We finished the Audi A8, but there's a problem with the mild hybrid 48V system. Is it our fault ?

[@mazza7282]

What an absaloute ball ache, on every level ! Good to see some honesty from a garage as well, we all hate it when jobs go badly. Im always learning something new from this channel, but I tell you....I dont want to learn anything about the 48v system 😢 Best use for that space under the boot carpet is a full sized spare.

[@dobromirivanov2454]

There are several possibilities to come out of this situation : 1. Try to charge on the 12 V just with a normal charger with very low amper - for instance 1A or 2A for 24h. Then start the car and check if it is charging. 2. If not, go 19 Gateway, search for: reinitialise 48V system after crash. Or reinitialise the 48V after deenergisaton, or both one after another. I think it was in basic settings.

[@Mechaniax]

I have been trough this. If you do not re energise the 48v system with Odis,it won't work. I have done it at least 3 times. It is not complicated

[@mustaphaessahihi1762]

Does this procedure require online access?

[@Mechaniax]

@@mustaphaessahihi1762 No

[@lordloverockett]

Put a charger on the 12v jump posts, you should then hear a click at the 48v battery. It will then charge the 48v system via the DC/DC converter. If the contactors in the battery don't close then the system can block the starter generator from charging. You can check the output from the starter generator with a multimeter and should be around 50v. Also, if the starter generator is faulty then it will block the 48v battery from closing the contactors. I've seen a number of times where we have to replace both the 48v battery and the starter generator together as one can damage the other. It's not complex in theory but what makes it complex is trying to diagnose what is causing the system to not work.

[@whuzzzup]

To charge from 12V->48V you need VCDS/ODIS to close the connector AND you need a charger that can do >80 A continuous.

[@bskmiki]

Had the same issue, after replacing the alternator I needed to do this "in Battery Regulation in Adaptation [Closing of protection for charge of HV Battery] the new value needs to be ACTIVE." After that the 48V sistem should charge. Good luck

[@racingsnake9425]

Gutted for you, but thanks for being honest and showing the problems you have to face sometimes. The days of mechanics having to be electrical engineers is a sad reflection of where the automotive industry is, and I suspect it will only get worse. Great vid as always though guys.

[@3storiesUp]

You have to appreciate the level of honesty involved in this video.

[@stevenshore674]

Oh man, this is the future of mechanics, electrical nightmare. Bring back the good old days where spanner’s and ratchets were enough. Now you need a tech wizard

[@aaron___6014]

I was just thinking the same thing. A guy could almost rebuild everything just 20 years ago with a basic service manual.

[@Pete1995]

battery module, guided function choose close charging connector. You will hear something clicking. After that the battery starts charging

[@automotiveprogramming]

Not always if its on critically low battery voltage, it wont allow to close it via odis which probably was the case here

[@gt7940]

Pete, I’ve just noticed a clicking sound from the 48v in the booth, don’t know if I’m loosing the plot, is that normal ?

[@Pete1995]

Go in with VCDS/ODIS and see if you can re-initiate 48v battery charging. You need to reset the system after the battery has gone flat. Should be under basic settings in a module, I forget which one.

[@samuesoeilyoriy6581]

is diagnose dan on here . the only man for these type systems .

[@timothyfindlay6253]

Love the honesty, don’t let it get you down, going to be great when you figure it out and get it sorted.

[@99andrianmonk]

Sorry you're experiencing the issues with this unnecessarily complicated system. Your video is extremely helpful and useful for those of us who would like to understand how things operate so thank you for posting this. My neighbor had a similar issue with his 2020 A6 last winter; stopped at a stop light and car shutdown due to auto idle stop and then refused to restart. Had to be towed in.

[@jamespn]

Time to bring in Ivan from State College PA.

[@7747bruno1]

Another honest video..keep up the good work, every day is a school day..👍

[@portzi2]

Yours is the best car repair Utube channel IMHO.

