Fiat don't use these old generic codes, in fact according to an internet search I just did no manufacturers do anymore.
P0001 Fuel Volume Regulator Control Circuit/Open
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
Tech notes
The P0001 is an OBDII generic code, but almost none of the vehicle manufactures use it. If you are getting this code, make sure you are using the correct OBDII code scanner for your vehicle's make and model.
P0001 Description
Fuel Volume Regulator Control Circuit/Open is the generic definition for the P0001; however your vehicle's manufacturer may have a different definition for the P0001 code.
P0001 could mean pretty much anything, that's why I asked what he was using to read the codes.
Manufacturers use from P0100 onwards and they are manufacturer specific in most cases as far as I know. P0999 and below were old generic codes used by all manufacturers but they are now no longer used, so what ever code reader he is using must be an old one I guess.
Edit.
Has anyone got a list of fault codes that FiatECUScan uses?