2005 STS won't start
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Cadillac STS Forum - 2005 through 2012 Discussion, 2005 STS won't start in Past Cadillac Vehicle Discussion; I let my 2005 STS sit without being started for over a month while being on mission. I went to ...
  1. #1
    anthonyhall is offline Cadillac Owners Member
    Automobile(s): 2005 STS
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    2005 STS won't start

    I let my 2005 STS sit without being started for over a month while being on mission. I went to start it yesterday and it wouldn't. Has anyone else ever had this problem?

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  3. #2
    KRSTS is offline Cadillac Owners Enthusiast
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    Re: 2005 STS won't start

    Should always put on a trickle charger when leaving for a week or more. These cars drain batteries if left undriven for a while.

  4. #3
    anthonyhall is offline Cadillac Owners Member
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    Re: 2005 STS won't start

    Thanks KRSTS....so do I need to let it sit on a charger for a while or replace the battery?

  5. #4
    KRSTS is offline Cadillac Owners Enthusiast
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    Re: 2005 STS won't start

    Depends on how old the battery is. I wouldn't replace it just yet unless it the original Delco or is close to four years old. First fully charge on a charger and then take it to Advance or Firestone and have them load test it. If it doesn't have a bad cell, don't worry about it. If it happens again, replace it. I favor Firestone beacause they carry an Interstate battery that is an exact fit. I wouldn't buy an Delco.

  6. #5
    anthonyhall is offline Cadillac Owners Member
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    Re: 2005 STS won't start

    Took it to Auto Zone and had it charged.....still won't start. I don't know what to do. When i attempt to statr it i hear a click and then the dash just goes blank. I have never had any problems with my ride.

  7. #6
    KRSTS is offline Cadillac Owners Enthusiast
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    Re: 2005 STS won't start

    Did they do a load test at Autozone? Even if it tested OK, it still could be the battery. These cars are very particular about the battery. Do the headlights work and are they bright. If so, sound like a possible short in the starting system. I would still rule out the battery first. Good luck.

  8. #7
    anthonyhall is offline Cadillac Owners Member
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    Re: 2005 STS won't start

    I don't know if they did the load test. Yes the headlights do come on and they r bright.

  9. #8
    anthonyhall is offline Cadillac Owners Member
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    Re: 2005 STS won't start

    Replaced the battery today....still doing the same thing, so I'm thinking that it's the starter now.

  10. #9
    Ludacrisvp's Avatar
    Ludacrisvp is offline Cadillac Owners Connoisseur
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    Corrosion can be a killer. Clean the battery terminals and cables, check the relay center under the hood to see if there is corrosion on those cables as well. Just a little bit of it caused starting issues with my 02 DTS. Starter isn't cheap or easy on the northstar and I hear they rarely go out since they are so protected due to their location.

  11. #10
    EChas3's Avatar
    EChas3 is offline Cadillac Owners Master
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    Re: 2005 STS won't start

    Isn't the starter in the 'V' between the left and right cylinder banks?

    The problem is that corrosion isn't limited to the cable ends that connect to the battery.

  12. #11
    1BadCadSTS's Avatar
    1BadCadSTS is offline Cadillac Owners Connoisseur
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    Correct. It mounts under the intake manifold between the cyl heads.

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