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The 2005 Cadillac STS-V

Pictures Overview Specifications



Cadillac’s product renaissance continues with the all-new 2005 STS, which combines the best of the brand into a luxury performance sedan that has been designed, engineered and executed to deliver precision craftsmanship, exceptional performance and sophisticated luxury in a distinctly North American package.

Based on GM’s rear-wheel-drive Sigma architecture, which also is the foundation for the Cadillac CTS, CTS-V and SRX, the STS is designed to compete squarely with world-renowned prestige sedans in global markets.

From its Cadillac-signature styling to its performance capabilities, STS is the product of unwavering attention to detail and the result is exceptional fit and finish, overall harmony, refined performance and purposeful innovation.

Crisp, elegant design

At first glance, there’s no mistaking the STS as anything but a contemporary Cadillac, with its vertically stacked headlamps and light-emitting diode (LED) taillamps, signature LED CHMSL, wire-mesh airfoil grille, horizontal spline lines, and dihedral-shaped hood.

Doors-into-roof construction enables more tumblehome, and the sides are sculpted inward, delivering a look of upscale performance with a lower roof line. In addition, a wider tapering sail panel, lower, sculptured hood, smooth wheel openings and a tight wheel-to-body relationship communicates agility, sophistication and substance.

Seven-spoke 17-inch or available nine-spoke 18-inch wheels lead to large, high-performance calipers and rotors. Overall length is 196.3 inches (498.6 cm). A wheelbase of 116.4 inches (295.6 cm)and front/rear track of 61.8/62.3 inches (156.9 / 158.2 cm), combined with a flush wheel-to-body relationship, ensures well-grounded appeal and presence.

Rocker treatments are specific to STS, bringing a sculpted shape to the vehicle’s lower line for presence and refinement. A single-piece fascia design, which eliminates seams for a clean, uninterrupted appearance, enables excellent fit and finish.

While its overall shape brings a faster profile and more rake than its CTS sibling, its form is still elegant and graceful. The STS is the largest sedan offering in the Sigma-based family.

The exterior takes Cadillac to the next level of refinement and illustrates the attention to detail apparent throughout the vehicle. The STS has a crisp exterior appearance thanks to precisely executed body and exterior dimensions and tight radii on major body components, such as the hood and decklid. Doors-into-roof construction and a superplastic-formed aluminum decklid ensure a clean, refined exterior.

Interior gaps achieve exceptionally close tolerances, enabling a tight, well-crafted appearance throughout. Eucalyptus wood and aluminum trim appears on the steering wheel, center console, instrument panel and door armrests.

The interior also features premium materials and fabrics. Available dual-firmness Tuscany all-leather seats are specially tanned for a softer feel. Also available is a heated and ventilated option on front seats. Natural grained surfaces on the door and instrument panel ensure an inviting, tactile touch, as do the headliner and interior pillars, which are soft backed and covered with a Monaco woven fabric.

STS powertrain

In terms of performance, the STS will be available with the 255-horsepower (190-kw)3.6L V-6 VVT in a rear-drive configuration, or the 320-horsepower (238-kw)Northstar 4.6L V-8 in rear- and all-wheel-drive. Both engines incorporate variable valve timing (VVT) and are mated to widely acclaimed five-speed automatic transmissions with Driver Shift Control.

The 4.6L Northstar is expected to deliver 0-to-60 mph performance at or less than 6 seconds. With the V-6 or AWD V-8, the STS is targeted to achieve 0-to-60 mph performance in under 7 seconds.

Variable valve timing for both intake and exhaust valves offers flexibility, fuel economy and reduced emissions. The four-cam variable valve timing is a key element in the V-6’s control strategy, which gives the engine a wide-ranging flexibility. For example, 90 percent of the 3.6L V-6’s peak torque is available across a broad operating range: from 1600 rpm to 5800 rpm. In addition, an electronically controlled throttle (ETC) effectively coordinates the driver’s intentions with the actions of the various control components.

Chassis refinements, safety systems

While the STS is true to Cadillac’s performance-oriented roots, a number of chassis refinements ensure a smooth ride that keeps drivers fresh and comfortable without sacrificing the driving experience.

Road impacts and other harsh inputs are effectively absorbed and dissipated through ride-tuned tires, dampers, suspension components and bushings, as well as improved structure in body-to-chassis interfaces and additional refinements in the engine mounts.

Integrated chassis control technologies include two-mode Magnetic Ride Control with performance or touring selections, an available high-precision ZF steering gear and four-channel StabiliTrak.

StabiliTrak assists the vehicle in maintaining the driver’s intended path by applying a brake force at any corner of the vehicle independent of the driver’s use of the brake pedal.

StabiliTrak uses an accelerator pedal position sensor, a brake master cylinder pressure sensor and a steering wheel angle sensor as inputs to interpret the driver’s desired path and whether to accelerate or decelerate the vehicle. StabiliTrak also uses these sensors plus a lateral accelerometer and yaw rate sensor to determine the vehicle’s actual path.

