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.

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.

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

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

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.

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

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.

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

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.

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

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

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.

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.

Yours is the best car repair Utube channel IMHO.

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

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.

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).

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.

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

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

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

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

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. ❤

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.

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 👍

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 👍

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

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 😁

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

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....

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

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 😊

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

great analysis and explanation

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.

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👍💯

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 😂

Nice Vossen wheels in the background ❤

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.

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:)

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.

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”

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.

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.

Greetings from Kyiv, Ukraine

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

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.

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

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

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

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

good luck good vid

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😮

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

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

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.

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

Ah man I feel for you guys

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.

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)

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.

You need to enable the 48 v system with odis!

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,

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

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

Every day a school day 👍

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...

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

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.

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

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

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

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

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

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 :)

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

Damn those polar bears!

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

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

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

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

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.

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

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

I quite fancied a cheap a8 not now though

WOW

What a strange system

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

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

What an utter pain in the ****!

🙌🙌👍😊👌🍀

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

change tre nox sensor!!

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

Holy shit the cars done + 300k miles ?

The fix: kzfaq.info6KeMHQFf5Ss?si=XxB4FzgsNYeb21Ib

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

How do you say bastard in Slovakian?

i dropped an rs7 to audi with 48v alt fail, audi tell me they extended warranty it to 7 years in the uk

the usual pain in the ass is getting bigger thanks to innovations