Electric System Malfunction
04-02-2023, 01:46 AM
#811
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It's an interesting quote that you surfaced. I agree with you that it's most likely not the definition that we think about which is why the EA839 torque and HP figures do not take into account the boost provided by the BSG. This is unlike ISG applications, specifically, IIRC. When I think about plug in hybrids as an example, it very clearly will indicate ICE and e"boost" figures. So basically the SSP isn't even entirely consistent throughout which is exactly like all of the other SSPs provided by Audi since the dawn of mankind 
From what I see on OBD11, the boost is actually very very consistent, and generally speaking "max" boost occurs in between gear changes and specifically at low RPM. The other time I see it at max boost for reasons I cannot explain is on the highway at coast....(yeah, I don't get it.)
Situation #1 makes sense. Car needs to get going, BSG gives it a boost. Switch from Gear 1-> Gear 2, BSG gives it a boost, then the ICE engine takes over.
In any event, the BSG torque (duration and amount) is so miniscule that it's irrelevant. Don't get me wrong, I facking hate all of this 48V garbage. It's all just a waste of space, money, and time.
From what I see on OBD11, the boost is actually very very consistent, and generally speaking "max" boost occurs in between gear changes and specifically at low RPM. The other time I see it at max boost for reasons I cannot explain is on the highway at coast....(yeah, I don't get it.)
Situation #1 makes sense. Car needs to get going, BSG gives it a boost. Switch from Gear 1-> Gear 2, BSG gives it a boost, then the ICE engine takes over.
In any event, the BSG torque (duration and amount) is so miniscule that it's irrelevant. Don't get me wrong, I facking hate all of this 48V garbage. It's all just a waste of space, money, and time.
edit:
@angrypengu I was thinking about this more. Is there something that tells us more exactly what happens during these use cases? (other than the marketing videos that show the cameras, and other sensors used) There has got to be something more detailed out there - just not sure if we'd have access to it. I am thinking of 3 things. ICE stop process, ICE start process and what is happening during the time between the stop and start. I would be curious to know what is going on. I assume there is a balance of clutch and rpm adjustment during both the stop and start. I wonder if the start or the stop is harder on the BSG? We know the transistors end up damaged, so I searched "what causes a transistor to fail" and saw this:
Do you know if there is a way to monitor the BSG temperature? I assume the voltage within the circuit where the transistors reside is not accessible to us. Circling back to if someone was able to take a closer look at this board - I wonder if they'd be able to comment on the quality of the individual components for the application? Is this electronics board within the BSG well designed and built with better components, or, is it somewhat sub part? Too me if you the see transistors dying, the same ones, across many units, something is consistently happening to cause that. It seems like if it was something somewhat minor that audi/vitesco/continental could do to the board to fix it, they'd have done it by now. This makes me thing it might be a more systemic design problem where the BSG just gets too hot or can't regulate the power for the onboard electronics like it should.
Last edited by ThomasWShea; 04-03-2023 at 07:15 AM.
04-05-2023, 07:58 PM
#812
AudiWorld Junior Member
….got my 2019 Q8 back with the repair fully completed. They detailed the car for my inconvenience (did a nice job too!).
No charge for repair and they reimbursed me $60/day for the rental I had to get due to no loaners.
Drove the car 250 miles today, seems fine.
Car was in the shop exactly two months.
No charge for repair and they reimbursed me $60/day for the rental I had to get due to no loaners.
Drove the car 250 miles today, seems fine.
Car was in the shop exactly two months.
04-05-2023, 09:04 PM
#813
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yeah, the credit is just not a good deal. down here in the states it’s 5g. you would take an absolute bath. only way it makes sense if if you were planning to trade in and take a bath anyway. even then i would press for a hell of a lot more that the credit. plus, last i checked, are there even many Q8 cars around to buy? answer is no if ur at all picking about color combo and packages.
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campingmanbc (04-07-2023)
04-05-2023, 11:05 PM
#814
Safety tips?
For those who haven’t experienced this stay safe..
are there any prior warning signs that this malfunction is about to happen?
If you are on highway/busy road and see this issue, how long does the car keep going? Do you try to drive to dealership or immediately pull over to a safe spot away from traffic?
what are out of pocket costs if out of warranty? How is the parts availability looking like?
are there any prior warning signs that this malfunction is about to happen?
If you are on highway/busy road and see this issue, how long does the car keep going? Do you try to drive to dealership or immediately pull over to a safe spot away from traffic?
what are out of pocket costs if out of warranty? How is the parts availability looking like?
04-06-2023, 01:56 AM
#817
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For those who haven’t experienced this stay safe..
are there any prior warning signs that this malfunction is about to happen?
If you are on highway/busy road and see this issue, how long does the car keep going? Do you try to drive to dealership or immediately pull over to a safe spot away from traffic?
what are out of pocket costs if out of warranty? How is the parts availability looking like?
are there any prior warning signs that this malfunction is about to happen?
If you are on highway/busy road and see this issue, how long does the car keep going? Do you try to drive to dealership or immediately pull over to a safe spot away from traffic?
what are out of pocket costs if out of warranty? How is the parts availability looking like?
04-06-2023, 08:03 AM
#818
Hi Shea, I read that this is also an issue with 2019 A6. Is that not the case? I was looking to go a little over my budget to get the used 2019 A6 but after looking through this I might just settle for the 2018 A6 as its cheaper and maybe more reliable?
04-06-2023, 08:41 AM
#820
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i haven’t followed the issue on the A6. If it has the BSG, you can always car by car see if it has been fixed already. audi should have records. As far and a percentage, I don’t know. I would say assume it can happen if you get a car w the BSG - it is fairly wide spread. If the 2018 has no bsg then this issue is off the table.