Steely

Went to an appointment this morning, when I got back in my car it would not start with a "PARK Parking Brake See operators manual" then it got progressively worse, red alerts about SOS, then asking to place key on the mat, then telling me to press brake pedal (which was locked) etc etc. I called Roadside which was not a good experience, then got disconnected. While on the phone I got an alert saying my car alarm was going off, but it wasn't. After a last ditch effort to start it again it worked and I just got home.

Question: If I take it to the dealer will it have codes stored or will it be a waste of time ?

Steely

Just dropped it off at the Dealer knowing that it will happen again. The service advisor came back later to tell me that there was a major software update waiting for the car that takes 1-4 hours to install.
Wish these car manufacturers wouldn't be so damn guarded and secretive about these updates.

818benz

Glad to hear that the dealership is working on resolving things for you. Would you mind posting your MBUX version after you get it back?

W205C43PFL

I wonder if this is the same type of update the X254 GLC received?

Steely

One was a recall (software update) for Driving Assistance and the other was an update for the rear SAM module. I am hoping this will fix many issues I was having including phantom braking. A lot of my personal setting were reset to default so I will find out more when I get a chance to configure them again.

W205C43PFL

For the phantom braking, although not exactly advised, to reduce the occurances, try setting the Auto braking from Early to Late, or very least Medium.
Here is an example (not your car shown though) : https://cimg6.ibsrv.net/gimg/www.mbw...23044e391.jpeg

Steely

It is already set to late, because it braked on me three times as I was merging into Freeway traffic almost causing a wreck! In the last month, the phantom brakes are applied while I am backing out of my garage into my private driveway with nothing around. I am frankly appalled at how bad Mercedes is at designing this stuff.

W205C43PFL

I see, I did see your other thread mentioning it doing it while backing up.

W205C43PFL

I guess you are aware of the fuel pump recall issued right? Assuming that fixes the starting issue? https://www.autoevolution.com/news/m...d-217340.html#

W205C43PFL

Found the NHTSA document: https://static.nhtsa.gov/odi/rcl/202...3V445-9258.PDF

W205C43PFL

Anyways the original post the link was from: https://mbworld.org/forums/w213-amg/...ml#post8807119

Greg Buechler

There's thread here on my no-start issue, too. In my case it was crushed wires & pins on a connector in the wiring harness that terminates in a control module down in the driver's (LHD cars) footwell. Your problems might not be just software related. In addition to the no-start condition, a full scan of fault codes revealed faults in several modules caused by crosstalk from the damaged harness. If your problems persist, you might want to tell the dealer to check the wiring harnesses.

Glamisfan

I had a starting issue 2 months ago. It started, then died after a few seconds. Did that about 5 times in a row, then started ok, but had a check engine light on. Dealer read the codes and tried to replicate it over 3 days driving it about 20 miles each day, but couldn’t find anything wrong.

Then a week ago the check engine light came on again. I scanned the codes and it said U1120, P0606, P1463. The last code said A/C pressure sensor insufficient pressure change so I thought there was something wrong with the A/C system. But, apparently my OBD scanner was wrong, as the dealer says that the in tank fuel pump is the problem, and there is a back order on a seal with no eta. So it sounds like this is what the recall mentioned above is about.

efr1

Crazy. Different car, but we have a new Acura that does similar. Nothing causes greater doubt in your passengers minds about your driving skills more than when the car jams on the brakes on the freeway on/off ramp. I'm just waiting for that day when an 18 wheeler can't stop as fast as I do and jams right into the back of my car.

W205C43PFL

That must had been dangerous, sorry to hear about it. I highly doubt it but any chance the Acura have a similar fuel pump supplier?

efr1

Don't know, but I can say it had a fuel pump recall a 1 or 2 years ago. I would guess there is a small number of vendors that make a lot of that stuff across brands.It's like these 48 Volt setups you see in MB...several other brands use that, whoever makers it, but for things other than what MB chose to...(softening the auto start feature) I just saw a video yesterday that the same company that makes Genesis GV70 (which is rear wheel drive biased unlike typical Kia/Hyundai which are front wheel drive biased) 4 wheel drive system is the same one that makes BMW's 4 wheel drive setup. I don't recall what the name of the company is but thought that was interesting.

W205C43PFL

Yes that makes sense, for instance the Takata Airbag, was used in many (most?) makes and models.

Proprietary software and hardware also plays a role plus some might just have better features/safety or cheaper(?) that MB opted for.

W205C43PFL

That was interesting indeed, don't know the full scope of manufacturer and supplier relationship and how a product is designed and then created, but (MB in our case) provides the specification and features requested and based on that to make something, I am guessing that company has the equipment to manufacture it. etc.

When it comes to manufacturing I admit there is a lot to learn, a lot of fascinating things too actually.

msh603

i have 2023 mercedes C300 4matic. car failed to start. press start button you just hear click and bunch of error messages on display. tried 5-6 times. just click and error codes. wouldnt start. waited and finally started after 15 min. it is at dealership now as of July 13 2023 and was told they will do software update.
a week ago, while driving from work at 92 deg F half way home car started blowing hot air. AC running , temp low but hot air. took to dealership and they gave car back after a day saying AC system fully functional, no leaks and the did AC system update.

Now, about a month ago i had issue with car startup. it would start and die immediately. I had 100 of codes flashing. took to dealership and was given back a day later
saying nothing found. All codes were clear. There is some serious issue with new cars and especially mine that is causing multiple issues and symptoms.
please share if other have similar startup issues with W206

Bucket323

happened to me a few months back, got all sorts of errors with no engine start. Fixed it by remote starting from phone and it went back to normal but I still had it towed just in case it wanted to die on me while driving. Next day was told it’s a fuse issue and was fixed right away.

W205C43PFL

Sorry to hear that.

Steely

This POS died again, same issues. Flashing a myriad of error messages and just clicks and won't start. Roadside Rescue sent a tow truck but since the wheels are locked and car won't go into neutral they dispatched a specialty tow truck. Waiting on that now.

W205C43PFL

Sorry about that, perhaps a buyback is in order so you don't have to deal with this anymore?

Steely

I am looking into that now, not sure what criteria they use for a buyback. I am now getting 12v battery critically low alerts from the app. Car was just towed to Dealer.
Speaking of the App it is worthless too, now escalated to 2nd tier and they have been requesting different screenshots for over a month now. No resolution yet.

W205C43PFL

The criteria actually depends on your state, different states have different lemon laws.