C5 Engine immobilizer fault

odednovo · Post by **odednovo** » 10 Aug 2007, 09:49

I have a problem in my C5, sometimes, the engine fail to start, the starter motor operates normally but the engine refused to operate and there is ?engine immobilizer fault? message in the central screen.
After a few retries (I wait a few seconds between each retry) the engine start normally and I can drive the car without any problem.
Can sombody help me?

jmd · Post by **jmd** » 10 Aug 2007, 18:46

Is the car Petrol or Diesel, in the case of the latter- when was your fuel filter changed. I take it when you say the car drives normally, when started. That the message has disappeared.

odednovo · Post by **odednovo** » 12 Aug 2007, 20:46

The car is Petrol

AndersDK · Post by **AndersDK** » 12 Aug 2007, 21:00

Year, engine type, model version & mileage please ?
Anything else that indicates engine or starting problems round the corner ?

wheeler · Post by **wheeler** » 14 Aug 2007, 22:55

Could be a faulty key,if you have a spare try using that & see if the fault persists.
Could also be the key reciever aerial around the ignition barrel playing up,they are not that expensive & are very easy to fit.

wigelywoo · Post by **wigelywoo** » 15 Aug 2007, 21:08

I had this problem last night and I had to re-initialise both my keys, but then the car would start with either.

odednovo · Post by **odednovo** » 16 Aug 2007, 19:19

It seems a big problem.
I took the car to Citroen garage. They checked the keys and the antenna and they claimed that the antenna receives the signal but from unknown reason the car does not start.
They suspected that it is the engine computer, they replaced it and the car started but after a few retries the problem rose again with the message: engine immobilizer fault.

they says that they needs more time to discover the reason for the problem, they didn't know how much time it will take.
Does anybody have an idea what to do?

AndersDK · Post by **AndersDK** » 16 Aug 2007, 20:07

the "engine computer"

Thats about the most expensive part they could try first - and the least suspectible

Why didnt they just try replace the antenna coil fitted around the ignition key. This is known to play up - and is MUCH cheaper

odednovo · Post by **odednovo** » 18 Aug 2007, 21:52

I asked them this question.
They insists that the antenna is OK and it transfers the signal to the computer.

odednovo · Post by **odednovo** » 12 Sep 2007, 07:32

according to citroen garage it was the fusebox, they replaced it.
Seems the probelm fixed

French Car Forum

C5 Engine immobilizer fault

C5 Engine immobilizer fault

problem fixed