[@josephmay8337]

Good luck there, as a new vw tech i know the feeling of having no experience with a system and being lost on how to diagnose it.

[@AlistairOwensgooglePlus]

Another great video! You guys are the best, very smart and very honest! I feel for you having to carry the can on this. I love Audis to drive, but I don't think they have made a reliable 6 cylinder diesel since 2015 and I would only buy one today if I could afford to buy new with full warranty and sell before the warranty expired. The problem is, with all these issues, by the time I come to sell nobody is there to buy a car like this and the resale value is on the floor.

[@davidmccausland9063]

Respect your honesty and integrity.... hope u crack it soon

[@SinanMehmet-d7l]

Great video, I like how you show problems you have after a repair, running a garage myself it's nice to hear that other's have problems like this, your work is faultless if only all mechanic's worked like you guy's! Thanks for the great video's 👍

[@1boyblu]

This is painful I really feel your frustration, thank you for showing the process

[@COMAutosllc]

Without intention Audi made an immobiliser, can’t steal that car. Well done to you for putting up with it and having the right approach 😊

[@mfordy1056]

Just a word of caution of handling the exposed circuit board in that you could inadvertently damage it by handling without ESD precautions (i.e ESD safe mat, grounding and wrist strap).

[@Mr_Sh1tcoin]

He's wearing rubber soles on a concrete floor. He's not a spotty teen changing CPUs in his carpeted bedroom.

[@mk7gti911]

Had the same problem on a audi a6 c8 3.0 tdi. Generator was dead. Replace generator, code it, charge the 48v system by closing the connection with vcds and putting a 100A charger on the 12v terminals in the engine bay and you’re good to go 👌 these generators fail a lot

[@boerieza]

I think, ultimately, mate, you'll have to use this as school fees to learn about hybrid tech. Like you said, it's the future. You guys have an opportunity here to learn a lot. That's positive.

[@rosspaginton8212]

You normally have to charge the 12v through the 12v jump posts for a good hour or two depending on how flat it is to bring the 48v system above around the 15% mark then it will be able to re energise/ pull the circuit breaker back in and will all start working again as it should do 👍

[@einfelder8262]

He said the 12V battery is charged by the 48V battery through the 48V to 12V step down converter - not the other way around as you suggest (granted he does not have the understanding of the 48V system). But I agree that it would be ridiculous not to have step up charging from an external 12V charger. It would take a while, since using say a 50A 12V charger would only put in about 10A into the 48V battery. The control board should not have to be reset - it should auto reset when it detects the minimum voltage on the battery.

[@rosspaginton8212]

@@einfelder8262 yeah, the ones I have come across this seems to be the procedure, it can take a few tries of asking the 48v system to re-energise using odis, or I would guess vcds also has the capability to re-energise, but that would be my next step to leave the 12v charging or possibly in diag + mode holding the battery voltage at 13.5v or 14.2v for hours to see if it will boost the 48v back into life then try re energise if it doesn’t do it automatically

[@TheUweRoss]

@@einfelder8262 It's a bi-directional DC-DC converter.

[@einfelder8262]

@@TheUweRoss Thanks for the info. There is still a problem with the whole system, though, in my opinion. In this case, the 48V system charged the 12V system continuously (as it should) BUT it kept going until the 48V was dead. Should have stopped before that happened. Then of course the 12V also drained. Badly programmed BMS or DC-DC shutoff settings?

[@DenHvideHund]

you guys are very skilled. Watching your videos is really informative. Thank you

[@sergeyrudnitskiy7579]

Support your honesty anyway and we all need to learn new thing. Those who are learning them in a correct way - doing that expensive, but they are getting a knowledge for sure to avoid making that next time. So do you Guys, respect you for this! If I can make a very small advice - put 12 V battery, I am used to plug it in always, this can prevent draining 48V... maybe... Cheers from Sweden.

