🏷️ Basic Information

Make:

Cadillac

Model:

STS

Year:

2005

Generation Designation:

Second Generation (Second Facelift)

Platform:

GM Sigma platform

Chassis Code:

VBS

👋 Introduction

Segment:

Luxury Mid-size Sedan

Competitors:

BMW 5 Series, Mercedes-Benz E-Class, Audi A6, Lexus GS

Vehicle Focus:

Performance, luxury, advanced technology, comfortable ride

Manual Value Proposition:

Empowers owners to perform their own maintenance and repairs, saving significant costs and ensuring proper upkeep.

Manual Ease Of Use:

Features step-by-step instructions and clear illustrations for accessible DIY repairs.

📋 Manual Details

Primary Coverage:

All models, engines, trim levels, and transmission types for the 2005 Cadillac STS

Secondary Coverage:

Full service, repair, maintenance, troubleshooting, and diagnostic procedures

Estimated Page Count:

Extensive (typically 2000+ pages for a complete workshop manual)

Type:

Complete Workshop Service Repair Manual

Language:

English

Delivery Format:

Downloadable Digital File (PDF)

Accessibility:

Printable, viewable on PC, MAC, tablets, and smartphones

📖 Manual Coverage

Powertrain:

Engine (4.6L Northstar V8, 4.6L DI Northstar V8), Transmission (5-speed automatic 5L50-E), Drivetrain (RWD, AWD)

Chassis:

Suspension (front & rear), Steering, Brakes (ABS, traction control, stability control), Wheels & Tires

Electrical:

Body Control Module (BCM), Powertrain Control Module (PCM), HVAC, Infotainment, Lighting, Power Accessories, SRS (Airbag) System, Diagnostic Trouble Codes (DTCs)

Body:

Body Panels, Doors, Windows, Seats, Interior Trim, Exterior Trim, Glass

Maintenance:

Oil changes, filter replacements, fluid checks and changes, spark plugs, belts, battery service

Repair:

Engine mechanical, transmission overhaul, brake component replacement, suspension strut/shock replacement, steering rack replacement, electrical component diagnosis and replacement

Troubleshooting:

Diagnostic flowcharts, symptom-based troubleshooting guides, electrical schematics, component testing procedures

Diagnostics:

OBD-II diagnostics, scan tool data interpretation, sensor data analysis, actuator testing

Depth:

Comprehensive from basic maintenance to complex system diagnostics and overhauls

Detail Level:

Step-by-step instructions with detailed diagrams and illustrations

📊 Manual Specifications

File Type:

PDF (Portable Document Format)

Software Requirement:

Adobe Acrobat Reader (free download)

Printability:

High-quality, printable pages for individual sections or the entire manual

Digital Binding:

Not Applicable (Digital Download)

Digital Paper Type:

Not Applicable (Digital Download)

⚙️ Engine Specifications

Engine Code 1:

LD8 (4.6L Northstar V8)

Engine Displacement 1:

4.6 Liters / 281 cubic inches

Engine Configuration 1:

V8, 90-degree bank angle

Engine Horsepower 1:

Approx. 275-290 hp @ 6000 rpm (depending on specific tune)

Engine Torque 1:

Approx. 300-305 lb-ft @ 4400 rpm (depending on specific tune)

Fuel Induction 1:

Multi-port Fuel Injection (MPFI)

Valvetrain 1:

Dual Overhead Camshafts (DOHC), 4 valves per cylinder

Engine Code 2:

LC3 (4.6L DI Northstar V8 - Direct Injection)

Engine Displacement 2:

4.6 Liters / 281 cubic inches

Engine Horsepower 2:

Approx. 320 hp @ 6400 rpm

Engine Torque 2:

Approx. 315 lb-ft @ 4400 rpm

Fuel Induction 2:

Direct Injection (DI)

Recommended Fuel:

Premium Unleaded Gasoline (91 octane or higher recommended for optimal performance)

🔧 Transmission

Type Standard:

5-speed automatic

Transmission Code Standard:

5L50-E

Drivetrain Options:

Rear-Wheel Drive (RWD), All-Wheel Drive (AWD)

