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Cadillac STS Forum - 2005 through 2012 Discussion, Speed limited to 120mph in Past Cadillac Vehicle Discussion; My '06 STS AWD has RPO Q11 tires P235/50R17 FRT and P255/45R1745R17 RR and RPO Q13 wheels 17/7.5 FRT and ...
  1. #16
    dkozloski's Avatar
    dkozloski is offline Cadillac Owners 10000+ Posts
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    Re: Speed limited to 120mph

    My '06 STS AWD has RPO Q11 tires P235/50R17 FRT and P255/45R1745R17 RR and RPO Q13 wheels 17/7.5 FRT and 17X8 RR
    Don't mess with Binky Bear!


  2. #17
    Ludacrisvp's Avatar
    Ludacrisvp is online now Cadillac Owners Connoisseur
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    Quote Originally Posted by Mrsanders3960 View Post
    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...
    The first time I saw the message I was pulling in my driveway at all of about 3mph.
    I did take it to the track and it just silently stops accelerating at 120mph. No messages of any kind just seemed like I got to 120 and engaged the cruise control. Didn't matter if I was in sport mode for shifting or performance mode for MRC each time I hit 120 it gently stopped at that speed. Not like the top speed fuel cutoff that feels like you punched a wall.

    Quote Originally Posted by dkozloski View Post
    My '06 STS AWD has RPO Q11 tires P235/50R17 FRT and P255/45R1745R17 RR and RPO Q13 wheels 17/7.5 FRT and 17X8 RR
    I see RPO Q12 on my list

