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Cadillac ATS Technical Discussion Forum Discussion, Trembling at idle in Cadillac ATS Discussion Forums; I had the ECM update performed last week and no hiccups so far. I'll let you know if they return......
  1. #136
    probee773 is offline Cadillac Owners Member
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    Re: Trembling at idle

    I had the ECM update performed last week and no hiccups so far. I'll let you know if they return...

  2. #137
    bravnik is offline Cadillac Owners Fanatic
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    Re: Trembling at idle

    I can say that my car idles a hell of a lot better after my oil change. I had it done at 1k miles as I never like my car to go too long with the original oil in it. Old school I know but it has not failed me yet. I noticed a vast improvement in overall smoothness. However, that could just be a placebo effect. Time will tell.

  3. #138
    aselvan's Avatar
    aselvan is offline Cadillac Owners Member
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    Re: Trembling at idle

    Quote Originally Posted by Dave623 View Post
    @cathycpc -- thanks for the info. My dealer hasn't exactly been a wealth of knowledge when it comes to the ATS.
    @Dave623 -- no kidding about the dealer, looks like we purchased the car from the same dealer

    @cathycpc -- can you kindly to post the details of the update so I can go to my dealer and request them to perform the same ECM update? It would be great to show the exact work order line item description from your invoice that will help them. Not sure ECM firmware is same since yours is 2.0T and mine is V6 but I have the same identical issue and hoping that there will be a update for my ECM as well.

  4. #139
    Dave623 is offline Cadillac Owners Member
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    Re: Trembling at idle

    Would you believe I still can't get a firm answer on which engine the idle calibration update is for? This issue has been reported with all three engines and it would be nice if it was finally put to rest -- six months of shaking is enough. Perhaps one of the Caddy Customer Service folks who frequent the forum can do some investigating?

  5. #140
    aselvan's Avatar
    aselvan is offline Cadillac Owners Member
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    Re: Trembling at idle

    Quote Originally Posted by Dave623 View Post
    Would you believe I still can't get a firm answer on which engine the idle calibration update is for? This issue has been reported with all three engines and it would be nice if it was finally put to rest -- six months of shaking is enough. Perhaps one of the Caddy Customer Service folks who frequent the forum can do some investigating?
    For me it is close to 3 months and I am tired of it. My dealer and the GM district support specialist I spoke with keep saying its harmless. I am not an auto mechanic, but I am afraid that it may be damaging the motor mounds with this constant shaking. You are correct, it is reported on all engines. Based on various posts here and here it is definitely on V4 turbo and V6 engines for sure. Pretty much most if not all V6 have this problem but the effect is not as dramatic as some of the V4 owners reported. According to one post here, it may be as a result of very aggressive idle tuning (very low rpm at idle?) by GM/Cadillac to squeeze out most mileage. It sounds like they could be right...my car idles around 450-500 rpm (it is approximate but I am going to measure with OBDII accurately over this weekend). After some google search, it appears that passenger car idle rpm should be between 600-1000 depending on engine type so definitely this is low and could be the reason.

  6. #141
    Dave623 is offline Cadillac Owners Member
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    Re: Trembling at idle

    @aselvan -- With my 2.5 engine, the tremble, since day one, has been light to moderate. In the past month, it kicked up enough to cause a stall on three occasions. Idle is around 700 rpm routinely and the shaking even occurs when first starting the car and idle's around 1000 rpm. On the other side of the coin, there are times when the idle is around 500 rpm and it's smooth as silk.
    This issue does not create any computer codes and my dealer's response to every issue I've had since last December (and still
    occurs) is "we need a code" and/or "we can't do anything if we can't reproduce the problem". It's getting very old.

  7. #142
    MASCAD is offline Cadillac Owners Member
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    Re: Trembling at idle

    " Pretty much most if not all V6 have this problem "

    Not sure about that! Mine could hardly be smoother and the same for the CTS that was traded in.

  8. #143
    bluecrayon is offline Cadillac Owners Fanatic
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    Wow I thought I was also just being picky, the other day I noticed my seat moving when I take turns, turning out after reading on here that many people have the same problem...... Then recently noticed just a bit of a stumble at idle especially when cold and, once again, upon reading here, many people seem to have had the same issues! Admittedly I did not read all posts in thread, but has anyone mentioned stretched timing chain?? Someone I know who works for gm told me these engines have had a problem with timing chains that first shows up as rough idle and may show a misfire code. I dont know about you guys but for a $50,000 car, I expect it to idle smooth as glass and my seat to be solid as a rock!

