Question about 2000 Volvo S40

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Immobilizer Car wont start, appears to be immobilizer as when key is put in and turned nothing happens and immobilizer light indicates that the immobilizer is still active

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  • Anonymous Mar 15, 2014

    car won't start, immobilizer light on

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If there is a blinking car icon with an "X" over it. This icon means the Immobilizer has been activated and hence won't allow the car to start. It could be due to a bad SCU, Start Control Unit. The SCU is actually the ignition switch on these cars.
Most of the time it's triggered by the anti-theft system..You can try this trick i learned that the dealers won't tell you...try locking and unlocking of the doors five times with the remote to reset the immobilizer and see if this helps.
Good luck..i hope this helps...please take a minute to rate me a fixya.

Posted on Jul 15, 2009

  • beth Nov 29, 2012

    I tried this for my husbands 2008 volvo. Because he is having the exact same issue. His car is now sitting in the driveway with the headlights on, it won't lock now either.

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Try another key, sometimes the key immobilizer chip gets flaky. If that is not it, then the next probable cause is the antenna ring surrounding the key hole.

Posted on May 13, 2009

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    You have an electronic immobilizer key recognition problem. Now your key chip is not recognized by the transponder antenna fitted on the ignition switch barrel.

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    This warning lamp indicates that the engine is locked by the immobilizer system, and the engine start sequence must be repeat again.

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    tdisline_775.jpg


    This warning lamp indicates that the engine is locked by the immobilizer system, and the engine start sequence must be repeat again.

    From year 1995 in Audi-VW (VAG) cars is used engine immobilizer. The VAG group immobilizer system consists of an immobilizer ECU which controls the recognition of keys and the Engine Management ECU system. Immobilizer is activated when the ignition key is removed and, together with the engine control unit, largely prevents unauthorized starting of the engine. The system uses a transmitter and receiver unit in the ignition key (transponder). Whenever an attempt is made to start the engine, it transmits a new code to the car's electronics. The immobilizing is only cancelled and car motor electronic receives permission to start engine if the key sends a right authorization code.

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    Keep other keys away from your vehicle’s key and the ignition switch while trying to start the engine.
    Do not attempt to alter this system or add other devices to it. Electrical problems could result that may make your car undriveable.
    This indicator will also blink several times when you turn the ignition switch from ON (II) to ACCESSORY (I) or LOCK (0).
    If the system repeatedly does not recognize the coding of your key, contact your Honda dealer.
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