    Q12 TIRE ALL P235/50R18 FRT & P255/45R18 RR TIRE

    Code:
    RPO	DESCRIPTION BUILD DATE: 2007-12-20
    A45	MEMORY SEAT ADJUSTER, MIRROR, POWER, DRIVER & ENHANCED MEMORY PERSONALIZATION MEMORY MIR AND ST ADJ(A45) MEMORY PACKAGE
    AL0	SENSOR INDICATOR INFLATABLE RESTRAINT, FRT PASS/CHILD PRESENCE DETECTOR FRT PASS/CHILD PRESENCE DETECTOR INFL REST IND SENSOR(AL0)
    AL2	CONTROL SEAT, POWER LUMBAR SEAT CTL,PWR LUMBAR(AL2) SEAT ADJUSTERS, 4-WAY POWER DRIVER AND FRONT PASSENGER LUMBAR CONTROL
    AP9	NET,CONVENIENCE CONVENIENCE NET(AP9) CARGO NET
    AQ9	SEAT,FRONT BUCKET,DRIVER,PASSENGER,RECLINING RECL FRT BKT ST,LUXURY(AQ9) SEATS, FRONT BUCKET
    AT8	RESTRAINT PROVISIONS CHILD, RR SEAT, RR FACING RR SEAT RR FACING CHILD RESTRAINT PROVISIONS(AT8) CHILD SEAT RESTRAINT SYSTEM
    AY0	RESTRAINT SYSTEM SEAT, INFLATABLE, DRIVER & PASS, FRT SIDE, ROOF SIDE DRVR & PASS FRT SIDE & ROOF INFLATABLE RESTRAINT(AY0) AIR BAGS, DUAL-STAGE FRONTAL AND SIDE-IMPACT, DRIVER AND RIGHT-FRONT PASSENGER AND HEAD CURTAIN SIDE-IMPACT, FRONT AND REAR OUTBOARD SEATING POSITION
    B20	ORNAMENTATION,INTERIOR(LUXURY) LUXURY INTR(B20) WOOD TRIM PACKAGE
    B9A	VEHICLE GM - PROD WEEK 51
    CE1	WIPER SYSTEM WINDSHIELD, PULSE, MOISTURE SENSITIVE W/S WPR,PULSE MOISTURE SENSITIVE(CE1) WIPERS, RAINSENSE
    CE4	WASHER,HEADLAMP,HIGH PRESSURE HDLP WA(CE4) HEADLAMP WASHER SYSTEM
    CF5	ROOF,SUN,GLASS SLIDING,ELECTRIC ELEC SUNROOF(GLASS)(CF5) SUNROOF, POWER
    CJ2	HVAC SYSTEM AIR CONDITIONER FRT, AUTO TEMP CONT, AUX TEMP CONT A/C FRT AUTO/AUX CONT(CJ2) CLIMATE CONTROL, DUAL-ZONE AUTOMATIC
    DCP	PROCESSING DIRECTIONS & CONNECTIONS SERVICE PACKAGE DIRECTIONS & CONNECTIONS SERVICE PKG(DCP)
    DD8	MIRROR,INSIDE,REARVIEW,TILT,AUTOMATIC,LIGHT SENSITIVE I/S RR VIEW MIR,LIGHT SENSITIVE(DD8) MIRROR, INSIDE REARVIEW AUTO-DIMMING
    DR2	MIRROR,OUTSIDE,LH & RH, REMOTE CONTROL,ELECTRIC, MANUAL FOLDING HEATED R/CONT HTD O/S MIR(DR2) MIRRORS, OUTSIDE HEATED POWER-ADJUSTABLE AND DRIVER-SIDE AUTO-DIMMING, BODY-COLOR
    F55	CHASSIS CONTINOUSLY VARIABLE REAL TIME DAMPING MAGNETO RHEOLOGICAL VARIABLE TIME DAMPING CHASSIS(F55) 
    FE3	SUSPENSION SYSTEM,SPORT SPORT SUSP(FE3) SUSPENSION, 4-WHEEL INDEPENDENT WITH MAGNETIC RIDE CONTROL
    FE9	FEDERAL EMISSION CERTIFICATION FED EMIS(FE9) EMISSIONS, FEDERAL REQUIREMENTS
    GU5	AXLE,REAR,3.23 RATIO 3.23R(GU5)
    IL3	TRIM,INTERIOR DESIGN (IL3)
    JE5	BRAKE SYSTEM PWR, ANTILOCK, FRT & RR WHL FRT & RR ANTILOCK BRK(JE5) BRAKES, PERFORMANCE 4-WHEEL ANTILOCK, 4-WHEEL DISC
    JJB	PT DRESS SUBASSEMBLY NOT INSTALLED (MODULAR OPTIMIZATION METHOD ONLY) PLANT OPERATION(JJB)
    JJD	I/P SUBASSEMBLY NOT INSTALLED (MODULAR OPTIMIZATION METHOD ONLY) PLANT OPERATION(JJD)
    JJL	SUSPENSION FRONT NOT INSTALLED (MODULAR OPTIMIZATION METHOD ONLY) PLANT OPERATION(JJL)
    JJM	SUSPENSION REAR NOT INSTALLED (MODULAR OPTIMIZATION METHOD ONLY) PLANT OPERATION(JJM)
    K59	CRUISE CONTROL AUTOMATIC ADAPTIVE ADAPTIVE CRUISE CONTROL(K59) ADAPTIVE CRUISE CONTROL
    KA6	HEATER,RR SEAT REAR SEAT HEATER(KA6) SEATS, HEATED REAR OUTBOARD SEATING POSITIONS
    KB6	HEATER SEAT, COOLING, FRT COOLING FRT ST HTR(KB6) SEATS, HEATED/VENTILATED DRIVER AND FRONT PASSENGER
    KG4	GENERATOR 150 AMP 150 AMP GEN(KG4)