[@dan2fast4you21]

Before replacing the generator, check the individual cell voltages of the hybrid pack. In Lithium packs when a cell voltage differs more than a determined value from the rest of the cells it cuts off the pack. As it it is charging the 12V system this issue would be remote, but it’s still worth considering. Maybe the company that flashed the control module will have a option on this. As far as charging goes you can slow charge each cell to the specified voltage of that battery chemistry. I would advise to disconnect all bms wires during this process as charging the cells individually will definitely cause voltage irregularities in the cells. Hobby chargers can be useful as they have the ability to cell balance, but you must check that they are compatible with the exact lithium technology in this 48V system and that it can handle ( 48V / 3.2V ) = 15 cells in series (15S) “3.2V being the nominal voltage of lithium iron phosphate batteries, I suspect this is the battery chemistry used in this system”

[@einfelder8262]

There is no voltage at the generator output.

[@dan2fast4you21]

@@einfelder8262 if the generator was no signal input v then unless it’s a Permanent magnet generator it will not generate any voltage

[@gsxr1000zk4]

So glad I got shut of my 2020 sq5 with this system Moved away from Audi now,stayed in the vag group though with a mk7 golf gtd and gotta say what a fantastic car it is

[@halbous36]

It's not my shop...but it hits me just the same !

[@dominicbarne5218]

I had one in that wouldnt charge and another garage had thrown all the bits at it and was about to buy a battery as well, re latched the battery in basic settings and found the original very cheap part that had failed causing it to not charge and it was like new again, these hybrids can be so much fun 😂

[@raycollington4310]

I really feel for you on this one. The complexity of these cars is ridiculous. All these electronic components would look more at home on a spaceship than a motor vehicle. You'll gain a lot of experience on this one. Anyone who buys these cars with their own money needs their head examined IMO. Hang in there and good luck.

[@miceinoz1181]

God I absolutely love this channel! I am continually reinforced to avoid Audi at all costs. If this 48V system has been out for a few years, surely you are not the first ones to suffer these problems with the charging systems? I do hope you find a solution, because I am sure you will see more of these in the future. I eagerly await the outcome.

[@Mykytys]

I'm lucky with my Audi. It's an A8 D3 V8 4.2 petrol. The best thing about it is that it is not FSI. I have driven it for 265,000 km. it does not consume oil the gearbox works the air suspension works, problems are very simple and you can basically do everything yourself cheap and easy way. the car is 20 years old and runs perfectly. What will happen to an Audi like this in 20 years when it is already broken like a nightmare. No stypid 48 volt systems!

[@neeldub53]

The mild hybrid alternator has component protection which needs to be removed but this is not the case. I agree that a guided function in ODIS should resolve this issue. Contact someone who can remove whatever component protection has been enabled via ODIS. Maybe audi retrofits in Iver.

[@Peter-o]

Greetings from Kyiv, Ukraine

[@itspart]

Great video Fantastic workmanship. Very honest guys... I have the same 48v system on my S4. I just hope I don't get any problems. I have a warranty from a warranty company but I don't hold much hope of this been covered.... keep up the good work guys....

[@victorl7811]

Thanks for sharing that story! Looking forward for the next video with resolution of that issue! Good luck!

[@Nyx_88888]

the AUDI saint strikes again, most patient great Dobermann owner and mature man

[@einfelder8262]

Would happen with other mild hybrids too, not just Audi. Keep your prejudices under control, they don't enhance your credibility.

[@gullible119]

⁠​⁠@@einfelder8262he’s just saying this cause hes a vw technican?

[@einfelder8262]

@@gullible119 Why ask me? How would I know?

[@vee4410]

This channel Is like a and audi horror story series😂. I always wanted to own a B7 Rs4 but after watching this channel for a while I have my doubts. Thank you for another great video👍💯

[@davidoloughlin3180]

hey wow a youtuber who doesn't scream at the audience in excitement as if he's downed his 10th redbull. love the vibe keep it up VAG:)

[@timessix8434]

This was very interesting. Understand your frustration… I am happy I have a 2018 Audi… Oh, also an RS4 video would be great, obviously!

