Anti-theft system

Asked by MrsMiller19 Feb 04, 2020 at 07:14 AM about the 2002 Cadillac DeVille Sedan FWD

Question type: Maintenance & Repair

I had to replace the alternator in my 2002
Cadillac deville. It won't start now. It says
service theft system. I have tried multiple
things to do this sometimes it starts but
when it does the dashboard and everything
goes crazy when I try to drive it and it feels
like it's going to stall out. when I try to start it
again it won't start. Still says service theft
system. How do I do this?

1 Answer
103,435

KenF answered 4 years ago

Could be a bad ECU. Diagnosing bad computer modules is usually beyond DIYers, have a shop look at it, if it is a bad ECU you may be able to buy a preprogrammed one online. Try looking up symptoms for a bad ECU or anti theft module and see if they match what is happening with yours.

Mark helpful

Your Answer:

Related Questions

  • Anti-theft system 1 Answer

    I had to replace the alternator in my 2002 Cadillac deville. It won't start now. It says service theft system. I have tried multiple things to do this sometimes it starts but when it does the dash...

    2002 Cadillac DeVille Sedan FWD

    -

    Maintenance & Repair

  • how to get anti theft system to work 3 Answers

    anti theft system is not working how do I fix it

    2002 Cadillac DeVille Sedan FWD

    -

    Maintenance & Repair

  • Anti theft 1 Answer

    I have an 03deville my tumbler fell apart and I had to leave it to get to work.when my brother got there it was about to be towed.he busted the key switch to unlock and move it before it got towed....

    2003 Cadillac DeVille Sedan FWD

    -

    Maintenance & Repair

  • How to reset theft system 2 Answers

    Theft system problem car wont start

    1998 Cadillac DeVille Sedan FWD

    -

    Maintenance & Repair

  • Disable anti theft in 02 Cadillac deville 2 Answers

    I am trying to install an aftermarket stereo deck in my 02 Cadillac Deville, but the anti theft system shuts my vehicle down. The stock stereo has been disposed of already. My question is ... is th...

    2002 Cadillac DeVille

    -

    Maintenance & Repair

Shortcuts

Search Cadillac DeVille Questions

CarGurus Experts

  • #1
    James Sparrow
    Reputation
    4,090
  • #2
    tuff4x4
    Reputation
    3,110
  • #3
    Cynthiasmith
    Reputation
    2,840
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Cadillac Eldorado
4 listings
Used Cadillac Seville
1 listing
Used Cadillac Escalade
15 Great Deals out of 427 listings starting at $9,995
Used Chevrolet Corvette
22 Great Deals out of 1,084 listings starting at $15,000
Used Cadillac CTS
6 Great Deals out of 55 listings starting at $4,888
Used Lincoln Continental
8 listings starting at $17,900
Used Chevrolet Impala
7 Great Deals out of 93 listings starting at $3,531
Used GMC Sierra 1500
132 Great Deals out of 6,515 listings starting at $3,975

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.