    LH2	ENGINE GAS, 8 CYL, 4.6L/(281 CID), SFI, V8, DOHC, HO, ALUM, GM 4.6A(LH2) ENGINE, NORTHSTAR 4.6L VARIABLE VALVE TIMING V8 SFI
    MX7	MERCHANDISED TRANS AUTO PROVISIONS, O/D, AWD (ALL WHEEL DRIVE) AWD A/TRANS PROVISIONS(MX7) TRANSMISSION, 6-SPEED AUTOMATIC FOR AWD
    MYB	TRANSMISSION AUTO 6 SPD, HMD, 6L-50 6-SPD A/TRANS(MYB)
    N31	STEERING WHEEL HEATED HTD STRG WHL(N31) STEERING WHEEL, HEATED
    NT7	EMISSION SYSTEM FEDERAL, TIER 2 TIER 2 FED EMIS(NT7)
    NV7	STEERING,POWER,VARIABLE EFFORT P/S(VARIABLE)(NV7) PREMIUM STEERING GEAR, ZF
    P40	WHEEL 18 X 8, ALUMINUM, SPORT ALUM WHL(P40) WHEELS, 18" X 8" (45.7 CM X 20.3 CM) POLISHED CAST ALUMINUM
    PDV	V8 PERFORMANCE COLLECTION
    Q12	TIRE ALL P235/50R18 FRT & P255/45R18 RR TIRE(Q12)
    R6F	CONTROL - SALES ITEM NO. 06
    R8E	GAS GUZZLER TAX
    R9N	CONTROL - SALES ITEM NO. 89
    SLM	SALES PROCESSING - STOCK ORDERS
    T90	LAMP,SIGNALING AND MARKER(EXPORT) SIG & MKR LP(T90)
    TQ5	CONTROL INTELLIGENT HIGH BEAM INTELLIGENT HIGH BEAM CONTROL(TQ5) HEADLAMPS, INTELLIBEAM
    TT6	HEADLAMPS HIGH INTENSITY DISCHARGE HI INTENS DISCHARGE HDLP(TT6) HEADLAMPS, XENON, HIGH-INTENSITY DISCHARGE (HID)
    U2K	DIGITAL AUDIO SYSTEM S-BAND DIGITAL S-BAND AUDIO SYS(U2K) XM RADIO
    U30	CLUSTER INST, TACH, CLOCK CLUSTER(U30)
    UA6	THEFT DETERRENT SYSTEM ANTI-THEFT(UA6) THEFT-DETERRENT SYSTEM, VEHICLE, PASS-KEY III
    UE1	COMMUNICATION SYSTEM VEHICLE, G.P.S. 1 GPS 1 VEH COMM SYS(UE1) ONSTAR, 1-YEAR OF DIRECTIONS AND CONNECTIONS PLAN
    UFL	SENSOR INDICATOR LANE DEPARTURE WARNING LANE DEPARTURE WARNING IND(UFL) LANE DEPARTURE WARNING
    UFT	SENSOR INDICATOR SIDE OBSTACLE DETECTION SIDE OBSTACLE DETECTION SEN(UFT) SIDE BLIND ZONE ALERT
    UG1	OPENER GARAGE DOOR, UNIVERSAL UNIVERSAL GARAGE DR OPENER(UG1) UNIVERSAL HOME REMOTE
    UJ6	INDICATOR,LOW TIRE PRESS LOW TIRE PRESSURE IND(UJ6) TIRE PRESSURE MONITOR SYSTEM
    UV6	DISPLAY,HEADUP HEAD UP DISPLAY(UV6) HEAD-UP DISPLAY
    UY5	SPEAKER SYSTEM 15, DELUXE DELUXE SPKR SYS(UY5)
    V03	COOLING SYSTEM,EXTRA CAPACITY EXTRA CAPACITY CLG(V03) PERFORMANCE COOLING PACKAGE
    V4X	MODEL CONVERSION GMX295, STS V8 STS V8(V4X)
    V73	VEHICLE STATEMENT - US/CANADA US/CANADA VEHICLE STATEMENT(V73)
    VH9	ENVELOPE,OWNER INFORMATION MANUAL OWNER INFO MAN ENV(VH9)
    VT7	OWNERS MANUAL ENGLISH LANGUAGE ENGLISH LANGUAGE OWNERS MANUAL(VT7)
    Y53	SALES PACKAGE TECHNOLOGY DRIVER AWARENESS DRVR AWARENESS SALES PKG(Y53) DRIVER AWARENESS PACKAGE
    YQ4	INFOTAINMENT SYSTEM 012 INFOTAINMENT SYSTEM(YQ4) AUDIO SYSTEM WITH NAVIGATION, AM/FM STEREO WITH BOSE 5.1 STUDIO SURROUND SOUND SYSTEM, 6-DISC IN-DASH CD/DVD CHANGER AND DVD-BASED ADVANCED NAVIGATION
    323	TRIM COMBINATION LEATHER, MED DK CASHMERE (3) (04) (323) SEAT TRIM, PREMIUM TUSCANY ALL-LEATHER SEATS
    12U	EXTERIOR COLOR,PRIMARY (12U) PRIMARY COLOR EXTERIOR, DK BRAHMA JEWEL MET (12U)
    1SG	PACKAGE OPTION 07 OPTION PACKAGE 07 OPTION PACKAGE 07 (1SG)
    1SZ	PACKAGE OPTION- (1SZ) SALES DISCOUNT PACKAGE
    32I	INTERIOR TRIM MED DK CASHMERE (04) (32I)
    6SB	COMPONENT-COMPUTER SELECTED,SUSPENSION SUSP(6SB)
    7SB	COMPONENT-COMPUTER SELECTED,SUSPENSION SUSP(7SB)
    8XL	COMPONENT RR LH COMPUTER SEL SUSP(8XL) SUSP(8XL)
    9XL	COMPONENT RR RH COMPUTER SEL SUSP (9XL) SUSP(9XL)