[@jimmerritt2860]

Great video and it’s fab that you film everything good and bad. You’ll get it fixed and all will be well. 😊😊😊

[@themindofthemechanic.2221]

Hey mate, there is a MVB to check on the starter/generator that will tell you if its defective. its a torque value if im not mistaken. I have replaced countless RS6 and RSQ8 starter/generator after the unit fails and the car dies on the customer with a depleted 48V battery. Once the generator develops charge the system functions again. Just tryna help. ill try find that MVB for you if you are keen. Cheers.

[@kleisti7768]

If the 48v battery is charged between 5 and 15% it Will Block charging from the starter generator. You can unlock that with odis and charge it through the 12v jump points. I just replaced a starter generator last week on an a7 and had it charging for 18 houes after, it got to 70% 😂 If the 48v battery is under 5% then odis doesnt allow you to unlock the battery again to charge.

[@whuzzzup]

Hi, what charger did you use? According to the web it needs to deliver at least ~80 Amps continuously. Did yours do that? Because the normal/weak I have, does nothing after using VCDS to close the connector ('active').

[@kleisti7768]

@@whuzzzup i use a 100 amp charger

[@whuzzzup]

@@kleisti7768 Thank you. Have to find one then.

[@whuzzzup]

@@kleisti7768 Oh another question, do you know if you fully charged your 12 V system before using the 100 amps charger (like 12.5 V or so)? Because there is an information from Audi that the state of charge of the 12 V system has to be 40-60%, but people say it should be completely charged.

[@kleisti7768]

@@whuzzzup i just coded the 48v battery to allow it to charge with odis and then put on the 100 amp charger on the 12v battery overnight. What the SoC of the 12v battery was i do not know

[@lrddsk7130]

It opens a contactor in the 48v battery unit to prevent deep discharge. You need to hoook odis and re-engage the contactor, its in there in the bat unit adaptation menus.

[@micho9569]

Hey bro I just wanted to say I love your content and I love how well you do your job, I watch your videos everyday to learn, because I have a b7 Audi s4 and the timing chain is broken now and I am gonna keep watching your videos to hopefully do it myself, that car made me hate myself but I love it so much, and I appreciate your content. ❤

[@MrRudiz13]

Lovely. Much better than bmw 😂 look at the bright side - you'll be one of very few who know how to sort it properly!

[@Johnny16781]

I wish you all the luck in the world on this one, cant wait to find you the problem, and its all about learning l have faith that you will sort it 😁

[@Larionovs]

The garage like yours should have Odis,it would be very usefull in this case

[@OffroadProjects]

Nice Vossen wheels in the background ❤

[@matthewrlawton57]

I work at Skoda and we have few issues with the 48V system with no coms or under voltage lights all on dash. We have a TPI for a software update and that fixes so many issues try contact your someone at Audi to check for you

[@peterarries7879]

Absolute nightmare, mechanics life at it's worst, hope you get sorted, from the comments I'm sure you will 🙏🙏

[@justindaniel5959]

I will stick to my normal ICE vehicle, thank you very much! Great Video! Maybe Scrap yards or eBay has a battery for sale?

[@The_Noticer.]

Saving the polar bears by deleting the spare tyre with usless 48v system. I'm sure you're going to be so happy with that when you slash your tyre on something. As per ohms law though, if the voltage was low, the current goes up. Could've shorted something.

[@sundayoghenekaro8509]

I once ran into a problem like this in an Audi A7, I was able to get it working again with ODIS software by using it to reenergize the battery. When the system is disconnected the 48V system automatically de-energizes the battery and this needs to be enabled for it to start working again.

