Fiat Doblo 2009 immobiliser problem

[Rev03]

Hi can anyone help me I have a problem with my van, the Immobiliser light flashes three times then stays on and engine turns over but won’t start. The engine management light doesn’t show up and the diesel glow plug light does not show up either. I also have codes reading B1029 & U1602.

Thanks

 

[varesecrazy]

Hi

Sounds like a fundamental wiring issue

Can you tell us more about vehicle history..

Which engine.. miles covered

Time owned.. any major work.. or blown fuses lately..

Some are simple.. some are unique

Charlie

 

[Rev03]

It’s a ex-BT fleet vehicle then 120,000 miles full service history it was working fine I parked it in the garage for a week went to start it and the Immobilser light was flashing then stayed on permanently. So I had a auto locksmith to come and reprogramme the key as that’s what I thought it was he said there was no problem with communication with the key but the body control module was not communicating with the ecu correctly.

 

[varesecrazy]

Battery getting low might be a factor..

There are reports of flat batteries causing airbag ECU problems..
But not heard of immob. trouble

 

[Rev03]

I don’t think it is the battery as it’s fully charged and the engine turned over perfectly well I’ve hopefully got somebody today coming to look at the electrics on it thanks for your reply

 

[portland_bill]

Have a look at this thread, seems similar.
https://www.fiatforum.com/newbie-central/480310-anyone-able-help-my-doblo-2.html?p=4532404
Might be an idea to remove the radio and see if that fixes it.

 

[jackwhoo]

I'm with varesescary on this one in thinking possible battery issue.

What is battery voltage while engine turning over on starter motor?

Something else you can try is disconnecting the battery for half an hour, reconnecting battery and try start.
Makes sure keys in your pocket when disconnecting / reconnecting battery.