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Stop start feature

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Old 05-22-2014, 09:32 AM   #1
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Default Stop start feature

My A6 TDI is about 5 weeks old with 1000 miles. Since day one the “stop/start” feature has only worked intermittently. I have read the manual and understand that the "stop/start" feature does not work under all conditions. I am talking about it not working during times when it should- – normal residential street driving after the car has warmed up. For instance, today I had the car out on a 12 mile trip, 6 miles each way; residential area; weather in the high 70's; a/c on for the entire trip. I counted 13 FULL stops at red lights and stop signs. Not once did the "stop/start" feature work. (and yes, the feature is ON). Since I purchased the car, I have noticed that the "stop/start" feature works about 50% of the time. Today was a fat ZERO.

Now, I know the problem cannot be all me. I had the car in for service earlier this week (for this complaint and several minor issues) and was given an A6 3.0 as my loaner car. I counted 6 full red light and stop sign full stops and each time the stop start feature worked.

Audi service found nothing wrong with the "stop/start" feature during the service.

Any ideas???
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Old 05-22-2014, 09:41 AM   #2
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Was the A/C Temp set to "LO" versus a specific degree. I have experienced that when it is set this cold, the stop/start feature does not engage.
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Old 05-22-2014, 10:04 AM   #3
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Assuming the other criteria is met, i.e. a/c, engine temp, etc., Stop/Start will only engage if the brake pedal is firmly depressed. It will not engage if you come to a gradual stop w/o fully depressing the pedal afterward.
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Old 05-22-2014, 10:05 AM   #4
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There are a number of parameters which are considered in the operation of start/stop function, and not limited to HVAC (call for heat, or cooling), charge level of the battery, ambient temperature, and temperature of the vehicle (oil/coolant). On my Q5, I enabled the battery level meter and was surprised to see that the charge level varied between 70 and 60% of full charge. Stop/start never worked when the charge was below 80%. The alternator of this car has some "smarts" and it is not constantly charging the battery, as far as I can tell.
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Old 05-22-2014, 10:06 AM   #5
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Quote:
Originally Posted by snagitseven View Post
Assuming the other criteria is met, i.e. a/c, engine temp, etc., Stop/Start will only engage if the brake pedal is firmly depressed. It will not engage if you come to a gradual stop w/o fully depressing the pedal afterward.
And this.
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Old 05-22-2014, 10:18 AM   #6
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Quote:
Originally Posted by snagitseven View Post
Assuming the other criteria is met, i.e. a/c, engine temp, etc., Stop/Start will only engage if the brake pedal is firmly depressed. It will not engage if you come to a gradual stop w/o fully depressing the pedal afterward.
Snag, completely off topic, but did you see the new A7 facelift?

Just being reported on today. They say it will be available late this summer in the US. And it is being reported as HAVING the LTE.

I was wondering if you thought there was any chance that was, in fact, true. And if it is, whether or not we may see that on our MY15's.
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Old 05-22-2014, 12:39 PM   #7
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Snag, completely off topic, but did you see the new A7 facelift?

Just being reported on today. They say it will be available late this summer in the US. And it is being reported as HAVING the LTE.

I was wondering if you thought there was any chance that was, in fact, true. And if it is, whether or not we may see that on our MY15's.
Yes, that's completely off topic and the only official Audi press release talking about LTE I've seen is for the new A3. Not sure where they got that or if the A7 reports are accurate. I'll believe it when I see it
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Old 05-22-2014, 01:10 PM   #8
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Working in downtown Los Angeles and facing traffic on a daily basis, I use the Auto Stop feature alot. I was also wondering about when it works and when it doesn't. I have noticed that when the AC is running, the Auto Stop feature does not always work even when depressing the brake pedal fully. This does not happen consistently, however.

