Knocking sound when the car warms up ( driving me crazy)
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2008-2013 Cadillac CTS General Discussion Discussion, Knocking sound when the car warms up ( driving me crazy) in Cadillac CTS Second Generation Forum - 2008-2013; Ok so every morning when I warm up my car with in the frist 20 minutes I hear a knocking ...
  1. #1
    BeEasyBoi is offline Cadillac Owners Member
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    Question Knocking sound when the car warms up ( driving me crazy)

    Ok so every morning when I warm up my car with in the frist 20 minutes I hear a knocking sound coming from the back, at first I thought some one was in my trunk ( and yes I checked and no one was in there......hahahaha jokes on me). But now it's to the point that it's getting on my nerves at the same time it's as if my car is telling me hey I'm warmed up now and ready to go. I'm just curious has anyone else experience this or is this a normal thing for the CTS 2010 model 3.6-liter V6?

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    dan87951's Avatar
    dan87951 is offline Cadillac Owners Fanatic
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    Re: Knocking sound when the car warms up ( driving me crazy)

    Definitely not normal! I wonder if you have a CV joint going bad? This noise is only heard when moving correct? Does it get louder depending on which way you turn the car?

  4. #3
    BeEasyBoi is offline Cadillac Owners Member
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    Re: Knocking sound when the car warms up ( driving me crazy)

    Dan I only hear it when I turn the car on after it has been sitting for some time, it does not matter if the wearther is cold of hot. Once the car is warm you hear 2 knocks and that's it, other than that no knocking sound while I'm driving. It's been like that since I first purchased it back in Nov. of last year.

  5. #4
    ltdltc's Avatar
    ltdltc is offline Cadillac Owners Fanatic
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    Re: Knocking sound when the car warms up ( driving me crazy)

    Both of my 2006 DTS's did this. It's the EVAP purge solenoid purging the system or something to that affect. There is a TSB about it that explains that it is normal and if the customer still isn't satisfied to replace solenoid.

    I'm betting that is what your hearing. I was never bothered by the noise after reading the TSB so I lived with it. I've only had my 2010 CTS for little over 3 weeks now and have never heard the sound.

  6. #5
    BeEasyBoi is offline Cadillac Owners Member
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    Re: Knocking sound when the car warms up ( driving me crazy)

    thank you at least I know now it's nothing major, I just had to know what the sound was and if I was the only person hearing it.

  7. #6
    Cadillac Cust Svc's Avatar
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    Re: Knocking sound when the car warms up ( driving me crazy)

    Hello BeEasyBoi,

    I understand the knocking noise you hear upon warming up your vehicle can be disheartening. I am glad to see forum members provided insight to your situation. If this is something you would like your local dealership to look into, or if you have any additional questions, please feel free to send me a private message.

    Sincerely,

    Laura M.
    Cadillac Customer Care

  8. #7
    Joe
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    Re: Knocking sound when the car warms up ( driving me crazy)

    Hi,

    These engines run very rich when started to warm up the CATS. Mine does it also and that's the way it was explained to me; true or false I don't know. I don't pay much attention to it anymore thankfully it's not a piston slap or crank bearing.

    Happy Motoring

  9. #8
    BeEasyBoi is offline Cadillac Owners Member
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    Re: Knocking sound when the car warms up ( driving me crazy)

    thank you for everyone replies, sorry for getting back with you so late just got back in town from taking the CTS on it's first road trip and I must say I'm very impressed.

  10. #9
    Panzer Leader's Avatar
    Panzer Leader is offline Cadillac Owners Enthusiast
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    Re: Knocking sound when the car warms up ( driving me crazy)

    I had a similar problem on my G8.....

  11. #10
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    Re: Knocking sound when the car warms up ( driving me crazy)

    Hi BeEasyBoi,

    I am glad to hear your first road trip with your CTS was a great experience! Continue to enjoy your ride and if you ever have any questions, don't hesitate to reach out to us for assistance.

    Regards,

    Laura M.
    Cadillac Customer Care

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