Are all brake lights working correctly?

 

Yep

 

you could try disconnecting and reconnecting the tail light - check this video for how get access

failing that probably need to replace one of the tail lights

 

Thank you, I will try that

 

Like mentioned above it probably is the wires to the tailgate. Put your lights on then open/close the boot slowly. Often you’ll see a flicker for a second as the wire connection will become intermittent.

 

I will try that and give you feedback

 

if all the tail lights are working as they should and you are getting a random error, coupled with the fact you say your cruise control is not working sounds strange

does your stop start work as it should ?

if stop start is unavailable coupled with random phantom errors, it could be battery related ... how old is the battery ?

 

if all the tail lights are working as they should and you are getting a random error, coupled with the fact you say your cruise control is not working sounds strange

does your stop start work as it should ?

Yes it works as it should

 

I erased every errors except “ B100C-92 “ but they popped up again it seems like something with the BCM I dont know😫

 

ok, if the battery was replaced recently then IBS needs to verify a healthy state of health and that could take up to a week for it to learn - those errors could be persistent in the storage until the IBS clears the state of health of the new battery

does your stop start work ? even with the new battery that could take a while to work again

 

My battery worked a day after the replace of the battery

 

Ok, I thought that is what you meant, was just checking on an important detail

sounds like it didnt start working again till the next day, so does that mean it stopped working with the old battery ?

the reason I am stuck on that point is to determine or guess you may still be getting errors because the IBS has not learnt a healthy battery yet ... and it may disappear as soon as it does, ... so it may just take a few days for it to work its way through all the diagnostics ... then you may need to clear the errors again

just trying to eliminate the easier stuff first

 

Generally, the IBS takes hours rather than days to recalibrate after battery replacement.
The acid test is whether STOP/START and HRW are still working 2-4 weeks later.
If not, either:

1. there is some stray current draining the battery when the car is off.
2. the IBS is defective
3. the car isn't driven long enough and often enough for the battery to be maintained at an SoC sufficient for S/S and HRW to be available

A large number Giulia batteries are getting replaced unnecessarily. Anyone suspecting a Giulia battery should eliminate 1-3 before getting a new battery. 6 years and 75,000 miles in my first Quadrifoglio without battery replacement. S/S disabled of course.

 

Generally, the IBS takes hours rather than days to recalibrate after battery replacement.

mine took over a week for stop/start to become active after a brand new battery was installed ... which fixed the problem btw (bizzare errors like ECM BCM ACC infotainment, steering errors ) ... no headlights or tailight errors though,
OP could have two separate issues

many people report similar ... nowhere have I heard hours, and nowhere have I heard 6 years

A large number Giulia batteries are getting replaced unnecessarily.

a very high percentage of people who report bizarre problems like this have had them resolved after the battery was replaced, and not until the IBS re calibrates, and that time will vary

where do you get "many unnecessarily" from ?

 

You might choose to do an advanced search of this forum for all my posts which contain the word battery or SoC.
Many batteries have been changed because individuals address the consequences of a system issue not their cause
I didn't claim that the OP had unnecessarily changed his battery, but that many have.

I am a professional engineer with 50 years in design of complex systems and diagnosis of their problems.

 

I didn't claim that the OP had unnecessarily changed his battery, but that many have.

so then why is it relevant ?

the OP said his battery was dying and thus replaced it - he then needs IBS to re calibrate and hopefully that will clear his persistent errors if it was the battery that caused this headlight/rear light/FCW problem with these errors

if not, then he may have a problem, but his battery was replaced for a separate reason


everything else is white noise, irrelevant and pointless speculating - you should know that you are an engineer

 

Following a recent illness, today was the first time in almost 5 weeks that I was able to take my 3 year old Giulia out.
It started 1st time and the HRW worked as it should, clearing the mist on the inside.
Stop/start I have permanently turned off so I don't know if that works or not.

 

As well as SoC there are lots of factors that will cause the Body Computer to disable S/S. Things like the temperature requested and the temp it currently is in the car being significantly different. Mine never seems to work with the heated seats on when it's cold... There seem to be lots of parameters which will stop it from working tbh.

 

Following a recent illness, today was the first time in almost 5 weeks that I was able to take my 3 year old Giulia out.
It started 1st time and the HRW worked as it should, clearing the mist on the inside.
Stop/start I have permanently turned off so I don't know if that works or not.

Sorry you've been able to make little use of your Giulia recently, but very pleased to hear you're back behind the wheel again.

The 'Intelligent' Battery System will try to maintain the battery SoC at 80%. The HRW threshold is 60%. If there are no stray currents draining the battery, It will take several weeks to drop from 80-60%.

As well as SoC there are lots of factors that will cause the Body Computer to disable S/S. Things like the temperature requested and the temp it currently is in the car being significantly different. Mine never seems to work with the heated seats on when it's cold... There seem to be lots of parameters which will stop it from working tbh.

There are indeed a long list of things which can prevent S/S working, I recall @jwq published the full list 6 or so years ago. Its threshold, I think, is 70% SoC
But who cares that the S/S isn't working? It is bad for the engine and battery etc and is best disabled. HRW is another matter altogether.