  9. #144
    Dave623 is offline Cadillac Owners Member
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    Re: Trembling at idle

    @bluecrayon -- welcome to the party Problem is, the tremble has been reported with all three engines and even with a stall, there are no computer codes. And, the degree of tremble is all over the place. Lots of people don't have it at all. There is an SPS update for idle calibration for the turbo (my dealer says it's for the 6 cylinder). So far, nothing for the 2.5 engine. BTW -- I've now stalled four times and this coupled with numerous on-going electrical issues, I sent an email to Cadillac this afternoon requesting a field engineer. Bottom line -- after six months and a clueless service department, I want the car fixed or replaced.

  10. #145
    bluecrayon is offline Cadillac Owners Fanatic
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    Ha thanks! Yeah I'm sorry to hear people are having these problems with a high end car such as this. I guess any new model will have similar growing pains.

  11. #146
    cathycpc is offline Cadillac Owners Member
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    Re: Trembling at idle

    Dave623,

    My service writer keeps telling me that all four cylinders do that. He is also trying to tell me that if it did't throw a code, it's not happening.

    Cathycpc

  12. #147
    Dave623 is offline Cadillac Owners Member
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    Re: Trembling at idle

    If this issue "was normal" for a 4 cylinder, there wouldn't be a technical service bulletin out, nor would that explain why some
    ATS's do not have the issue and others have it ranging from mild to severe. Sounds like your dealer is like mine. I appreciate
    the fact that the ATS is a new animal and will have gremlins. But, one would think, with all Cadillac has riding on this vehicle
    and their public relations image, they'd bend over backwards to get things fixed. BTW, Cadillac Customer Assistance just called me. My six months' worth of electrical issues and the worsening tremble are now in the hands of a District Specialist. We'll see what happens.
    happens.

  13. #148
    aselvan's Avatar
    aselvan is offline Cadillac Owners Member
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    Re: Trembling at idle

    Quote Originally Posted by Dave623 View Post
    If this issue "was normal" for a 4 cylinder, there wouldn't be a technical service bulletin out, nor would that explain why some
    ATS's do not have the issue and others have it ranging from mild to severe. Sounds like your dealer is like mine. I appreciate
    the fact that the ATS is a new animal and will have gremlins. But, one would think, with all Cadillac has riding on this vehicle
    and their public relations image, they'd bend over backwards to get things fixed. BTW, Cadillac Customer Assistance just called me. My six months' worth of electrical issues and the worsening tremble are now in the hands of a District Specialist. We'll see what happens.
    happens.
    I am working with a district specialist as well for the past several weeks. According to them, GM keeps telling them its 'normal' and they are echoing back the same to me ... it is frustrating. They insist that I take my car to the dealer who keeps telling me there is no fix. [I am taking it anyway this week, but pretty sure I am going to get the same response].

    I am just wondering since there are enough of us with this problem, is there anything we all can do collectively to take this w/ GM directly instead of working with your respective dealers who seem to be clueless? Luckily for me, this is not as bad as some of you but still makes me very mad --- we are talking about $40K+ car here not low end.

    Other than this problem and few CUE issues, I love this car and it is so awesome to drive this!

    ----------

    Quote Originally Posted by probee773 View Post
    I had the ECM update performed last week and no hiccups so far. I'll let you know if they return...
    @probee773 can you please share the details of this ECM update? Is your ATS 4T or V6?
    Thanks

  14. #149
    Dave623 is offline Cadillac Owners Member
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    Re: Trembling at idle

    @aselvan -- does GM think we're idiots? TSB's are not issued for something that is normal. There's a TSB for the tremble --
    it is not normal. If enough people file complaints with the NHTSA, it could potentially lead to a recall and I don't think GM would
    want that for 'the car of the year'.

    I got Caddy involved because of electrical issues since day one. Yesterday, after six months, I was able to duplicate one of the
    issues for my service consultant and a tech even managed to duplicate it. They still have no idea of what's going on with my
    ATS. And now, they're even telling me the Powertrain Control Module is shutting down and losing memory and I don't have any
    powertrain issues and that has nothing to do with the electrical issues. It's going to come down to a field engineer who will
    either find the problems and fix the car or authorize a swap or buy-back. I love the car but I'm totally fed up. Not a good
    first Cadillac experience.

  15. #150
    Cadillac Cust Svc's Avatar
    Cadillac Cust Svc is offline Cadillac Customer Service
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    Re: Trembling at idle

    Hi All,

    I am sorry your ATS vehicles are experiencing a trembling issue. I understand how you can be frustrated with this situation. If anyone would like me to look into their case number for them, or discuss their concerns, please private message me.

    Sincerely,

    Laura M.
    Cadillac Customer Service

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