Question about 2007 Chevrolet Tahoe

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My 2007 tahoe security light came on and now my car wont start. Do you have any idea how to unlock the security? I have tried looking in my manual and no clue

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  • srosejones Feb 28, 2009

    2003 tahoe. Security light shows locked and the car won't start.

  • mdsteelhorse May 11, 2010

    make sure that you havent damaged the keyless entry on your keychain there is a chip inside that if it is gone it wont allow you to start you car

  • Frank Harper
    Frank Harper May 11, 2010

    You're still under warranty. Call the Chevy dealer. If they can't give you an answer they have to tow her in and fix it!

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It's the passlock system that is acting up.. I have the same problem at the moment but mines came from disconnecting my stereo system, the power wire sparked and toasted one of the computers. now the important thing is if the security light is flashing or is steady on.. if it is flashing you just have ti reset the security by turning the key to the on posistiona and wait about 10 - 15minutes and let the pass lock reset.. is it is steady on (no flashin):

a steady light means that you could have a Class 2 data circuit problem. It indicates that your "passward" from your key in the "passlock" is not getting sent to the (Vehicles Thieft Deterrent) thats inside your Vehicles Control Module. This shuts down your fuel log or injectors stopping the engine from starting. The vehicle might start, but then stalls after 4 sec or so.
It's like the vehicle thinks it's been stollen. That's too bad, if your light was flashing "and" your cycles were correct the car would have re-leaned the passward and started.
A problem could mean...but not limited to a open,shorted or grounded circuit....or a loose or open connector between these comunicating systems: SIP/PCM/VTD/VCM and perhaps the EBCM.
Security Insturment Panal
PCM - Passlock Control Module
VTD - Vehicle Theift Deterrent
VCM- Vehicle Control Module
EBCM - E Brake Control Module

you may have to have the dealer check and replace / but instead of passlock system you may have the Passkey 3+ system

Posted on Mar 07, 2009

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