2015 Mercedes C300- Auxiliary Battery Malfunction with DTC B21DC01

Автокөліктер мен көлік құралдары

Check out my amazon affiliate link to help the channel:
www.amazon.com/shop/voltagedropdiagnostics
Just a short little video that I hope helps someone when diagnosing one of these auxiliary battery malfunction lights. I know this is a fairly common problem, but at least for me, a toyota dealer tech, getting service information was the hardest part.
I hope you all enjoy!
Link to the scan tool used in this video:
amzn.to/2NgalaJ
Information found from Autologic:
uk.autologic.com/news/support...
CTI training:
ctionline.com/
Also, if you want to contact me privately. My email is: yotaguruyt@gmail.com
The views and opinions expressed are in these videos are my own, and have not been reviewed or approved by my employer, and do not necessarily represent the views and opinions on my employer.

Пікірлер: 90

  • @VoltageDropDiagnostics
    @VoltageDropDiagnostics3 жыл бұрын

    Check out my amazon affiliate link to help the channel: www.amazon.com/shop/voltagedropdiagnostics

  • @djosbun
    @djosbun4 жыл бұрын

    PJ has unveiled the next superstar diagnistician.........as long as he listens to his master teacher and absorbs the brilliance!

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    4 жыл бұрын

    He is going to be good. Real good.

  • @nathanmurphy2161
    @nathanmurphy21613 жыл бұрын

    This video just saved us a ton of diag time and more importantly helped out a good customer of ours!

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    3 жыл бұрын

    That’s what I made the video for! I’m so happy to hear that!

  • @caliautotech21
    @caliautotech214 жыл бұрын

    Nice video as always bro! Nice to have people like you out there to post this type of info to help others!

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    4 жыл бұрын

    Thanks buddy!

  • @SuperMarioDiagnostics
    @SuperMarioDiagnostics4 жыл бұрын

    Great video man! Thanks for the shout out!

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    4 жыл бұрын

    You deserved it man! I couldn't even find the capacitor location in SI so I jumped on youtube and who had the first video that I seen for this? My man Mario hahaa

  • @billyyoder8171
    @billyyoder81714 жыл бұрын

    Thank you Patrick. Good job. Have a blessed and safe week.

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    4 жыл бұрын

    Thanks for watching Billy! I hope you have a blessed week as well!

  • @NewLevelAuto
    @NewLevelAuto4 жыл бұрын

    You must have a great support team out there somewhere . Great job brother 👍✌

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    4 жыл бұрын

    Id put my support team against anybody else's! That's for sure!

  • @stevenkietzke5582
    @stevenkietzke55824 жыл бұрын

    Good to be able to reach out to other techs. Good information thanks

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    4 жыл бұрын

    Yes! Having a solid network is key sometimes.

  • @kurtkennedy5370
    @kurtkennedy53704 жыл бұрын

    You are the man! I should have looked this up for you the other day. Nice find and fix!

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    4 жыл бұрын

    No worries man. I was fairly certain about the capacitor being bad. I just hate making calls without being 100% sure.

  • @pjgammarano571
    @pjgammarano5713 жыл бұрын

    Hey Pat (and apprentice) - Another thanks to you (both) for this research & deciphering on this auxl battery (Mercedes' misnomer ?) !! People are gonna be checking out this hard-to-find info & demo for many years ! P J G

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    3 жыл бұрын

    Thanks! Im glad that it has helped!

  • @kennedysgarage3281
    @kennedysgarage32814 жыл бұрын

    My own E220 has this exact message on instrument cluster intermittently. Which I have been meaning to take a look at ,it may not be the same issue but it is great to see some good test info. Love the videos keep them coming 👍

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    4 жыл бұрын

    Those have real auxiliary batteries, dont they?

  • @briankotze57
    @briankotze574 жыл бұрын

    Info is appreciated. Keep them coming

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    4 жыл бұрын

    Thanks Brian! I have a good one that I am editing now!

  • @TheDisgruntledMechanic
    @TheDisgruntledMechanic4 жыл бұрын

    Thanks for the info! and yes sometimes the information you need can be scarce.

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    4 жыл бұрын

    Yeah. I was surprised with how little info was on all data for the 2015 model year, but the 2014 model year had a ton of info.