If the difference between the driver’s desired path and the vehicle’s actual path becomes great enough, StabiliTrak takes appropriate action to assist the driver with maintaining the desired path. If the vehicle begins to “snowplow,” or understeer, StabiliTrak applies the inside rear brake to help turn the vehicle. If the vehicle begins to fishtail, or oversteer, StabiliTrak applies the outside front brake to straighten the vehicle. StabiliTrak is integrated with the traction control and ABS systems.


Technological appointments on the STS are plentiful, purposeful and driver oriented. Applications include a Keyless Access system with a push button start, Adaptive Remote Start system (not available in Europe or Russia); Adaptive Cruise Control (ACC); reconfigurable, four-color head-up display (HUD); Automatic Advanced Crash Notification through OnStar; heated and ventilated seats; and heated steering wheel and Intellibeam, which automatically switches headlamps from high- to low-beam and back again when oncoming headlamps or forward lighting elements are sensed.

Keyless Access enables passive vehicle and trunk entry and push-button ignition via a personalized, keyless fob. With the key fob in a pocket or purse, a person can approach a locked vehicle, pull the door handle and open the door. The same concept applies when opening the trunk. As a result, the need to pull keys out – or even the fob – to activate the door and trunk functions has been eliminated. The system uses passive and active antennas to detect the vehicle fob and its proximity to the vehicle.

Keyless Access works in tandem with the vehicle security system, enabling the STS to be started with a momentary push of a button located on the instrument panel. To start the vehicle, the fob must be inside the vehicle and the brake pedal depressed.

The Adaptive Remote Start system, which operates from as far as 200 feet (60.9 m), also automatically adjusts a variety of personalization settings in the process.

When activated via the Adaptive Remote Start system, the STS – based on temperature inputs – begins to acclimate the occupant environment before the driver enters the vehicle. Once remote start is initiated, the vehicle:

  • Adjusts climate control to previously set cabin temperature
  • Begins seat heat or ventilation (based on feedback from outside temperature settings)
  • Activates front and rear window defroster if climate conditions require it

    The electrical architecture on the STS makes all this possible, allowing various systems in the vehicle to work in concert.

    The vehicle’s technological backbone is a GM LAN Serial Data Electrical Architecture – a high- and low-speed data network that connects system modules and ensures that information is properly communicated and shared between them.

    In all, the STS is equipped with up to 27 modules, located throughout the vehicle, depending upon options selected.

    Each module sends and receives information sent via the GM LAN.

    Of particular note is an available uplevel infotainment system. The cabin is immersed with 15 speakers from BoseCorporation. The Bose 5.1 Surround Sound system also has an integrated six-disc CD/DVD changer capable of playing DVD-A, CD and MP3. It includes an 8-inch (203 mm) VGA quality touch screen and advanced navigation. In addition, the system has Bluetooth capability, advanced voice recognition and OnStar.

    Like its Sigma-based siblings, the all-new STS will be built at GM’s state-of-the-art Lansing Grand River assemblycenter in Lansing, Mich., beginning in the summer of 2004.

    The STS arrives in Cadillac showrooms in late 2004 in the U.S. and Canada. Beginning in 2005, the STS will be available in Europe, Japan, Russia, the Middle East, South Korea, Taiwan and Israel.



    2005 Cadillac STS

    Body style / driveline:

    luxury 4-door performance sedan with rear-wheel drive (V-8 and V-6) or all-wheel drive (V-8 only at start of production)


    unitized welded steel body with direct-mounted front cradle and rubber-isolated, multi-link independent rear suspension assembly

    Manufacturing location:

    LansingGrand River Assembly, Lansing, Michigan

    Key competitors:

    BMW 5- & 7-Series, Mercedes-Benz E-Class, Lexus GS/LS 430, Audi A6, Jaguar S-Type


    3.6L V-6

    Northstar 4.6L V-8


    60-degree 3.6L V-6 VVT (variable valve timing)

    90-degree 4.6L V-8 VVT (variable valve timing)

    Displacement (cu in / cc):

    217 / 3564

    278 / 4565

    Bore & stroke (in / mm):

    3.7 x 3.37 / 94 x 85.6

    3.66 x 3.3 / 93 x 84

    Block material:

    cast aluminum

    cast aluminum

    Cylinder head material:

    semi-permanent mold aluminum

    semi-permanent mold aluminum


    roller follower DOHC, 4 valves per cylinder, continuously variable inlet and exhaust cam phasing

    roller follower DOHC, 4 valves per cylinder, continuously variable inlet and exhaust cam phasing

    Ignition system:

    coil-on-plug with extended-life dual platinum-tipped spark plugs

    coil-on-plug with extended-life dual platinum-tipped spark plugs

    Fuel delivery:

    returnless sequential fuel injection

    returnless sequential fuel injection

    Compression ratio:



    Horsepower (hp / kw @ rpm):

    255 / 190 @ 6500

    320 / 238 @ 6400

    Torque (lb-ft / Nm @ rpm):

