Speed limited to 120mph
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Page 1 of 5 1 2 3 4 5 LastLast
Results 1 to 15 of 71
Like Tree1Likes
Cadillac STS Forum - 2005 through 2012 Discussion, Speed limited to 120mph in Past Cadillac Vehicle Discussion; Yesterday while driving home for a brief second the DIC flashed the message for speed limited to 120mph. There was ...
  1. #1
    Ludacrisvp's Avatar
    Ludacrisvp is offline Cadillac Owners Connoisseur
    Automobile(s): 08 STS4 V8 F55 1SG Euro tails & 01 Monte SS Pace Car
    Join Date
    Feb 2009
    Location
    St Michael, MN
    Age
    27
    Posts
    3,328

    Speed limited to 120mph

    Yesterday while driving home for a brief second the DIC flashed the message for speed limited to 120mph. There was no warning noise or any other dash messages. Am I correct in assuming that this was due to something suspension related? Only saw it once and barely had time to read it before it disappeared.

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    curtc's Avatar
    curtc is online now OCD - Obsessive Cadillac Disorder
    Automobile(s): White Diamond 06 STS V8 RWD 1SF F55 HUD/ACC NAV - 130k
    Join Date
    Jul 2005
    Location
    Burnsville, MN
    Age
    29
    Posts
    5,557
    Yes, speed limited messages are always associated with a suspension issue...
    Past Cadillac's

    2004 CTS 3.6L - 2011-2012
    2001 Seville Touring Sedan - 2006-2011
    1995 Seville Touring Sedan - 2005-2006

  4. #3
    Ludacrisvp's Avatar
    Ludacrisvp is offline Cadillac Owners Connoisseur
    Automobile(s): 08 STS4 V8 F55 1SG Euro tails & 01 Monte SS Pace Car
    Join Date
    Feb 2009
    Location
    St Michael, MN
    Age
    27
    Posts
    3,328
    Hmm. I guess this would explain why I was only able to hit 120 when the car silently decided to stop accelerating about 2 weeks ago when I had a chance to test it out. No DIC message at all before or during, it just stopped accelerating. It did not act like the DTS I had when hitting the top speed fuel cutoff. So I can only surmise that there is a suspension issue. Hopefully the service contract covers suspension related issues.

  5. #4
    1BadCadSTS's Avatar
    1BadCadSTS is offline Cadillac Owners Connoisseur
    Automobile(s): 05 STS4
    Join Date
    Nov 2010
    Posts
    3,681
    Love to see the work order ahhaa. Customer states car cannot speed in access of 120 mph... Hahah
    SsSTS88 likes this.

  6. #5
    Ludacrisvp's Avatar
    Ludacrisvp is offline Cadillac Owners Connoisseur
    Automobile(s): 08 STS4 V8 F55 1SG Euro tails & 01 Monte SS Pace Car
    Join Date
    Feb 2009
    Location
    St Michael, MN
    Age
    27
    Posts
    3,328
    Lol. I don't know if I will have it worded quite like that.

  7. #6
    curtc's Avatar
    curtc is online now OCD - Obsessive Cadillac Disorder
    Automobile(s): White Diamond 06 STS V8 RWD 1SF F55 HUD/ACC NAV - 130k
    Join Date
    Jul 2005
    Location
    Burnsville, MN
    Age
    29
    Posts
    5,557
    Quote Originally Posted by 1BadCadSTS
    Love to see the work order ahhaa. Customer states car cannot speed in access of 120 mph... Hahah
    Hahaha!
    Past Cadillac's

    2004 CTS 3.6L - 2011-2012
    2001 Seville Touring Sedan - 2006-2011
    1995 Seville Touring Sedan - 2005-2006

  8. #7
    Ludacrisvp's Avatar
    Ludacrisvp is offline Cadillac Owners Connoisseur
    Automobile(s): 08 STS4 V8 F55 1SG Euro tails & 01 Monte SS Pace Car
    Join Date
    Feb 2009
    Location
    St Michael, MN
    Age
    27
    Posts
    3,328
    Took it to the dealer a week or so ago to have some work done and had them look into this.
    They have never heard of such a message on the DIC. They could find no codes related to suspension or otherwise on the car using the tech 2. They claimed to have called GM tech assistance to see if they knew anything about it and they didn't either. :suspicious:
    So ideas on what's up with my F55 FE3 suspension?
    It does silently top out at 120mph with NO message showing on the DIC, when hitting 120 it's like I just set the cruise, it does not behave like the top speed file cutoff that I had in the DTS.
    Speed limited message is the only one I have seen on this car and it was only the one time but the speed is limited all the time.