[@kaydan9906]

Yes you have to do a relearn for the hybrid system after disconnected relay,don't know if vagcom has that feature need odis

[@_Snuffleupagus]

It looks like the 48v generator might have lost it’s magic smoke at 34:50, just after start up, on your previous video. Maybe the generator is now toast😮

[@manxman8008]

great analysis and explanation

[@eugertbolo8636]

Good explaining. God Job.

[@andrewmooreandrewrmoore7615]

Imagine what would happen if the boot or light seals were leaky and that well filled with water!!

[@CohnorCummings]

Just a heads up, I have came across this problem many a times. Do you have an oscilloscope? There is a particulate matter sensor at the rear of the exhaust. When we unplugged that the CAN system came back online and allowed the system to charge, its shorts and drags the CAN system down. I think this is all coincidental for you and the problem existed before. Try this and all the best.

[@6803U4]

I would have thought that all the modules would still communicate on the can bus even if the 48v wasn't active as each one would also have a 12v feed. Looking at your fault log at 12:03 the slower bus signals like lights and sound system are communicating ok but not the high speed bus for engine and transmission etc . I think something has got damaged and shorted out the can bus. If you have an oscilloscope you could check the communications to verify if they are ok and if not unplug modules on the affected bus to see if it helps. Another channel had a faulty brand new power steering pump which shorted out the can bus whenever they connected it. Until you regain communication it is not worth looking into the 48v side issues.

[@xFlowRS]

Got a 3.0 TDI Q5 Sportback from '21. 25.000 kilometers, but this hybrid system gives me creeps. I will sell it in next couple of months and buy something with a trusty 2.0 TDI and low mileage (up to '18)

[@Koorvkungen]

BMW B57

[@boogboog8097]

New audi is not to be owned outside warranty

[@eastcoastrifraf]

This sums up Audi cars for anyone who has not owned one yet 😊

[@FuryStudios]

You mean every single manufacturer with hybrids nowdays?

[@mudddge]

@@FuryStudiosAudi's 48v mild hybrid system is not like any other ones

[@andrewparrington265]

Salvage rebuilds had an issue with a car that they had, and they used a garage which was able to sort it out for them,

[@garagederoo5225]

You need to enable the 48 v system with odis!

[@ahsan3369]

You need Odis to sort this out especially the 48V system. If you’ve got a decent passthru cable I can help remotely.

[@nikolaosezikis7622]

First as you say you don’t have basic skills tools like a 48v charger. So get that one. Second there is an option to re energize charging through the diagnostic but the battery has to be charged (the 48v charger comes handy) . Third the wisest thing would be the car to go to the dealer because like this you are wasting both the money and time of yours AND the owner who probably needs to be awarded the medal of patience..not because you are not good at your job you are excellent but because you don’t take quick decisions. Don’t forget that in 10 years the car mechanics will start being replaced with electric engineers :)

[@Optimus79Prime]

Hi Which engine do You recomend for Audi A8 (2019 - 2021)? Diesel or Petrol V6?

[@Pete1995]

Had the same fault with a Q7 when the 12v battery went flat and the 48v battery drained itself.

[@europerfo7168]

it happen to me one time with a q7 the 48 volt stop working after replacing the engine harnest due to a mouse nest . tcm . abs . ecu . headlight range wont comunicate . i unplug each module and replug one by one and check comunication then if the comunication is made with the plugged module i check the live data if something wrong at the same time i check the live data of the generator with a lab scope . when i plug the ecu the data of the generator start acting funny and when i plug the ecu all the other module start to lost comunacation but like you the car start and run but wont charge . i have a lunch throttle 3 and have acces to audi server like odis . i check each configuration of each module of the entire car and after 3 module update and 1 svm for the battery converter module it work like before . im glad if it can help you

[@AnthonyGriz]

What a crazy headache to have - no wonder it's getting harder to find mechanics these days. If I were thinking in my old school way, I would remove the drive belt from the motor/generator, and hook up another motor with a short belt underneath the car, or even use a drill with a socket fitting, and drive the generator until such time as the 48v battery and 12v batteries are both fully charged. Of course, if no charging occurs, or very little charging, then it's possible the motor/generator is toast. After that, either reconnect the main drive belt and try starting the engine like normal if it did charge up properly, or it might be time to order in a new motor/generator. This is the reason I really wan't to build a mechanical compressed air powered motor, and replace all these hybrid monsters of technology...

