2019 XC90 Start/Stop not working

[TyRees79]

Hi,

Having problems with our Volvo XC90 and its start/stop feature.

Bought the car a few months ago and it's still under warranty, but want to know if anyone else has had this problem.

So, when we drive away the start/stop will show on the dashobard as green and when we stop it will kick in, then we drive off it will not work again. We had a new battery fitted a month ago under warranty and since then the Start/Stop support battery service required warning came on our dashboard. This has not shown for a while though, so thats a mystery.

The garage who fitted the battery said the car has to stay still for a minimum of 6 hours after the battery change for the start/stop to work properly??

Has anyone had this issue, and I'm after information to throw at the garage we bought it from in.

Regards

[nu11eaf]

First thing to do is put batteries on charge overnight or longer if you can using a smart charger connected to the charge posts in engine bay, then see if stop start works ok. Using the engine bay charge posts will boost the starter and aux start stop batteries at the same time.

[TyRees79]

But the battery is brand new and fully charged? it did not work after fitting the new battery??

[Mad Malc]

You have been given good advice.

[MikeGMT]

All the following conditions have to be met for the Stop/Start to work. As you can see there is quite a lot of reasons it may not work.

• The car has not reached approx. 10 km/h (6 mph) after starting.
• After a number of repeated auto stops, speed must again exceed approx. 10 km/h (6 mph) before the next auto stop.
• The driver has unfastened the seatbelt.
• The capacity of the starter battery is below
the minimum permissible level.
• The engine is not at normal operating tem- perature.
• The ambient temperature is below
approx. -5 °C (23 °F) or above approx. 30 °C (86 °F).
• The windscreen's electric heating is acti- vated.
• The environment in the passenger compart- ment deviates from the set values.
• The car is reversed.
• The starter battery's temperature is below or above the permitted limit values.
• The driver makes sweeping steering wheel movements.
• The road is very steep.
• The bonnet is opened.
• When driving at high altitudes when the engine has not reached operating tempera- ture.
• The ABS system has been activated.
• In the event of heavy braking (even without
the ABS system having been activated).
• Many starts during a short period of time have activated the starter motor's thermal protection.
• The exhaust system's particulate filter is full. • A trailer is connected to the car's electrical
system.
The following applies to automatic gearbox:
• The gearbox is not at normal operating tem- perature.
• The gear selector is in M (±) position.

Just to put your mind at rest (maybe!) I have experienced all the problems you have expressed, except having a new battery fitted. About two months ago I had the Start/Stop Service Required message flash up for the first time ever. I put the battery on charge and everything resumed as normal for a few weeks, then the message re-appeared. I just ignored it this time and about a week later the Stop/Start sprang back to life. Know I just ignore the message and I am confident when the right conditions are met the system will decide to work again if the car is getting a few good runs. If the car is not getting used as much I just put it on a trickle charge every now and then.

[Clan]

Originally Posted by TyRees79

But the battery is brand new and fully charged? it did not work after fitting the new battery??

what is the 12v battery voltage first thing in the morning before you start it ( measure with everything off)

[nu11eaf]

Originally Posted by TyRees79

But the battery is brand new and fully charged? it did not work after fitting the new battery??

Yes you said in your first post, my advice is still the same, this usually sorts it out and is the easiest first thing to try.