  • @arlokkkk
    @arlokkkk3 жыл бұрын

    Thanks for this video man! I just a message on my c400 saying " auxiliary battery malfunction". So you have the part number that I have to buy by any chance? Thanks

  • @isalmankhan1
    @isalmankhan14 жыл бұрын

    Thanks for sharing Bro👍 This is a difficult fault to find

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    4 жыл бұрын

    Thanks for watching!

  • @RedneckProductions39
    @RedneckProductions394 жыл бұрын

    You got me! (I’m the apprentice)

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    4 жыл бұрын

    It wasn't the first time, and it won't be the last! hahaha

  • @mazenkanso
    @mazenkanso3 жыл бұрын

    Thanks for the video, when I got auxillary battery error, I replaced it and the error was gone but the start/stop stopped working ! again I bought 2 more parts but the eco on the dashboard does not show up. I reset the car using Launch scanner, again it did not resolve the problem.Please can you help

  • @JoelAutomotiveInaction
    @JoelAutomotiveInaction4 жыл бұрын

    great diagnostic , 💪🏻💪🏻

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    4 жыл бұрын

    Thanks Joel!

  • @angelamartinez5691
    @angelamartinez569111 ай бұрын

    So glad to know this! Thank you.

  • @funtimeswithanaia912
    @funtimeswithanaia9123 жыл бұрын

    Thanks much, helped a lot!

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    3 жыл бұрын

    Glad it helped!

  • @silentkilla5339
    @silentkilla53392 жыл бұрын

    I saw that on my screen in my Benz c300 4 matic, is this the reason why the car won’t start?

  • @loganandmarleyhall4172
    @loganandmarleyhall417211 ай бұрын

    can this affect the power steering ?

  • @vm6971
    @vm69713 жыл бұрын

    Great job on a content for Mercedes! Like!

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    3 жыл бұрын

    Thanks!

  • @elitegalaxy4042
    @elitegalaxy40422 жыл бұрын

    How can I get that part I got the same model !!!

  • @angsdoordecorandmore9132
    @angsdoordecorandmore91324 жыл бұрын

    🖤🖤🖤

  • @alexandergrubnik4484
    @alexandergrubnik44843 жыл бұрын

    Good job Sanks for hint

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    3 жыл бұрын

    Thanks for watching!

  • @x7royalhbb943
    @x7royalhbb9433 жыл бұрын

    thanks for sharing

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    3 жыл бұрын

    Thanks for watching!

  • @wyattoneable
    @wyattoneable4 жыл бұрын

    It seems those Germans don't like giving up information. I have first hand experience with Germans, I'm married to one. (ha ha) Great tip.

  • @richardcranium5839

    @richardcranium5839

    4 жыл бұрын

    not just the germans. last place i worked sold japanese. was told many times not to give out info(from corporate) my reply was bite me

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    4 жыл бұрын

    This had me dying from laughter!

  • @newtongsm

    @newtongsm

    3 жыл бұрын

    I went to a exhibition there was a.zf stall.ask them why new 9g tronic gear box use plastic oil pan answer was it is classified

  • @zarshedmedia
    @zarshedmedia4 жыл бұрын

    Im getting same problem should i buy new or i can still fix it

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    4 жыл бұрын

    buy new. Sorry that I am just getting to these comments.

  • @prospexican
    @prospexican2 жыл бұрын

    great, my customers car has both batteries acting, i did recommend him to replace both batteries and clear the codes and go from there, same code so. i told him 2 days ago that some false codes might come on w low bad batteries.

  • @flatratemaster
    @flatratemaster4 жыл бұрын

    All info on Euro cars is in the factory scan tools🤬

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    4 жыл бұрын

    Yeah, now that I have been using ista for the new Supra, I am learning this. It just sucks when you don't have those scan tools. I don't see a toyota dealer buying an xentry anytime soon haha

  • @user-om2tb2os2g
    @user-om2tb2os2g4 жыл бұрын

    After changing the battery, does the car need programming?

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    4 жыл бұрын

    Nope. You should be good to go.

  • @khalidk12

    @khalidk12

    3 жыл бұрын

    No need

  • @kingsleyjustine8904
    @kingsleyjustine89043 жыл бұрын

    If I make the capacitor swap with a new one, do I need to do something to clear the error message? Great video by the way.