    Edit: according to alldata this should leave a code in the ESC module.

    Electronic Suspension Control Operation

    The electronic suspension control (ESC) system uses the information from other systems in order to execute certain functions.

    The ESC system does not have a malfunction indicator lamp, but instead uses the instrument panel cluster (IPC) for the display functions. When the ESC system detects a malfunction that sets a DTC, the ESC system sends a message on the serial data line directly or through the powertrain control module (PCM) to the IPC, which will display one of the following messages:

    SHOCKS INOPERATIVE
    SERVICE SUSPENSION SYSTEM
    SPEED LIMITED
    The SHOCKS INOPERATIVE message will only be displayed if the ESC system detects a malfunction that sets a DTC and causes the ESC system to disable all 4 shock absorbers. The ESC system will send a message on the serial data line to the IPC to display this message.

    The SERVICE SUSPENSION SYSTEM message will only be displayed if the ESC system detects any malfunction that sets a DTC. The ESC system will send a message on the serial data line to the IPC to display this message.

    The SPEED LIMITED message will only be displayed if the ESC system detects a malfunction that sets a DTC and causes the ESC system to disable all 4 shock absorbers. The ESC system will send a message on the serial data line to the PCM indicating that all 4 shock absorbers were disabled. The PCM then sends a message to the IPC to display this message.

    The ESC module has the ability to store DTCs as current or history codes. Most ESC system malfunctions will display a message in the IPC and set a DTC. The message will remain ON until the RESET button is pressed on the driver information center (DIC). As long as the DTC is current, the message will be displayed after every ignition cycle and the RESET button must be pressed to bypass the message.

    The ESC system uses an ignition cycling diagnostic approach in order to reduce the occurrence of false or intermittent DTCs that do not affect the functionality of the ESC system. This allows for the fail-soft actions to be taken whenever a malfunction condition is current, but requires the malfunction to be current for a certain number of ignition cycles before the corresponding malfunction code and message will be stored or displayed.

    If the ESC detects a malfunction, the ESC system defaults with a fail-soft action. A fail-soft action refers to any specific action the ESC system takes in order to compensate for a detected malfunction. A typical ESC fail-soft action would be if the ESC system detects a malfunction with a shock absorber.

  9. #8
    1BadCadSTS's Avatar
    1BadCadSTS is offline Cadillac Owners Connoisseur
    Automobile(s): 05 STS4
    Join Date
    Nov 2010
    Posts
    3,681
    Askm to throw it on a lift and romp it up to 120 (assumin awd it should do it without issues on wheel speed abs and tc) and explain why it stops then.

  10. #9
    Ludacrisvp's Avatar
    Ludacrisvp is offline Cadillac Owners Connoisseur
    Automobile(s): 08 STS4 V8 F55 1SG Euro tails & 01 Monte SS Pace Car
    Join Date
    Feb 2009
    Location
    St Michael, MN
    Age
    27
    Posts
    3,328
    I recall people on the deville / Seville forum overriding suspension messages when they replaced active suspension shocks with passive ones... Does this sound like that behavior to anyone? (Could previous owner have done a resistor mod to cause this behavior??)
    I may have to stop in on Monday and have them use the tech 2 in front of me and check out the ESC module.
    Not sure if the dealer would want to take responsibility for possible drivetrain damage cranking it up to 120+mph on a lift. It is AWD but getting the drivetrain going that fast with no resistance on the components nor the added cooling of the high wind speed at that rate may not be a great idea.

  11. #10
    1BadCadSTS's Avatar
    1BadCadSTS is offline Cadillac Owners Connoisseur
    Automobile(s): 05 STS4
    Join Date
    Nov 2010
    Posts
    3,681
    Is no resistor mod for f55 also no replacement other than oem.

