Grande Punto Punto immobiliser problems

[Bbendy41]

I had the alternator changed on my Punto by mobile mechanic. All was well until went to turn the car over and now the immobiliser has come on and car won’t start now.

 

[varesecrazy]

I had the alternator changed on my Punto by mobile mechanic. All was well until went to turn the car over and now the immobiliser has come on and car won’t start now.

Hi.

Same with both keys?

Its possible the cars CANBUS network doesnt recognise the alternator.

Try disconnecting battery negative lead.. and checking other connections .. then reconnect an hour later.. might just reset something.


The GP does seem very fussy about teplacement alternators.

Can : did the mechanic attempt to pair new devices with a relearn ?

 

[Bbendy41]

Hi, yeah both keys are not working. I have a auto locksmith looking at the car and even he’s having problems. He’s coming back tomorrow morning again.

 

[varesecrazy]

Hi.

Personally.. I would disconnect the alternator.. then when reconnecting the battery.. see if keycode light goes out.

If it does.. you need a replacement alternator the cars system can live with.

Cheap replacements have caused isdues before.. but not normally with the Immobiliser.. so worth unplugging.. check wiring . Etc.

 

[varesecrazy]

cmosfxx may have seen some of this in their grande ownership..

Here is another post :

https://www.fiatforum.com/grande-pu...nt-start-help-please.html?416025=#post3998607


I had forgotten about the earth lead.. not actually had one fail myself.
Bbendy41

Do look at the FAQs for the electrical checks article https://www.fiatforum.com/grande-punto/318839-electrical-gremlin-thread.html

 

[cmosfxx]

Most of the times it's just a bad battery.

Is the battery charged and in good condition?

The alternator is not in can-bus network but the voltage output is controlled by the ecu. Bad alternator or starter can drain/short the battery.

 

[Bbendy41]

Hi. It’s a new battery in the car

 

[Bbendy41]

Hi.

Personally.. I would disconnect the alternator.. then when reconnecting the battery.. see if keycode light goes out.

If it does.. you need a replacement alternator the cars system can live with.

Cheap replacements have caused isdues before.. but not normally with the Immobiliser.. so worth unplugging.. check wiring . Etc.

Will pass this on to mechanic

 

[Bbendy41]

Hi.

Same with both keys?

Its possible the cars CANBUS network doesnt recognise the alternator.

Try disconnecting battery negative lead.. and checking other connections .. then reconnect an hour later.. might just reset something.


The GP does seem very fussy about teplacement alternators.

Can : did the mechanic attempt to pair new devices with a relearn ?

tried disconnecting the battery and left over night but didnt do anything. How do you go about the pairing of the alternator so i can suggest to the mechanic

 

[Bbendy41]

Will pass this on to mechanic

hi, i have checked and that has already been tried

 

[Bbendy41]

Hi.

Personally.. I would disconnect the alternator.. then when reconnecting the battery.. see if keycode light goes out.

If it does.. you need a replacement alternator the cars system can live with.

Cheap replacements have caused isdues before.. but not normally with the Immobiliser.. so worth unplugging.. check wiring . Etc.

hi, yeah thats been tried and still nothing

 

[varesecrazy]

Had you owned the car long?

Could be an existing problem..

If not probably related to the alternator work