2001 C5 IMMOBILISER PROBLEMS

carpy · Post by **carpy** » 26 Sep 2011, 20:06

Hi all, have been working on the car trying to fix the suspension and now a new problem has arisen or several I think. I get the economy mode active message even after I have charged the battery. The interior lights don't come on, the windows don't work and the immobiliser light is on so the car won't start. The remote opens the central locking but the indicators don't flash like they used to. Any thoughts please.
ps I have tried the search function on a multitude of keywords but haven't found anything.
Many thanks

The Birdman · Post by **The Birdman** » 26 Sep 2011, 20:46

I would say that the battery was near empty and wiped the keys out , peugeot and citroens hate bad batterys ,
get a new battery and recode your keys .

cachaciero · Post by **cachaciero** » 26 Sep 2011, 22:05

I would agree with Birdman except that it won't have wiped the keys, they are hard coded, if it can't come out of economy mode then the requirement for an engine start arn't being met. Economy mode locks out lots of electrical loads.

cachaciero

carpy · Post by **carpy** » 26 Sep 2011, 22:29

Thanks for the replies. Any ideas how to get the immobiliser off. The battery itself is showing just over 12 volts and cranks the engine seemingly ok.

wareb321 · Post by **wareb321** » 27 Sep 2011, 21:28

I had the same problem with my 2001 C5 after I changed the car battery. It would crank, but not start and the immobiliser light was on. I think I put the key in the ignition slot, turned the ignition on and then held the key button down for 10 seconds. This seemed, this seemed to re-link the key with the immobiliser again, and it started.

Hope this helps.

carpy · Post by **carpy** » 28 Sep 2011, 23:20

Hi tried that and it hasn't worked, at a loss now

wareb321 · Post by **wareb321** » 29 Sep 2011, 21:47

Try disconnecting the car battery for 2 mins, reconnecting, allow 1 minute to start-up, then try the procedure I mentioned before. Also, do not leave the keys in the car while you disconnect/re-connect the battery. Do a search on the forum for the exact battery disconnect procedure if you want to do it properly.

If this still fails, then I'm afraid your key is no longer programmed to the immobiliser. Do you have a spare key you can try? I think you need the original key code number that came with the car to re-program the key.

Hope this helps

carpy · Post by **carpy** » 29 Sep 2011, 22:24

Hi, thanks for the input, will give it a go tomorrow