Car won't start, sometimes
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Cadillac STS Forum - 2005 through 2012 Discussion, Car won't start, sometimes in Past Cadillac Vehicle Discussion; Been a while since I posted, meaning my STS has been running fine. But...I do have a problem. Occasionally, getting ...
  1. #1
    No Quarter's Avatar
    No Quarter is offline Cadillac Owners Member
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    Car won't start, sometimes

    Been a while since I posted, meaning my STS has been running fine. But...I do have a problem.

    Occasionally, getting more frequent, it won't start. I enter, foot on brake, key in pocket, press Start, everything lights up as it should, but starter does not engage. When that happens, I can't start it at all even if I try buttons on remote, go out and in, etc.. The only thing that works is disconnecting the battery a few seconds. When I reconnect, the alarm sounds, I push Unlock on remote, go in and the car starts.

    So I've not been stranded, but it's annoying of course.

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    mIAn is offline Cadillac Owners Member
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    Re: Car won't start, sometimes

    I think thats the only solution you got

  4. #3
    carter's_sts is offline Cadillac Owners Connoisseur
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    Re: Car won't start, sometimes

    Unfortunately / fortunately it will probably start to get worse. Hopefully that will make diagnosis easier.

  5. #4
    EChas3's Avatar
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    Re: Car won't start, sometimes

    Get the battery load tested.

  6. #5
    No Quarter's Avatar
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    Re: Car won't start, sometimes

    Happened again, is getting more frequent. When it starts, no sign of bad battery, starter runs fast.

  7. #6
    Dino1SG is offline Cadillac Owners Member
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    Possibly a bad starter solenoid...?

  8. #7
    dannyquest is offline Cadillac Owners Fanatic
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    Re: Car won't start, sometimes

    How old is your battery. You know these car likes to have new battery. Danny

  9. #8
    REALTORBENJAMIN's Avatar
    REALTORBENJAMIN is offline Cadillac Owners Fanatic
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    Corrosion on the leads to the battery? My Oldsmobile aurora did that until finally it died. Lift the rear seat where the battery was and one of the leads to the battery was corroded completely off.

  10. #9
    No Quarter's Avatar
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    Re: Car won't start, sometimes

    Keeps getting worse, can always start it by removing and reinstalling battery lead. I had the car at GM dealer, they didn't do much good, endedup just putting new batteries in remotes, at $100. Problem is still there.

  11. #10
    EChas3's Avatar
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    Re: Car won't start, sometimes

    Get your battery load tested and clean both ends of the cables.

  12. #11
    acs1784 is offline Cadillac Owners Member
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    Re: Car won't start, sometimes


  13. #12
    targetSTS is online now Cadillac Owners Fanatic
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    This problem concern to export models in common.
    The problem - one or more modules in car are dying.
    As usually it's column lock module and front doors modules.
    Get the car to a good electrician or gm service or you will not be able to start the car at all soon.

  14. #13
    No Quarter's Avatar
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    Re: Car won't start, sometimes

    Actually, I get the text steering column lock after I reconnect the battery, but as I said, I can start and drive. Is that a module I can replace? As I've stated, the local GM service is useless...

  15. #14
    shameka is offline Cadillac Owners Member
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    Re: Car won't start, sometimes

    I had this issue. It was the ECM.

  16. #15
    No Quarter's Avatar
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    Re: Car won't start, sometimes

    Today I wanted to eliminate some possibilities. So I checked all connections, cleaned most of them. To check the battery I put a new battery in the trunk and cables to use next time it wouldn't start. I also wanted to put a jumper wire from starter relay to the plus on the battery to check the starter. I couldn't find space enough, but saw it was a thick purple wire. Found it in the fuse/relay box. And put a jumper wire in the trunk. So ready for next time

    Next time was later in the day. So I pulled the extra battery from the trunk and connected. No start. Then I put the jumper wire from the battery to the purple wire, and the engine started. I could do that repeatedly as long as the car had the keys inside (I guess), but I still couldn't start using the Start button. Only when I at the end disconnected the battery and reconnected could I start with the Start button

    So my conclusions, feel free to disagree:
    -Battery is OK
    -Starter is OK
    -The key and/or Start button apparently engages the ignition, or the engine couldn't start

    Strange. Actually I might just pull a wire to the driver position where I can push a switch that connects the purple wire to plus. Strange that theft prevention is that easy to work around?

    Does anyone know if the immobiliser thing is supposed to hinder both engine turning and ignition? If yes, the Start works, just not on the starter. If no, the Start doesn't work at all until battery disconnected/reconnected.

    Did I get closer to fixing this? I'm not sure... I know it's not the battery. I think it's not the starter. I say "think", because even when I started the car using with a jumper to the purple wire, it took ½-1 second, maybe the relay is moving slow due to resistance, and the more direct current I get when using the jumper does the trick. On the other hand, everytime I disconnect/reconnect, it starts right up, why would that make a difference if it's just the relay?

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