My Automatic Start/Stop system is broken...

[Botch]

...and I'm not gonna fix it!

I bought an '18 A5 Cabriolet (my first/only brand-new car), and am coming up on my 20,000-mile oil change/periodic maintenance. I noticed, about 3 months ago, that my Start/Stop system quit working; She no longer kills the engine, no matter how long I'm stopped or how hard I press the Brake (it is, er was, brake-sensitive). To Audi's credit, this is the ONLY fault I've experienced for 20K miles. I've actually placed a piece of masking tape over the Start/Stop Kill button, so I don't inadvertently hit it and reset what may be a software hangup.

I've read that the Start/Stop function was built-in to pass US Emission/Mileage requirements; the test includes up to ten-minute periods of no-load idle (not very realistic, to my mind). I've also read that, both, a) the amount of fuel saved is minuscule, and b) the wear/tear on the starter, battery, and engine (once warm) is also minuscule. It bothers the heck out of me feeling the car shudder to start the engine when I lift my foot off the brake, but, "first-world problems".
I don't know if this system is even included on Audis in other countries.

[dal59]

...and I'm not gonna fix it!

I bought an '18 A5 Cabriolet (my first/only brand-new car), and am coming up on my 20,000-mile oil change/periodic maintenance. I noticed, about 3 months ago, that my Start/Stop system quit working; She no longer kills the engine, no matter how long I'm stopped or how hard I press the Brake (it is, er was, brake-sensitive). To Audi's credit, this is the ONLY fault I've experienced for 20K miles. I've actually placed a piece of masking tape over the Start/Stop Kill button, so I don't inadvertently hit it and reset what may be a software hangup.

I've read that the Start/Stop function was built-in to pass US Emission/Mileage requirements; the test includes up to ten-minute periods of no-load idle (not very realistic, to my mind). I've also read that, both, a) the amount of fuel saved is minuscule, and b) the wear/tear on the starter, battery, and engine (once warm) is also minuscule. It bothers the heck out of me feeling the car shudder to start the engine when I lift my foot off the brake, but, "first-world problems".
I don't know if this system is even included on Audis in other countries.

Sounds to me like to car fixed itself. :)

[DJT]

Most annoying feature on any car I’ve owned. Spent $40 last week and a 10min installation of this switch that fixed it for me: https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

[ismailjuve]

Sounds like there is no issue i had that coded out


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[isisyosin]

This is the worst piece of technology ever implemented in cars. Whomever came up with the stuff should be bitch slap. I coded it out as well as my wife and I felt it was dangerous for us. The car would turn the engine off at times while waiting on incoming traffic to make a left turn. Also at the drive through with 90+ temperatures here in South Florida. Terrible.

[SHCKR]

Are you sure it's not because it's getting warmer and your AC is always on? Or your battery is dying?

[CurvesAhead]

Auto Start Stop = ASS

[DCB1951]

Intermittently-working Auto Stop/Start = ½ASS

[CurvesAhead]

Intermittently-working Auto Stop/Start = ½ASS

Perfect (LOL)!

[dal59]

Yes, I was DELIGHTED to see that the 2021 RS5 did not come with it. No button to shut it off, it is just non existent.

[ywang98]

Yes, I was DELIGHTED to see that the 2021 RS5 did not come with it. No button to shut it off, it is just non existent.

Yeah, I saved my S4's disable module, thinking that I could install it on the RS5. I was like, what? No ASS! LOL Hurray!

So now, I have a ASS disabling module sitting there. Anyone who wants it, please let me know.

[Botch]

Most annoying feature on any car I’ve owned. Spent $40 last week and a 10min installation of this switch that fixed it for me: https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Thanks much for posting that. I've added it to my "Cart", in case my battery is going out and a new one will re-enable the "feature". :D

[c99]

...and I'm not gonna fix it!

I bought an '18 A5 Cabriolet (my first/only brand-new car), and am coming up on my 20,000-mile oil change/periodic maintenance. I noticed, about 3 months ago, that my Start/Stop system quit working; She no longer kills the engine, no matter how long I'm stopped or how hard I press the Brake (it is, er was, brake-sensitive). To Audi's credit, this is the ONLY fault I've experienced for 20K miles. I've actually placed a piece of masking tape over the Start/Stop Kill button, so I don't inadvertently hit it and reset what may be a software hangup.

I've read that the Start/Stop function was built-in to pass US Emission/Mileage requirements; the test includes up to ten-minute periods of no-load idle (not very realistic, to my mind). I've also read that, both, a) the amount of fuel saved is minuscule, and b) the wear/tear on the starter, battery, and engine (once warm) is also minuscule. It bothers the heck out of me feeling the car shudder to start the engine when I lift my foot off the brake, but, "first-world problems".
I don't know if this system is even included on Audis in other countries.

Main reason for not working ASS is low battery voltage. These cars have bad charging algorithm so after while (something like 10 weeks in city driving cycles) voltage is low, so ASS doesn't quit engine due to battery energy saving.

[jhAudi]

Most annoying feature on any car I’ve owned. Spent $40 last week and a 10min installation of this switch that fixed it for me: https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Any issues with any warning lights or codes? Hated this on my last car and still hate it on the S5. I normally turn it off right away but every once in a while I forget and the car shuts off and for some odd reason it makes me mad when it happens.

[PDXFlyGuy]

Any issues with any warning lights or codes? Hated this on my last car and still hate it on the S5. I normally turn it off right away but every once in a while I forget and the car shuts off and for some odd reason it makes me mad when it happens.

I bought this a week ago and have had had no issues. It took 5 minutes to install and works great.

[DJT]

No issues or codes at all...it worked the second I plugged it in and going strong.

[CurvesAhead]

No issues or codes at all...it worked the second I plugged it in and going strong.

Same here, about 13 months and perfect, no codes, it just works every single time I start the car.

[jhAudi]

No issues or codes at all...it worked the second I plugged it in and going strong.

Put it in yesterday. Crazy easy to install. Super happy to have seen this thread.

[JeffSteff]

Anyone that has this remove it prior to dealership service?


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[NJS5]

Anyone that has this remove it prior to dealership service?

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Just had my 3year/30,000 mile service done. Didn’t even think to remove it. No mention of it when I picked the car up.