  3. #18
    z06bigbird is offline Cadillac Owners Connoisseur
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    Re: Speed limited to 120mph

    Quote Originally Posted by 1BadCadSTS View Post
    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.
    Dealer will not do that. That high speed with no drag on the tires will likely cause the engine to come apart.

  4. #19
    Ludacrisvp's Avatar
    Ludacrisvp is online now Cadillac Owners Connoisseur
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    I've gone to 3 dealers and they all look at me like I'm speaking Greek and some act like I'm there to get the governor removed. I've checked twice with a GM dealer to pull codes and both times they find no codes. The caddy dealer that I stopped at said they would look at it (pull codes if any and look at the TSBs and possibly do some basic testing / re-seating electrical connectors on suspension) they quoted me about 1.5 hours at $145/hr. I walked out the door at that price, but they did have 5 sigma STS car on lifts in their service department that i could see and 1 pulled in behind me too passenger side mirror and housing was hanging from the electrics though so they likely know the STS better than the Chevy dealer I normally visit.
    I may consider going back there if I can get a code pulled that tells something but they didn't like the idea of a non GM service contract. I might have to try out the other caddy dealer near me but the history with them is about as good as the one I was at. I had them pull up the TSB for the 09-12 CTS-V with MRC that reports service suspension but doesn't leave a DTC behind that tells you how to do a suspension test with the tech 2 but they we're just like the CTS-V is such a completely different platform that there is no way that this TSB would apply at all. So likely whatever is wrong will never get fixed from a dealer. You start talking magnetic ride control at the dealer to the service guys an they Just have a glazed over look on their face, it's really irritating that dealers that should know their latest cars and options that they don't know what I'm talking about. Magnetic ride has been around since 2003 dealers should know it by now.

  5. #20
    curtc's Avatar
    curtc is online now OCD - Obsessive Cadillac Disorder
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    Hell, late 02 STS's were even equipped with F55...
    Past Cadillac's

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

  6. #21
    Ludacrisvp's Avatar
    Ludacrisvp is online now Cadillac Owners Connoisseur
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    For what it's worth I unplugged the front struts at the top of the tower and no DIC message came up. I don't get a DIC message until the device was pulled off of the strut and was plugged in. When it was in the state of nothing connected to the struts with the little device plugged in I get a persistent speed limited to 80 mph message on the DIC. I did have to pull battery cables to clear this message after restoring connections.

    Is there more than one cable per strut?
    Do I have to pull trunk liner to get access to the rear ones? Or where are they located? I have to wonder if perhaps one of them is not plugged in or has a poor connection since if they are unplugged the car doesn't verbally care about it.

  7. #22
    Ludacrisvp's Avatar
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    Quote Originally Posted by curtc View Post
    Hell, late 02 STS's were even equipped with F55...
    Figured I'd give them the extra half year since most people don't understand what a 2002.5 model year is. Likely of any service on them was needed it wasn't until 03 or later.

