[Shockvalue]

The notorious stop/start system hadn’t been working in my Stelvio for around 12 months. At it’s recent service the battery was assessed at 51% and replacement was recommended.
The battery was replaced with a new genuine Alfa part Mopar AGM battery. I fully expected the stop/start system would be activated again. After 2 days of driving still not working.
It is being recalled to check if the calibration has been correct.
Could there be an issue with the IBS? I thought I read somewhere in regard to a new battery installation that it can take a few days of driving to auto calibrate and this can eventually activate the stop/start.
Not particularly a fan of stop/start but as it is a system in the vehicle I would prefer it to be working.

 

[jwq2]

The notorious stop/start system hadn’t been working in my Stelvio for around 12 months. At it’s recent service the battery was assessed at 51% and replacement was recommended.
The battery was replaced with a new genuine Alfa part Mopar AGM battery. I fully expected the stop/start system would be activated again. After 2 days of driving still not working.
It is being recalled to check if the calibration has been correct.
Could there be an issue with the IBS? I thought I read somewhere in regard to a new battery installation that it can take a few days of driving to auto calibrate and this can eventually activate the stop/start.
Not particularly a fan of stop/start but as it is a system in the vehicle I would prefer it to be working.

Even with a new battery, it still depends on the battery state-of-charge.
Don't know if the battery was fully charged when installed, but I'd check battery voltage just to be sure .....

 

[Alfie]

Even with a new battery, it still depends on the battery state-of-charge.
Don't know if the battery was fully charged when installed, but I'd check battery voltage just to be sure .....

I think that's why he stated 'driving the car for a while' but it all depends on how long of a distance you drive once you start the car. Most of those living in cities could take a month of two whereas if you live in the boonies, 2-3 days. as jwq2 said, best thing to do is to charge it fully then test it. Most vendors will replace the battery with one that's has been sitting on the self for month or two. They seldom charge the battery right before replacement.

 

[Chasriff]

I always have a C-Tek battery tender on hand - everyone should get one. Never hurts to fully charge once in while after a bunch of short trips. Our cars have so much technology in them that rely on consistent voltage.

 

[Alfie]

The notorious stop/start system hadn’t been working in my Stelvio for around 12 months. At it’s recent service the battery was assessed at 51% and replacement was recommended.
The battery was replaced with a new genuine Alfa part Mopar AGM battery. I fully expected the stop/start system would be activated again. After 2 days of driving still not working.
It is being recalled to check if the calibration has been correct.
Could there be an issue with the IBS? I thought I read somewhere in regard to a new battery installation that it can take a few days of driving to auto calibrate and this can eventually activate the stop/start.
Not particularly a fan of stop/start but as it is a system in the vehicle I would prefer it to be working.

just a thought... is this a car you bought new? If you bought it used, there maybe a de-activator added to the control assembly.

 

[drfnw]

just a thought... is this a car you bought new? If you bought it used, there maybe a de-activator added to the control assembly.

I did think that many owners would like to have the OP problem of start/stop not working. But, all kidding aside, I want everything on my car to work.

 

[Peter A]

Before doing anything, ensure the new battery is fully charged. Just driving around will likely not do the trick. Stop start won’t work until the car is warmed up, and I think won’t work in really cold temps. Check the manufacture date on the battery.

 

[jwq2]

Before doing anything, ensure the new battery is fully charged. Just driving around will likely not do the trick. Stop start won’t work until the car is warmed up, and I think won’t work in really cold temps. Check the manufacture date on the battery.

and depending on climate control reaching set temperature, etc.etc.
There are a myriad of factors that will effect auto start/stop working (or not) ......

example:

 

[ALFAOFFROAD]

Check the battery charge, if it's low charge it up.

If it gets low again... You don't just have a normal low battery, something else happening too.

Probably the "new" battery didn't have a full charge and the IBS system in the car hasn't charged it fully cause thats what it thinks is intelligent. If you charge it up, it'll be fine though because the IBS system will maintain it at whatever charge it's at. So if the battery is full IBS will keep it full.. but if its half charge..IBS might just keep it half full.

 

[My Beautiful Stelvio]

My 2020 TI start/ stop hasn’t worked for quite awhile now. Everything else works as it should. I’ve checked battery with two different volt meters over a few months and it is fully charged. Honestly, I’m glad not to have to remember to manually disable start/ stop every time I start the car. I’m in Southern California with a mild climate so I’m pretty sure it has nothing to do with the climate control system. Whether it’s a short or long drive start/ stop doesn’t activate. Frankly, my car is amazing and has been since I purchased it new in 2020 and start/ stop not activating is something I’m happy with.