[@highlandmalt6368]

I have a 2020 SQ7 and a 2002 S8. The S8 is, in almost every respect superior.

[@kevinc7632]

When he set the unit down in the trunk i saw a nuclear explosion in my mind 😂

[@billturner6564]

I wonder how water profe the battery and control module is 😅 It needs 2 be where it is in the bottom of the spare wheel well 😅 That spot is always full of water on any car

[@KevinThomas-kxtphotography]

Every day a school day 👍

[@donalheaiy2087]

When you are doing a major repair on a 48volt system the first thing to do is disconect the system on the vag computer.then carry out repaithen reconnect the system otherwise big problems.the car will have to go to a main dealer

[@utensil999]

Ah man I feel for you guys

[@metcalfeovls11]

open the battery and charge directly bypassing the BMS , if the BMS see's no voltage it wont charge 'it needs voltage in the battery for the BMS to start charging again and use at least a 52v charger.

[@VAGTechnic]

Did

[@emilsgargurnis]

Buy a vas 6154a and Youre secured with solution finding. Can help with this btw.

[@garymurphy5133]

I fly RC heli`s , any good model charger will charge that lipo battery. you will need sort the correct connectors thats all.

[@Murphman74]

Thinking I’m gonna stick with my supercharger for a while longer after seeing this.

[@johncowie3092]

What the hell is the purpose of mild hybrid anyway what problem does it solve

[@dmarkovina]

The fix: kzbin.info6KeMHQFf5Ss?si=XxB4FzgsNYeb21Ib

[@johncowie3092]

Excellent design expensive complicated electronics located in spare wheel well / paddling pool what could possibly go wrong

[@vlmxs]

Did you solve the issue in the end? We need an update :)

[@VAGTechnic]

Working on it

[@softytop1000]

good luck good vid

[@deepspacenine4313]

it is possible to disconnect the 48v battery and just run the car with the 12V system? I would like to buy a 50 TDI but do not want to mess around with this complicated stuff, just want to drive a v6 TDI without worries. BTW: what is the benefit of the 48V MHEV besides costs and headaches for the owner?

[@VAGTechnic]

No

[@deepspacenine4313]

@@VAGTechnic Do you think newer builds are more reliable (2024)? I am looking to run a new 50 TDi for 8 years or longer

[@plokijij7856]

Damn those polar bears!

[@24bellers20]

I know this is a bit late for you, but whenever I don’t use a hybrid, it goes on the charger.

[@paulhutchins6019]

What another nightmare of a system from Audi 🙁

[@paulhutchins6019]

Is it! I've just read that it can generate 5 -15kw when operating correctly, that's a phenomenal amount of power 😮

[@Martiizzer]

Holy shit the cars done + 300k miles ?

[@robertturner6797]

What a strange system

[@johncowie3092]

I quite fancied a cheap a8 not now though

[@richardmurray6651]

What an utter pain in the ****!

[@Mark-gf7yw]

Looks like ‘Vorsprung Durch Technik’, is not what it used to be 🤔

[@ccbanger1414]

Getting in contact, he’s on KZbin the intelligent Auto channel he is excellent very good on a scoping and hybrid systems

[@doctor_who1]

WOW

[@julenemalcolm5706]

This seem to be a common problem once the 48v battery becomes dead

[@chrispy104k]

What an absolute joke. Surely Audi can come up with a start stop system that relies only on a 12v battery such as that used by Subaru. This is engineering gone friggen mad.