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    3 жыл бұрын

    Kingsley Justine nope. For me the light went out on its own.

  • @kingsleyjustine8904

    @kingsleyjustine8904

    3 жыл бұрын

    @@VoltageDropDiagnostics Thx for the quick reply.

  • @alexsteven384
    @alexsteven3843 жыл бұрын

    Mines only fails when the temperature is cold... 2 miles later and its OK...? In the summer no problem...

  • @MrNod56
    @MrNod563 жыл бұрын

    What is the location of auxiliary battery in Mercedes c250 year 2015? Thank you

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    3 жыл бұрын

    Should be on the passenger side, behind the carpeting

  • @MrNod56

    @MrNod56

    3 жыл бұрын

    @@VoltageDropDiagnostics noop, not there 🤷🏻‍♂️

  • @dominikzurawski5429
    @dominikzurawski54293 жыл бұрын

    Hey, Thx for video, where i can by this module ?

  • @dominikzurawski5429

    @dominikzurawski5429

    3 жыл бұрын

    I have A 205 044 00 73

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    3 жыл бұрын

    @@dominikzurawski5429 i got it directly from the dealer

  • @dominikzurawski5429

    @dominikzurawski5429

    3 жыл бұрын

    @@VoltageDropDiagnostics Thx for info, i have checked fuses and one of them is faulty. I replace that one.

  • @dominikzurawski5429

    @dominikzurawski5429

    3 жыл бұрын

    I meant capacitor not fuse

  • @kevinbarry71
    @kevinbarry714 жыл бұрын

    Couldn't find any information because; Mercedes

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    4 жыл бұрын

    exactly! haha

  • @moebassidji8306
    @moebassidji83063 жыл бұрын

    great info. thanks.

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    3 жыл бұрын

    Thanks!

  • @promiseofwar
    @promiseofwar3 жыл бұрын

    What’s the cost to fix that?

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    3 жыл бұрын

    I honestly dont remember.

  • @PaulyD0859
    @PaulyD08594 жыл бұрын

    The lack of service info on some makes is maddening! 🤬

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    4 жыл бұрын

    Yeah. This one was frustrating because I knew that the capacitor was a common failure part. It was an easy diag. But gathering up the information to be 100% sure of the failure was a pain in the rear.

  • @PaulyD0859

    @PaulyD0859

    4 жыл бұрын

    I wonder sometimes, if the manufacturers believe that will force people back to their dealers. I think, all it really does is piss off people and make them hate those car lines. There are certain car lines I tell people to avoid like the plague and Mercedes are near the top of my list, just for that reason.

  • @jeffmajor1816
    @jeffmajor18164 жыл бұрын

    Part #?

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    4 жыл бұрын

    A 205 905 34 14

  • @skillz1855
    @skillz18553 жыл бұрын

    Why didn't you simply use a digital volt meter

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    3 жыл бұрын

    Only because i almost never use one. You never really know how a circuit is meant to operate. Sometimes such simple circuits are being pulsed on and off and while using a voltmeter, you can get a reading that doesn’t make sense not knowing that the circuit is being turned on and off

  • @robertmedina6875
    @robertmedina68754 жыл бұрын

    Why people buy Mercedes money pits lol

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    4 жыл бұрын

    Thats a good question! 30,000 miles on this one!

  • @ovwok
    @ovwok4 жыл бұрын

    First

  • @gbmechanicbellew6124

    @gbmechanicbellew6124

    4 жыл бұрын

    Great video. I really like the Diagun 1v . When I checked the link to buy it, it says unavailable on Amazon. Can this not be got anymore?

  • @billrimmer5596

    @billrimmer5596

    4 жыл бұрын

    This Mark is high tec

  • @VoltageDropDiagnostics

    @VoltageDropDiagnostics

    4 жыл бұрын

    I just heard that theyre on backorder for about another month! Sorry!

  • @michaelyouens6133
    @michaelyouens61332 жыл бұрын

    Iv had my 2014 220 c class for a year and it's the worst car iv ever owned its nearly a weekly thing that something goes wrong with this car everything from ac compressor to main drive belt snapping the list gose on this is the latest problem so once this is fixed it's going and I will stick to bmw !!!!

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