Mercedes

Have Mercedes Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Mercedes

SL 550: Have a 2009 Mercedes SL550. When driving in S or C

Customer Question
Have a 2009 Mercedes SL550...
Have a 2009 Mercedes SL550. When driving in S or C mode in Drive the car will automatically kick down into lower gears even though the car is in drive. If at hiway speeds it can kick down to 3rd or 4th, if in town it can kick down to 2nd or first.
You can clear the issue by going into neutral and popping it back into drive. Any ideas?
Submitted: 1 year ago.Category: Mercedes
Show More
Show Less
Ask Your Own Mercedes Question
Answered in 8 hours by:
4/12/2016
Mercedes Mechanic: Pete, Mercedes Mechanic replied 1 year ago
Pete
Pete, Mercedes Mechanic
Category: Mercedes
Satisfied Customers: 30,481
Experience: Over 15 years experience as a Mercedes dealer technician
Verified
My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here. If you have no check engine light on with this issue here this can be due to a fault with the shift adaptations being off.What needs to be done from here is to have a scan tool/computer or dealers SDS machine plugged into your model to relearn the shift adaptations.Once this is done this should correct the shift points as well as the down shift points correcting this here.Most shops or a dealer will usually charge about an hours labor to relearn the shift adaptations to correct this fault here.This does need done as well as having the fault codes checked with the same machine plugged into your model to locate any codes set that may help diagnose and shift issues but I suspect the shift adaptations need relearned to correct this fault here. If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service.You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.Thanks Pete
Ask Your Own Mercedes Question
Customer reply replied 1 year ago
Sorry for the delay getting back to you.I took it into Kennewick Mercedes and they did hook it up to the computer to reset the shift adaptions. They told me the car is not trowing any codes at all. No more then a mile from the dealership it did it again.So while the car is in either COMFORT or SPORT this can happen. I cannot detect a common them or condition that makes it downshift from DRIVE, it just sometimes does it.Tonight a was cruising at about 40mph and the car downshifted to 3rd gear. The instrument cluster still showed the car in SPORT mode but instead of seeing "D" it showed "3". As third gear slowed the car way down it then down shift to 2nd before I kicked it into NEUTRAL and back into DRIVE, this clears the symptom.So, not check engine light, no codes, and reset the adaptive transmission. Any ideas on what to do from here are appreciated.Thanks Pete
Ask Pete Your Own Question
Pete
Pete
Pete, Mercedes Mechanic
Category: Mercedes
Satisfied Customers: 30,481
30,481 Satisfied Customers
Experience: Over 15 years experience as a Mercedes dealer technician

Pete 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

29,009 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
I have a 1995 Mercedes s320 that had engine and transmission
I have a 1995 Mercedes s320 that had engine and transmission replaced. It starts and restarts fine for a period. Then when turned off it can take several hours before it restart. … read more
Marty
Marty
Mercedes Technician
Associate Degree
29,009 satisfied customers
When my car turns on and off, the transmission slips. Then
When my car turns on and off, the transmission slips. Then return to normal.If you turn the power on again, the transmission slips again.So I replaced the atf, replaced the 8 solenoid valvesStill the … read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,771 satisfied customers
I just replaced the Transmission conductor plate & that
I just replaced the Transmission conductor plate & that seems to be an improvement, But each things seems to sponn the nextI now have two codes P0400 & P0123 and no other check engine lights at the mo… read more
tim37857
tim37857
Mechanic
High School or GED
71 satisfied customers
Marty. E250 cgi year 2012. Transmission fault 0717. 3 months
hi Marty JA: What is the model/year of your Mercedes? Customer: e250 cgi year 2012 JA: Are you fixing your E250 yourself? What have you tried so far? Customer: yes transmission fault 0717 JA: When was… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,009 satisfied customers
Changed radiator,now transmission acting up. Never,but it
It stop pulling,so I added a quart of transmission fluid… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,009 satisfied customers
Automatic transmission 722.699 problem I have changed the
Automatic transmission 722.699 problemI have changed the torque converter and TCC solenoid. The partnumbers is correct. There were “no problems” regarding shifting before I did the work.My car car sta… read more
Eurocar Inc
Eurocar Inc
Master Audi/VW Tech
Associate Degree
1,773 satisfied customers
Transmission say E Will not move when in drive. Just bought
transmission say E Will not move when in drive JA: When was your transmission fluid last checked? Customer: just bought the car so not sure JA: What is the model/year of your Mercedes? Customer: 2016 … read more
Pete
Pete
Mercedes Mechanic
30,481 satisfied customers
Stepped on gas pedal hard yesterday and transmission slipped
Stepped on gas pedal hard yesterday and transmission slipped revved and went back into gear. Lost race mode, shifting pedals not working. Car moves in forward and reverse, AAA car home instead of burn… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,009 satisfied customers
Just want to know. my mechanic said transmission oil change
just want to know. my mechanic said transmission oil change for my e350 class can be up to 90000 miles before you change transmission oil and filter. Mercedes benz recommends at 39,000 and again at 60… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,009 satisfied customers
MB C300, 2008, RWD, AT transmission, 4 doors sport, it has
MB C300, 2008, RWD, AT transmission, 4 doors sport, it has 260k miles. I described the symptoms below to the experts, they all pointed to bad Trans TC or internal TC failures. I need help to check to … read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,771 satisfied customers
My 99 Mercedes SLK 230 has dirty transmission fluid after
My 99 Mercedes SLK 230 has dirty transmission fluid after about 50000 miles of driving since I bought it. It was clean when I got it. I notice occasionally it gets stuck in first gear I have to shut t… read more
Gunvir Singh
Gunvir Singh
1,817 satisfied customers
Transmission problems. Won't shift out of first and wont
Transmission problems. Won't shift out of first and wont move in reverse. Happened twice and I am scared that it will leave me stranded. I am retired and bought a Mercedes for its reliability It shoul… read more
Eurocar Inc
Eurocar Inc
Master Audi/VW Tech
Associate Degree
1,773 satisfied customers
My 2000 c230k calls for a 722.6.5 transmission. i found a
my 2000 c230k calls for a 722.6.5 transmission. i found a 722.6.33 which has a different bell housing so i put the old bell housing on the new one just wanted to know if thats going to work. … read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
I need to know the type of transmission and fluid type to be
I need to know the type of transmission and fluid type to be used on a 2002 Mercedes-benz S500. Also, is this vehicle RWD? Where can I purchase the transmission dipstick for checking the fluid level? … read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
My 2008 Mercedes ML350 transmission stuck on Park position
my 2008 Mercedes ML350 transmission stuck on Park position and I can not change it to drive positions there is an red error like vehicle in not on park … read more
Gunvir Singh
Gunvir Singh
1,817 satisfied customers
Feels as though the transmission is slipping on a 2008
Feels as though the transmission is slipping on a 2008 R320cdi....... happens when the trans comes up to temp and you get some jerking but mostly just engine speed that doesn't match wheel speed … read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,771 satisfied customers
Instrument cluster do not work correctly ,transmission high
instrument cluster do not work correctly ,transmission high rpm before shifting when cluster fails … read more
Pete
Pete
Mercedes Mechanic
30,481 satisfied customers
The transmission is in limp mode. Transmission fluid is
yes my airmatic system I put new struts in now if I let the car sit over night the air leaks… read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
3,771 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