Transmission Features:

Driver Shift Control (manual shifting capability), performance shift modes

Transmission Fluid Type:

Dexron VI (or equivalent)

📐 Dimensions

Length:

Approx. 199.8 inches (5075 mm)

Width:

Approx. 72.6 inches (1844 mm)

Height:

Approx. 57.7 inches (1466 mm)

Wheelbase:

Approx. 117.5 inches (2984 mm)

Curb Weight Rwd:

Approx. 3,770 - 3,850 lbs (1710 - 1746 kg)

Curb Weight AWD:

Approx. 3,950 - 4,050 lbs (1792 - 1837 kg)

Trunk Volume:

Approx. 15.1 cubic feet (427 liters)

🛡️ Safety Features

NHTSA Front Impact Driver:

5-Star

NHTSA Front Impact Passenger:

5-Star

NHTSA Side Impact Front Driver:

5-Star

NHTSA Side Impact Front Passenger:

5-Star

NHTSA Side Impact Rear Driver:

5-Star

NHTSA Side Impact Rear Passenger:

5-Star

IIHS Front Offset Crash Rating:

Good

ABS:

Standard 4-wheel Anti-lock Braking System (ABS)

Traction Control:

Standard Traction Control System (TCS)

Stability Control:

Standard StabiliTrak (Electronic Stability Control)

Airbags:

Frontal airbags (driver and passenger), front side-impact airbags, roof-mounted side-impact curtain airbags

💡 Technology Features

Infotainment System:

Cadillac's acclaimed Bose premium audio system, optional DVD Navigation with touch screen interface.

Driver Assistance Features:

Adaptive Cruise Control (optional), Parking Assist (optional rear sensors).

Connectivity Features:

OnStar® communication system (subscription-based).

🔧 Maintenance

Oil Change Interval:

Every 5,000 to 7,500 miles (or as indicated by the Oil Life Monitoring System), using synthetic oil.

Engine Air Filter:

Inspect every 15,000 miles, replace as needed (typically every 30,000-45,000 miles).

Cabin Air Filter:

Replace every 15,000-20,000 miles.

Spark Plugs:

Platinum tipped: Replace around 100,000 miles. Iridium tipped: Typically longer life, refer to manual for exact interval.

Transmission Fluid:

Inspect every 30,000 miles, change as per manual recommendations or severe service conditions (typically around 60,000-100,000 miles).

Engine Oil Type:

SAE 5W-30 Synthetic Engine Oil meeting GM specification GM6094M.

Engine Oil Capacity:

Approx. 5.5 quarts (5.2 Liters) with filter change for 4.6L V8.

Coolant Type:

GM P/N 12378393 (Orange) or equivalent Dex-Cool® compatible long-life coolant.

Brake Fluid Type:

DOT 3 or DOT 4 Hydraulic Brake Fluid.

Common Issue 1:

StabiliTrak/Traction Control System faults often related to wheel speed sensors or steering position sensor.

Common Issue 2:

Active fuel management (AFM) system issues in later Northstar variants or cylinder deactivation systems (if applicable) can lead to oil consumption or rough idle.

Common Issue 3:

HVAC blend door actuator failures causing incorrect air temperature distribution.

Common Issue 4:

Power steering fluid leaks or pump noise, particularly with higher mileage.

📚 Vehicle History

Cadillac Legacy:

Cadillac, an iconic American luxury brand, has a long history of producing premium automobiles known for their comfort, style, and advanced technology.

Sts Lineage:

The STS (Seville Touring Sedan) was positioned as Cadillac's flagship luxury sedan, evolving from the front-wheel-drive Seville. The second generation (2005-2011) marked a significant shift with the adoption of the rear-wheel-drive Sigma platform, enhancing its driving dynamics to compete more effectively with European luxury sedans.

Manufacturing Location:

Lansing Grand River Assembly, Lansing, Michigan, USA

Model Year Introduction:

2005

🏆 Awards & Recognition

Automotive Journal Awards:

The 2005 STS received praise for its refined ride, powerful engines, and sophisticated interior, often placing well in comparison tests against luxury segment rivals.