On occasion, with the AC off, I notice my Auto Stop does not work. Not sure why, but this has happened maybe 2-3 times where the Auto Stop does not work for the whole trip. I use it the next day and it works fine.
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Old 05-22-2014, 02:00 PM   #9
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Originally Posted by snagitseven View Post
Yes, that's completely off topic and the only official Audi press release talking about LTE I've seen is for the new A3. Not sure where they got that or if the A7 reports are accurate. I'll believe it when I see it

Well, I agree. At least about the believing it when I see it, but I guess it is "official".

https://www.audi-mediaservices.com/p...d_stylish.html
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Old 05-22-2014, 02:18 PM   #10
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Originally Posted by jatp View Post
Well, I agree. At least about the believing it when I see it, but I guess it is "official".

https://www.audi-mediaservices.com/p...d_stylish.html
Doesn't mention the US or a carrier though.
Let's leave this for another thread.
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Old 05-24-2014, 07:20 AM   #11
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I have a '14 TDI with about 5000 miles on it. I've noticed that the pedal needs to be fully depressed to engage the start/stop feature. This is so the car knows it will not start to move slowly forward and need to start the engine again. Hope that helps.
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Old 08-01-2014, 12:46 PM   #12
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I just bought a CPO 2014 A6 a few days ago, and I haven't been able to get this function to work AT ALL. I have the off switch off (light not lit), so I'm assuming the system is on.
However, on the dash, I have a white "A" (the symbol for auto stop start) with a line through it. What the heck does this mean?

I too, noticed my battery wasn't full re-charged. If Auto Start-stop relies on a fully charged battery, how do I fix the poor recharging problem? I'd think on a car with less than 7000 miles, the battery and alternator should be up to snuff.

I remember one of my previous A-6s (a 2005) had a similar problem. There was some kind of battery regulator thing that was faulty and the battery never fully charged.

Any ideas?

I need to take it in for an inspection in a few days, so I'll mention it to my service rep, but any help would be appreciated.
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Old 08-01-2014, 01:27 PM   #13
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The white line through the A means the engine won't stop. Not a full battery, regen on a TDI, or some other reason the computer feels it doesn't want to could cause it. The chances it is a battery charging issue are next to none at your miles, but could happen. Make sure to mention it at the checkup.

Last edited by DasA6; 08-01-2014 at 01:40 PM.
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Old 08-01-2014, 02:49 PM   #14
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The white line through the A means the engine won't stop.
TFM lists many reasons - page 80 in mine. Could be OP's somewhere that A/C is needed too much?
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Old 08-01-2014, 05:03 PM   #15
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TFM lists many reasons - page 80 in mine. Could be OP's somewhere that A/C is needed too much?
Right. The computer senses a load, be it energy or any other matter, that requires the engine to be running. Granted something can always be wrong, such as 'charging' a dead battery that actually isnt getting charged. I've noticed with both sides on blue and fan on high it won't turn off. It'll know when to shut off and when to keep purring. You probably just need to get used to the driving environments that demand different loads from the engine bay. The winter it would shut off all the time, but the summer it seems it just does it every now and then. But again, never hurts to mention it to the service rep.

BTW Richard, enjoy your new S6!
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Old 08-01-2014, 05:56 PM   #16
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Also, the brake must be fully depressed for the stop/start to operate. A coast to a stop with light brake pedal pressure won't allow it to engage.
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Old 08-02-2014, 11:32 AM   #17
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BTW Richard, enjoy your new S6!
Thanks! I am!!!! The US-model S6 doesn't have Start-Stop so I can't add any firsthand info.
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Old 08-02-2014, 01:16 PM   #18
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I personally hate stop/start. After so many years of driving I find it unnerving when a car randomly decides to turn itself off.

Luckily stop/start does not work when the outside temp exceeds 90 degrees F. Here in Phoenix that means it will start working in late October :-) so I have time to figure the best way to permanently disable it. I guess I found one good thing about our hot desert summers
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Old 08-02-2014, 02:10 PM   #19
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I personally hate stop/start. After so many years of driving I find it unnerving when a car randomly decides to turn itself off.

Luckily stop/start does not work when the outside temp exceeds 90 degrees F. Here in Phoenix that means it will start working in late October :-) so I have time to figure the best way to permanently disable it. I guess I found one good thing about our hot desert summers
There is a button on the dash that you can push to tuen it off permanently. I dont care for it either.
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Old 08-02-2014, 07:39 PM   #20
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There is a button on the dash that you can push to tuen it off permanently. I dont care for it either.
I thought I saw some VCDS mods to disable it completely, but provided the disable button retains its state across power on/off cycles I'd say that's the best choice.
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Old 08-02-2014, 07:39 PM
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