15 Jun, 15

BMW CAS3 Immobiliser Module Repair

BMW 5 Series CAS3 Immobiliser Module TestingBMW CAS3 (Car Access System) Immobiliser ECU Repairs
Are you having ignition problems? Does your BMW vehicle not start? If so, this could be due to an issue with your CAS immobiliser module.

The CAS immobiliser module (transponder box) serves as an antitheft alarm system and enables the start of BMW vehicles. Within each vehicle key there is an integrated transponder chip, and a coil ring which is fitted around the ignition lock. The transponder chip is powered by this coil from the CAS module, meaning that no battery is necessary within the key. When your key is inserted in to the ignition, the transponder in the key is powered via the loop antenna, and key data is sent to the CAS control module. If the key data is correct, an enable signal is then sent to the starter and the CAS module then sends the random code to the Engine Control Module (DME / DDE) where the random code is checked against the saved random code. Only if they match, is the fuel injection released allowing the car to start.

Common faults associated with the BMW CAS3 Immobiliser module
As mentioned above, some of the issues that you may encounter if you have a problem with your BMW CAS3 module are:

  • Immobiliser Fault Codes
  • No Communication with CAS3 Module
  • Vehicle Won’t Start
  • Key Not Recognised

Most workshops will advise to replace the immobiliser module because they are unable to repair it. It’s not possible to replace them with a second hand part because the unit will be locked to the vehicle it came from and unless you’re buying a complete immobiliser kit, you will require a new CAS3 module and the unit must be programmed.

CAS3 Immobiliser Module Repairs – By Sinspeed
Here at Sinspeed, we’re able to fully test and repair the BMW CAS3 immobiliser module using new genuine OEM components and uprated components where possible to ensure each and every repaired BMW CAS3 ECU is rebuilt to meet & exceed OE specifications. All remanufactured units are returned with a Lifetime warranty and will not require programming.

If you have a BMW CAS3 Immobiliser fault, give us a call today on 0203 815 9441.

58 thoughts on “BMW CAS3 Immobiliser Module Repair
  • Hi
    How much does it cost to repair. Car Details: e90 250i 2005, petrol, manual.

    thanks.

    • Hi Mohayyad

      Thanks for the enquiry,

      I have sent you an email with full information and pricing.

      Kind Regards

      Jason
      SINSPEED

  • Hello,
    I am reaching out to you from the us. I have a bunch of fault codes for my cAS on an e93. How much would i be looking at if I was able to send you my cAS?

    Best,
    Harry A.

    • Hi Harry

      Thanks for the enquiry,

      I have sent you an email with full information and pricing.

      Kind Regards

      Jason
      SINSPEED

  • I need a Cas3 Repairing as there’s no ignition and the steering lock won’t release part No.6943830-01

    • Hi Keith

      Thanks for the enquiry,

      We can certainly take a look at this for you. I have sent you an email with full information and pricing.

      Kind Regards

      Jason
      SINSPEED

  • Hi i need cas 3 module repairing as mine wont realease the steering lock and on the odd occa it does car will not start how much does this cost ? Thanks kris

    • Hi Kris

      Thanks for getting in touch,

      We have sent you an email with full details and pricing.

      Kind Regards

      Sophie
      SINSPEED

  • Hi, presently I have a cas3 with the following fault codes:

    00A114 CAS: Line fault, el. steering lock
    00A103 CAS: Immobilizer bus fault
    00A116 CAS: Critical status, el. steering lock
    00C91E No message (terminal status, 0x130), receiver JBE, transmitter CAS

    How much would it cost to repair the module ?

    • Hi Damian

      Thanks for getting in touch,

      We have sent you an email with more information.

      Kind Regards

      Sophie
      SINSPEED

  • Hi, How much To diagnose the cas, becas the steering locked, we had to Remove the locking mechanism as The ignition does not come on. Non start issue.
    Thanks.

    • Hello Rohit

      Thanks for getting in touch,

      We have sent you an email with full details and pricing.

      Kind Regards

      Sophie
      SINSPEED

  • Hi I have a used CAS 3 unit that I purchased on ebay for my BMW E90 2006/7 model.

    No one here seems to know how to program the CAS with my chassis number vs the old vehicle number. Can you assist?

    Regards,

    Derrick

    • Hello Derrick

      Thanks for getting in touch,

      We have sent you an email with full details and pricing.

      Kind Regards

      Sophie
      SINSPEED

  • Hi I have a BMW x5 2009 E70. This car was good, but after a week of not starting the battery was empty and the car was tried to start running and everything works but engine does not work. Seems like it’s not getting fuel. Tried to read the car via OBD, but reading is also not possible. All fuses checked and is good. What is the cost from this repair,?
    Please advice stef l

    • Hello

      We have sent you an email with full details and Pricing.

      Kind Regards

      Sophie
      SINSPEED

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