  12. #11
    KRSTS is offline Cadillac Owners Enthusiast
    Automobile(s): Crystal Red 2008 3.6 DI RWD
    Join Date
    Feb 2010
    Location
    Tidewater VA
    Age
    72
    Posts
    966

    Re: Speed limited to 120mph

    Quote Originally Posted by Ludacrisvp View Post
    Yesterday while driving home for a brief second the DIC flashed the message for speed limited to 120mph. There was no warning noise or any other dash messages. Am I correct in assuming that this was due to something suspension related? Only saw it once and barely had time to read it before it disappeared.
    Rental fleet vehicle

  13. #12
    Ludacrisvp's Avatar
    Ludacrisvp is offline Cadillac Owners Connoisseur
    Automobile(s): 08 STS4 V8 F55 1SG Euro tails & 01 Monte SS Pace Car
    Join Date
    Feb 2009
    Location
    St Michael, MN
    Age
    27
    Posts
    3,328
    Doesn't have any history of that at least no RPO code that suggests it. It comes with the VR rated tires according to the door sticker. It does _NOT_ say that I have reached the speed limiter.

  14. #13
    MacMuse's Avatar
    MacMuse is offline Moderator
    Automobile(s): 2006 STS N* 1SE
    Join Date
    Feb 2009
    Location
    Chicagoland
    Age
    52
    Posts
    2,400
    Check the RPO codes on the spare tire cover in the trunk. You may get a different story on what tires were installed by the factory. Factory sets the limiter at build time based on the tires scheduled to be installed on the car.

    Fleet cars were commonly set to a 108 limiter with 112 speed rated tires mounted. Mine had the, presumably cheaper, 112 rated 235/50R17 Michelins factory mounted. That's right, not the staggered setup normally used on the STS. I've seen the limiter message on the occasional deserted country road.

    A sensor or hub issue could cause faulty alerts resulting in the limiter message. But since your not seeing a message... hmmm

  15. #14
    Ludacrisvp's Avatar
    Ludacrisvp is offline Cadillac Owners Connoisseur
    Automobile(s): 08 STS4 V8 F55 1SG Euro tails & 01 Monte SS Pace Car
    Join Date
    Feb 2009
    Location
    St Michael, MN
    Age
    27
    Posts
    3,328

    Re: Speed limited to 120mph

    Quote Originally Posted by MacMuse View Post
    Check the RPO codes on the spare tire cover in the trunk. You may get a different story on what tires were installed by the factory. Factory sets the limiter at build time based on the tires scheduled to be installed on the car.
    Fleet cars were commonly set to a 108 limiter with 112 speed rated tires mounted. Mine had the, presumably cheaper, 112 rated 235/50R17 Michelins factory mounted. That's right, not the staggered setup normally used on the STS. I've seen the limiter message on the occasional deserted country road.
    Hopefully this will help out...



    Tire Rack shows ZR W rated tires at being 168MPH rating.
    Note that Tire Rack shows the STS V8 AWD as having non staggered setup of 255/45-18 for the "Performance Handling Package"
    The only other option is a staggered setup for "17 inch OE wheels" which has sizes of 235/50-17 front and 255/45-18 rear ... wtf?
    But if you choose the V6 AWD model you get 235/50-18 & 255/45-18



    Quote Originally Posted by 1BadCadSTS
    Love to see the work order ahhaa. Customer states car cannot speed in access of 120 mph... Hahah
    Service Manager accidentally put 130MPH, rather than the actual 120MPH speed.
    The code they listed is related to excessive braking, found myself needing to avoid a Deer in the road during a time of the year we don't normally see any.
    They cleared the code anyways and it didn't help with the speed limiter.
    When this code that is listed is a 'current' code it disables the Cruise Control system as to avoid applying any additional heat onto the brake system.

    I do have a service contract on this car that is of the short exclusion list type, rather than the crappy inclusion list type.

  16. #15
    Mrsanders3960 is offline Cadillac Owners Member
    Automobile(s): 2008 STS
    Join Date
    Jun 2012
    Location
    Euless, TX
    Posts
    24

    Re: Speed limited to 120mph

    I have a Silly Question, Were you driving 120 MPH? Kidding: I have an 08 STS Platinum edition and took it to a track day here at Texas Motor Speedway. It is limited at 120 and flashes the message on the DIC. If you were not in warp 2.5 at that time, I'd recommend having it checked out at your dealer...

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting