🏷️ Basic Information

Make:

Cadillac

Model:

STS

Model Years Covered:

2008, 2009, 2010, 2011, 2012

Platform:

GM Sigma II

👋 Introduction

Target Audience:

Owners seeking to perform their own maintenance and repairs, independent repair shops, automotive enthusiasts, and DIY mechanics.

Value Proposition:

Provides vehicle-specific, factory-authorized repair information, eliminating the need for generic or less accurate aftermarket guides. Offers significant cost savings compared to dealership labor rates.

Ease Of Use:

Single, easy-to-use PDF manual eliminates the need to consult multiple physical books. Searchable text and ability to print specific pages enhances usability.

Content Quality:

Contains step-by-step instructions, diagrams, illustrations, and wiring schematics identical to what dealership technicians use.

📋 Manual Details

All Models:

True

All Repairs:

A-Z

Estimated Page Count:

Varies by specific engine and options, typically 2000-3000+ pages for a comprehensive factory manual.

Type:

Factory Service Manual / Repair Manual

Language:

English

Format:

PDF

📖 Manual Coverage

Engine:

Comprehensive coverage including V6 3.6L (LLT) and V8 4.6L (Northstar) engines, maintenance, diagnosis, repair, overhaul, timing systems, cooling, lubrication, fuel delivery, ignition, emissions, and performance tuning.

Transmission:

Coverage for the 6-speed automatic transmission (e.g., 6T70/6T75), including diagnosis, fluid service, internal component repair, electronic control systems, and torque converter service.

Drivetrain:

Detailed information on front-wheel drive (FWD) and all-wheel drive (AWD) systems, including drive shafts, CV joints, differentials, axle components, and related seals and bearings.

Suspension Steering:

Front and rear suspension systems, including shock absorbers, struts, control arms, bushings, ball joints, steering rack, power steering system (hydraulic and electric components), wheel alignment specifications, and troubleshooting.

Brakes:

Complete brake system coverage, including hydraulic components (master cylinder, calipers, lines, ABS modulator), brake pads, rotors, parking brake system, and diagnostic procedures for ABS, Traction Control, and StabiliTrak.

Electrical Electronics:

Extensive coverage of the vehicle's electrical system, including battery, charging system, starter, lighting (headlamps, tail lamps, interior), power windows, locks, mirrors, seat adjustments, body control modules (BCM), chassis control modules (CCM), infotainment system, and diagnostics.

Body Chassis:

Body structural components, doors, hinges, latches, exterior trim, interior trim, glass, mirrors, convertible top (if applicable), and associated hardware. Includes corrosion protection and repair.

HVAC:

Heating, ventilation, and air conditioning (HVAC) system components, including refrigerant system servicing, compressor, condenser, evaporator, blower motor, climate control module, and troubleshooting.

Safety Restraint:

Supplemental Restraint System (SRS) including airbags, seat belt pretensioners, related sensors, control modules, and diagnostic procedures. Covers proper handling and replacement of SRS components.

Multiplex Communication:

Detailed schematics and diagnostic information for the CAN (Controller Area Network) and other multiplexed communication systems that link various vehicle modules.

Maintenance Routines:

Scheduled maintenance, oil changes, filter replacements, fluid checks and changes, tire rotation, brake inspection, and general preventative care.

Diagnostic Troubleshooting:

Step-by-step diagnostic procedures for all major systems, including symptom-based troubleshooting, fault code interpretation (DTCs), and electrical system diagnostics.

Component Replacement:

Detailed instructions for replacing individual components such as sensors, actuators, pumps, alternators, starters, fuel injectors, brake components, suspension parts, and interior/exterior trim.

Engine Rebuild:

Complete procedures for engine disassembly, inspection, cleaning, machining specifications, and reassembly for both V6 and V8 engines.

Transmission Overhaul:

In-depth instructions for the overhaul of the automatic transmission, including component identification, clearance specifications, seal replacement, and reassembly.

Electrical Schematics:

Comprehensive and detailed wiring diagrams and schematics for all electrical systems, including power distribution, grounds, and circuit tracing.

Body Repair:

Information on body panel alignment, door adjustments, glass replacement, and minor collision repair procedures.

HVAC Service:

Procedures for evacuating and recharging the A/C system, component replacement (compressor, drier, expansion valve), and leak detection.

Srs Replacement:

Safe and correct procedures for replacing airbag modules, seat belts, and related SRS components, including disabling the system.

Engine Control System:

Detailed diagnostics and repair procedures for the Engine Control Module (ECM) or Powertrain Control Module (PCM), including sensor inputs, actuator outputs, and emissions control systems (e.g., EVAP, catalytic converter).

Fuel Service Specifications:

Fuel pressure specifications, injector flow rates, fuel pump diagnostics, and fuel filter replacement procedures.

Ignition Starting Charging:

Diagnosis and repair of the ignition system (spark plugs, coils, wiring), starting system (starter motor, solenoid), and charging system (alternator, voltage regulator).

Depth:

Factory-level, dealer technician grade. Covers everything from basic fluid changes to complex component diagnostics and complete engine/transmission overhauls. Includes torque specifications, clearance measurements, and assembly procedures.

📊 Manual Specifications

File Type:

PDF (Portable Document Format)

Printability:

All pages are printable, allowing users to print only the necessary sections or diagrams for use in the workshop. Images can be enlarged for detailed viewing.

Binding:

N/A (Digital Format)

Paper Type:

N/A (Digital Format)

Required Software:

Adobe PDF Reader (free), Winzip or equivalent unzipping software (free online).

Operating Systems:

Windows Vista (32/64-bit), XP, ME, 98, NT, 2000, and macOS.

⚙️ Engine Specifications

Engine Options:

3.6L V6 (LLT) and 4.6L V8 (Northstar)

V6 Horsepower:

Approximately 302 hp @ 6300 rpm (LLT)

V6 Torque:

Approximately 264 lb-ft @ 5200 rpm (LLT)

V8 Horsepower:

Approximately 320 hp @ 6400 rpm (Northstar)

V8 Torque:

Approximately 315 lb-ft @ 4400 rpm (Northstar)

Fuel Delivery V6:

Direct Injection (DI)

Fuel Delivery V8:

Port Fuel Injection (PFI)

V6 Engine Code:

LLT

V8 Engine Code:

4.6L Northstar

🔧 Transmission

Transmission Type:

6-speed automatic (e.g., 6T70/6T75)

All Wheel Drive:

Available with AWD

Transmission Fluid Type:

Dexron VI (refer to manual for exact specifications and capacities)

📐 Dimensions

Wheelbase:

115.6 inches (2936 mm)

Length:

199.4 inches (5065 mm)

Width:

72.9 inches (1852 mm)

Height:

58.5 inches (1486 mm)

Curb Weight V6 FWD:

Approximately 4087 lbs (1854 kg)

Curb Weight V8 AWD:

Approximately 4321 lbs (1960 kg)

🛡️ Safety Features

NHTSA Front Impact Driver:

5 Stars (2008-2012 models generally received high ratings)

NHTSA Front Impact Passenger:

5 Stars (2008-2012 models generally received high ratings)

IIHS Top Safety Pick:

The STS received Top Safety Pick awards in several model years within this range.

Traction Control:

Standard Electronic Traction Control System (TCS)

Stability Control:

Standard StabiliTrak stability control system

Anti Lock Brakes:

Standard Anti-lock Braking System (ABS)

Airbags:

Front airbags, side-impact airbags, and side curtain airbags

Seat Belts:

Three-point seat belts with pretensioners

💡 Technology Features

Infotainment System:

Cadillac's acclaimed infotainment system, typically featuring a prominent dashboard display, navigation, audio system, and Bluetooth connectivity. The manual covers system operation and basic troubleshooting.

Adaptive Cruise Control:

Available adaptive cruise control system, which automatically adjusts speed to maintain a set distance from the vehicle ahead. Covered in manual's cruise control section.

Parking Assist:

Rear parking assist sensors and available front parking assist sensors. Manual will detail operation and diagnostics.

Bluetooth Connectivity:

Standard Bluetooth for hands-free calling and audio streaming. Manual provides pairing instructions.

Remote Start:

Available remote start system. Manual covers operation and potential issues.

🔧 Maintenance

Oil Change Interval:

Typically every 7,500 miles or 12 months, or as indicated by the Oil Life System. Consult manual for specific engine and oil type.

Transmission Fluid Change:

Recommended at 60,000 to 100,000 miles, or under severe driving conditions. Consult manual for specific interval and procedure.

Engine Coolant Change:

Typically at 5 years or 100,000 miles for the initial fill, then every 2-5 years or 30,000-100,000 miles. Consult manual for specific type (e.g., Dex-Cool).

Engine Oil V6 Llt:

SAE 5W-30, API SN or higher, dexos1 approved (e.g., GM part # 19300941 for full synthetic)

Engine Oil V8 Northstar:

SAE 5W-30, API SN or higher, dexos1 approved (e.g., GM part # 19300941 for full synthetic)

Brake Fluid:

DOT 3 or DOT 4 (refer to manual for specific type and GM part number)

Northstar Engine Issues:

While improved in later generations, some Northstar engines could be prone to coolant leaks, particularly from the rear main seal or head gaskets. Proper maintenance is crucial.

Strut Mounts:

Some owners reported premature wear of strut mounts, leading to clunking noises. The manual will detail inspection and replacement procedures.

Infotainment Glitches:

Early models may exhibit minor glitches or unresponsiveness in the infotainment system, often resolvable with software updates or specific reset procedures detailed in the manual.

📚 Vehicle History

Cadillac Legacy:

Cadillac is America's luxury automotive brand, known for its innovation, comfort, and performance since its founding in 1902.

Sts Lineage:

The STS (Seville Touring Sedan) replaced the original Seville. The 2005-2011 generation (GMX322 platform, later Sigma II) was a significant redesign, focusing on enhanced driving dynamics and modern luxury.

Manufacturing Location:

Lansing, Michigan, USA

Production End Year:

The STS was discontinued after the 2011 model year in North America, though some markets may have received a 2012 model year designation from leftover inventory.

🏆 Awards & Recognition

Jdpower Dependability:

While specific ratings fluctuate, Cadillac as a brand has often ranked well in J.D. Power's Vehicle Dependability Study in certain years. Consult historical J.D. Power reports for specific model year standings.

Consumer Reports Ratings:

Consumer Reports reviews and ratings are available for these model years, providing insights into reliability and owner satisfaction, which can be correlated with the information provided in the service manual.