  8. #23
    1harleyman is offline Cadillac Owners Member
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    Re: Speed limited to 120mph

    When my '98 sts's rear shocks went out, I disconnected the senser and put on a set of gabrial air shocks and from then on my dash has always read do not exceed 90 mph so its probably the same problem, $80 vs $600. I can live with the message, ride is still good just no auto leveling

  9. #24
    Ludacrisvp's Avatar
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    Re: Speed limited to 120mph

    Update:

    Was changing out Fog Lamps (and as per service manual the proper method is remove wheel and wheel well liner) and discovered what I believe to be my issue.
    The front passenger shock looks like it may be leaking...














    Compared to the Driver's side:





    Will be visiting the dealer this week and hopefully this answers the random speed limited message.

  10. #25
    B1n2fra's Avatar
    B1n2fra is offline Cadillac Owners Fanatic
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    Mines randomly says speed limited to 155 sometimes. I'm not to worried about it knowing thats the cars top speed but I kinda do wanna know why that happens.

  11. #26
    DHspring is offline Cadillac Owners Member
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    Re: Speed limited to 120mph

    What a ripoff, I thought these cars were capable of 155 MPH, the V-8 NorthStar version that is. Last Sat. I had the dubious distinction of flooring my car on a open stretch of road in Houston to see how fast I could get it going, this sucker cut off at 108 with "Speed Limited" message on the message center. Are you frigging kidding me??? 108!! any GM V-6 will hit 105 and I have the W-rated tires on this thing good for 170mph, what a rip off!!! I'm pizzed about this. One guy on this forum told me a year ago that the STS V-8 would do it and he's done it. He was either lying or had his limiter removed somehow!!!!

  12. #27
    Ludacrisvp's Avatar
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    Service contract replaced the shock. The total cost was less than $900 installed with an alignment. (not what I paid just what the total would have been).

    I've not seen the limited message since and haven't been able to verify if this fixed the issue and it may just be "in my head" but I want to say the ride is improved quite a bit.

    Regarding the limited speed to 108... That is typical, your car may have been a rental / fleet vehicle, or I think the 17" wheels only had S rated tires on them.

    There are methods to remove / raise the limit. Efi live or hptuners are 2 of them that I know. On a dyno one tuner tested top speed as well for a 2005 RWD model, speed limited at 165mph due to mechanical limits of the car (gearing in the transmission / rear end) in 05 it was also a 5spd rather than the 6spd used in 08+ for all models. I've heard the 07 v8 also had the 6spd but I cannot say for certain.

  13. #28
    EChas3's Avatar
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    Re: Speed limited to 120mph

    The V's have the power to top 168 but at that speed there's a whole lot of drag.

  14. #29
    1BadCadSTS's Avatar
    1BadCadSTS is offline Cadillac Owners Connoisseur
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    Quote Originally Posted by DHspring
    What a ripoff, I thought these cars were capable of 155 MPH, the V-8 NorthStar version that is. Last Sat. I had the dubious distinction of flooring my car on a open stretch of road in Houston to see how fast I could get it going, this sucker cut off at 108 with "Speed Limited" message on the message center. Are you frigging kidding me??? 108!! any GM V-6 will hit 105 and I have the W-rated tires on this thing good for 170mph, what a rip off!!! I'm pizzed about this. One guy on this forum told me a year ago that the STS V-8 would do it and he's done it. He was either lying or had his limiter removed somehow!!!!
    You have a base v8. Limited by the factory tire speed rating. My 1sg has been to 148 so far still had some room left to play.

  15. #30
    truckinman is offline Cadillac Owners Connoisseur
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    Ine cuts off round 120-125. 3,6 tho. But I was disappointed at that tho. Lol. Had a 2003 eclipse GTS with only 210 hp but I don't think that car was electronically governed. Hit 140 in it once. My Lexus GS400 was good to 155. Never got that high tho. Hell my 04 jeep grand Cherokee V8 didn't hit a gov until 115. Lol. Granted it takes a lot longer to hit that than it does my caddy to hit it's top end but still. Was hoping it'd go more than 5-10 faster Thant lifted SUV with offroad tires on it. Lol

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