    252 / 342 @ 3200

    315 / 459 @ 4400

    Recommended fuel:

    87 octane unleaded regular

    91 octane unleaded premium recommended

    Maximum engine speed (rpm):



    Emissions controls:

    evaporative system, close-coupled catalytic converters, positive crankcase ventilation, inlet and exhaust cam phasers, electronic throttle control feedback air-fuel-ratio control

    evaporative system, close-coupled catalytic converters, positive crankcase ventilation, inlet and exhaust cam phasers, electronic throttle control feedback air-fuel-ratio control

    Estimated fuel economy:


    MPG (city / hwy / combined)



    MPIG (city / hwy / combined)

    20 / 32 / 24

    RWD: 20 / 33 / 24
    AWD: 18 / 29 / 22

    L/100km (city / hwy / combined)

    14.2 / 8.8 / 11.7

    RWD: 14.2 / 8.6 / 11.6
    AWD: 15.8 / 9.7 / 13.0


    Hydra-Matic 5L40-E (V-6 )

    Hydra-Matic 5L50-E (V-8)


    5-speed electronically-controlled automatic with lockup torque converter, Driver Shift Control, and Performance Algorithm Liftfoot

    5-speed electronically-controlled automatic with lockup torque converter, Driver Shift Control, and Performance Algorithm Liftfoot

    Gear ratios (:1):



















    Final drive ratio:


    RWD:  2.73, 3.23, 3.42
    AWD:  3.23


    Standard/Luxury Package

    Sport Package


    independent, short/long arm, coil-over shock, anti-roll bar

    independent, short/long arm, coil-over shock, anti-roll bar


    independent, modified multi-link, coil springs, automatic load leveling shock absorbers, anti-roll bar

    independent, modified multi-link, coil springs, magnetic ride control, pneumatic load leveling, anti-roll bar

    Traction control system:



    Stabilizer bar: Front:

    hollow, 33-mm diameter

    hollow, 33-mm diameter

    Stabilizer bar: Rear:

    hollow, 17-mm diameter

    RWD: hollow, 19-mm diameter
    AWD: hollow, 24-mm diameter

    Steering type:

    power-assisted rack and pinion

    power-assisted rack and pinion; ZF Servotronic II variable assist system available

    Steering ratio:



    Steering wheel turns,



    Turning circle, curb-to-curb
    (ft / m):

    V-6  with 17-inch tires:  36.9 / 11.5

    V-8  with 17-inch tires:  37.7 / 11.5

    V-8  with 18-inch tires:  38.8 / 11.8



    power-assist – vacuum with anti-lock control, traction control and StabiliTrak stability control

    power-assist – vacuum with anti-lock control, traction control, StabiliTrak stability control, available high-performance European brake linings

    Rotor diameter x thickness
    (in / mm):

    front: 11.9 x 1.3 / 303 x 32 vented disc

    rear: 11.7 x 1.0 / 298 x 26 vented disc

    front: 12.7 x 1.3 / 323 x 32 vented disc

    rear: 12.6 x 1.0 / 320 x 26 vented disc


    Wheel size and type:

    17-inch x 7-inch cast aluminum

    17-inch x 7.5 / 8.0-inch (split size) aluminum

    18-inch x 8-inch flow formed aluminum


    Michelin V-rated, 235/50R17 and 255/45R17

    Michelin ALS 235/50R17

    Michelin V-rated, 235/50R17 and 255/45R17

    Michelin W-rated, 235/50R18 and 255/45R18

    Michelin Pilot Sport, 255/45R18



    Wheelbase (in / mm):

    116.4 / 2956

    Overall length (in / mm):

    196.3 / 4986

    Overall width (in / mm):

    72.6 / 1844

    Overall height (in / mm):

    57.6 / 1463

    Track (in / mm):

    front: 61.8 / 1569; rear: 62.3 / 1581

    Curb weight (lb / kg):

    3.6L automatic: 3857 / 1750; 4.6L automatic: 3921 / 1779; 4.6L automatic with AWD:  4230 / 1919

    Weight distribution
    (% front / rear):

    V-6: 52 / 48
    V-8: 54 / 46


    Head room (in / mm):

    front: 38.7 / 983
    rear: 37.9 / 962

    Leg room (in / mm):

    front: 42.6 / 1082
    rear: 38.3 / 972

    Shoulder room (in / mm):

    front: 58.6 / 1488
    rear: 57.4 / 1458

    Hip room (in / mm):

    front:  54.6 / 1387
    rear:   55.6 / 1412


    EPA total volume (cu ft / L):

    116.7 / 3305

    EPA trunk volume (cu ft / L):

    13.8 / 391

    Trailer towing maximum (lb / kg):

    1000 / 454

    Fuel tank (gal / L):

    17.5 / 66.2

    Engine oil (qt / L):

    V-6: 5 / 4.7, V-8: 10 / 9.4

    Cooling system (qt / L):

    10.9 / 10.3

    Seating capacity (front / rear):

    2 / 3

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