 

[Siciliano]

Maybe I solved this? My start/stop quit working after one year. I installed a new Interstate battery and start/stop began working again. After one month it stopped working and that has been my situation for the past two years. During that two years, I thoroughly tested the battery, charged the battery, played with the start/stop switch on the dashboard, tried disconnecting the amp for my subwoofer and watched many Youtube videos. Nothing worked. Finally, I happened upon a video shot by John Montgomery at Benson Alfa Romeo in Greer, South Carolina. In fact, he's posted a number of videos explaining that even the slightest corrosion on battery posts can throw all sort of error codes and other problems.

So, I followed his exact instructions: Disconnect the negative battery cable and remove the negative attachment assembly from the negative battery post. Then, scrub the battery post with a battery post tool and the inside diameter of the clamp with a small wire brush . Then, remove the fuse block on the positive side and do the same cleaning there; positive post and clamp I.D.
In addition to his video instructions and for added measure, I also removed the two bolts that hold down the yellow sensor to the fuse block, wire brushed the metal attachment points and reinstalled. I also wire-brushed the negative stud (attachment point of negative cable) and disconnected and re-seated the IBS connector from the negative side attachment assembly.
Note; none of these terminals or connection points looked dirty or corroded and I held little hope of success while working.

After one or two short trips, start/stop began working perfectly and has been doing so for six days straight since this procedure. Time will tell whether this will be a permanent fix or just another rabbit hole.
Hopefully, this might help the other two people on this forum who want this feature to work....
Here is a link to the video: Cleaning battery posts

 

[MarkP]

Before doing anything, ensure the new battery is fully charged. Just driving around will likely not do the trick. Stop start won’t work until the car is warmed up, and I think won’t work in really cold temps. Check the manufacture date on the battery.

I'm in Minnesota, and the stop/start was not working when I bought my 2018 Stelvio a year ago with 21K miles. The dealer replaced the battery and it has worked fine since, although it stopped working the last couple days which have featured high temps in the single digits. As this poster mentions, stop/start does not work in the cold, meaning I've probably seen the last of mine until May. In my experience, when the air temp gets much below freezing, stop/start is either very erratic or doesn't activate at all.

I know many contributors on this forum hate the stop/start, but overall I like it, especially when I'm sitting at a long stoplight while not burning $4/gallon 92 octane gasoline. I agree it can be annoying particularly when driving an urban neighborhood with stop signs every block or two, but that's the time to use the kill switch!!

 

[jwq2]

.....
After one or two short trips, start/stop began working perfectly and has been doing so for six days straight since this procedure. Time will tell whether this will be a permanent fix or just another rabbit hole.
Hopefully, this might help the other two people on this forum who want this feature to work....
Here is a link to the video: Cleaning battery posts

Note this might also be due to the reset of the IBS you caused ......

 

[Siciliano]

Note this might also be due to the reset of the IBS you caused ......

Yep... I've been thinking the same thing !

 

[Strmtrpr]

The notorious stop/start system hadn’t been working in my Stelvio for around 12 months. At it’s recent service the battery was assessed at 51% and replacement was recommended. The battery was replaced with a new genuine Alfa part Mopar AGM battery. I fully expected the stop/start system would be activated again. After 2 days of driving still not working. It is being recalled to check if the calibration has been correct. Could there be an issue with the IBS? I thought I read somewhere in regard to a new battery installation that it can take a few days of driving to auto calibrate and this can eventually activate the stop/start. Not particularly a fan of stop/start but as it is a system in the vehicle I would prefer it to be working.

I had what I thought was a similar issue. My car was towed 3 times and the battery was replaced 3 times ( the dealer advised against replacing with the OEM battery since that would void the warranty). The last time they thought it was fixed they couldn't start it to return it to me the day theat I came to pick it up. The same problem that I was having. That was December 2 and its now March 17. Working through lemon law and not able to talk to anyone at Alfa Romeo because according to Alfa Romeo "Premium Care" that department is not consumer facing. WT*?

 

[Hoosbeach]

My stop/start function stopped working and the dealership performed a maintenance function that fixed it. If I can find my paperwork I will post it.

for me if that function is not working with a good battery then something is not right with your cars software

 

[Bladecutter]

the battery was replaced 3 times ( the dealer advised against replacing with the OEM battery since that would void the warranty).

This doesn't make any sense.
How does replacing the OEM battery with an OEM battery void the warranty?
How does replacing a faulty OEM battery with ANY properly functioning battery void the warranty, for that matter?

 

[dianebrat]

This doesn't make any sense.
How does replacing the OEM battery with an OEM battery void the warranty?
How does replacing a faulty OEM battery with ANY properly functioning battery void the warranty, for that matter?

There's a lack of clear communication with this poster, they said in multiple threads that they had a 2019, so it's not a 1 post mistake, but 3 times in a row.
When you think of all the batteries replaced here, having a dealer replace an OEM with an AGM is like finding a needle in a haystack, they're adamant about replacing OEM with OEM.

So while I'm sure they have a problem, that level of looseness with the facts makes me doubt the accuracy of their reporting of the issues.