer
Bachelor\u0027s Degree
106 satisfied customers
Mercedes: Workshop..gear, car wont start..neutral for towing
Mercedes GL320, Message showing "Drive to Workshop without changing gear", car won't start. Is stuck in either d or p as can't move into neutral for towing. Any ideas… read more
Stan
Stan
Technical support engineer
Bachelor\u0027s Degree
106 satisfied customers
1998 Mercedes: first gear..speed sensor #3 n3 y3\611..rpm..temp sensor
In my shop I have a 1998 Mercedes e -320 4 matic, 106,000 miles. The transmission stays in first gear only meaning limp home mode I believe. Failure codes are merecedes numbers 013 speed sensor #3 n3 … read more
MBGuru
MBGuru
Bachelor's Degree
282 satisfied customers
My Car Starts But Then Dies After Sometime
My car starts but it dies a few seconds after starting.… read more
mbfixer
mbfixer
Shop manager
High School or GED
453 satisfied customers
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.

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.

Show MoreShow Less

Ask Your Question

x