Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2019 Cadillac CTS Base, AWDFACTORY OEM SERVICE PROCEDURE
Repair and Diagnosis
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- Quick Lookups
- Common Specs & Procedures
- DTC Index
- Electrical Component Locations
- Component Locations - Electrical Center Identification Views
- Electrical Component Locator - Door Component Views
- Electrical Component Locator - Front Of Vehicle/Engine Compartment Component Views
- Electrical Component Locator - Ground Views
- Electrical Component Locator - Instrument Panel/Center Console Component Views
- Electrical Component Locator - Luggage Compartment/Rear Of Vehicle Component Views
- Electrical Component Locator - Master Electrical Component List
- Electrical Component Locator - Passenger Compartment/Roof Component Views
- Electrical Component Locator - Powertrain Component Views
- Electrical Component Locator - Wheels/Vehicle Underbody Component Views
- Fluids
- Technical Bulletins
- Tire Fitment
- Wiring Diagrams
- Component Connector End Views - Index
- Component Connector End Views (A7-B63LF)
- Component Connector End Views (B63LR-E6)
- Component Connector End Views (E7L-K9 (X3)
- Component Connector End Views (K182-Q10P)
- Component Connector End Views (K20 (X2)-K40P)
- Component Connector End Views (K40P-K178)
- Component Connector End Views (K9 (X4)-K20 (X1))
- Component Connector End Views (Q12-S71)
- Component Connector End Views (S72-X92RA)
- Component Connector End Views And Electrical Component Locations - Miscellaneous
- Inline Harness Connector End Views - Index
- Inline Harness Connector End Views (X100-X151)
- Inline Harness Connector End Views (X151-X228)
- Inline Harness Connector End Views (X275-X422)
- Inline Harness Connector End Views (X500-X915)
- System Wiring Diagrams
- Using lemon2025'S System Wiring Diagrams
- Wiring Systems And Power Management - Schematic Wiring Diagrams And Wiring Harness Routing Diagrams
- Accessories & Equipment
- Accessories Control Systems
- Anti-Theft Systems
- Body Interior
- Collision/Avoidance
- Communication Devices
- Data Communications - Description And Operation
- Data Communications - Diagnostic Information And Procedures
- Data Communications - Repair Instructions
- Data Communications - Schematic Wiring Diagrams
- Data Communications - Special Tools And Equipment
- Programming And Setup
- Vehicle-To-Vehicle Communication System
- Cruise Control Systems
- Drivers Assistance Systems - ADAS
- Entertainment Systems
- Exterior Lights
- Gauges & Instrument Panels
- Headlights
- Heated Glass/Defoggers
- Horns
- Ignition Switch/Steering Lock
- Infotainment
- Interior/Exterior Trim
- Interior/Illumination Lights
- Memory Modules
- Mirrors
- Seats
- Steering Column Switches
- Warning Systems
- Window Motors & Regulators
- Wiper/Washer Systems
- Body & Frame
- Brakes
- Drivelines & Axles
- Electrical
- Body Electrical
- Component Connector End Views - Index
- Component Connector End Views (A7-B63LF)
- Component Connector End Views (B63LR-E6)
- Component Connector End Views (E7L-K9 (X3)
- Component Connector End Views (K182-Q10P)
- Component Connector End Views (K20 (X2)-K40P)
- Component Connector End Views (K40P-K178)
- Component Connector End Views (K9 (X4)-K20 (X1))
- Component Connector End Views (Q12-S71)
- Component Connector End Views (S72-X92RA)
- Component Connector End Views And Electrical Component Locations - Miscellaneous
- Component Locations - Electrical Center Identification Views
- Electrical Component Locator - Door Component Views
- Electrical Component Locator - Front Of Vehicle/Engine Compartment Component Views
- Electrical Component Locator - Ground Views
- Electrical Component Locator - Instrument Panel/Center Console Component Views
- Electrical Component Locator - Luggage Compartment/Rear Of Vehicle Component Views
- Electrical Component Locator - Master Electrical Component List
- Electrical Component Locator - Passenger Compartment/Roof Component Views
- Electrical Component Locator - Powertrain Component Views
- Electrical Component Locator - Wheels/Vehicle Underbody Component Views
- Inline Harness Connector End Views - Index
- Inline Harness Connector End Views (X100-X151)
- Inline Harness Connector End Views (X151-X228)
- Inline Harness Connector End Views (X275-X422)
- Inline Harness Connector End Views (X500-X915)
- Power Outlets
- Starting System And Charging System - Description And Operation
- Starting System And Charging System - Diagnostic Information And Procedures
- Starting System And Charging System - Fastener Specifications
- Starting System And Charging System - Repair Instructions
- Starting System And Charging System - Schematic Wiring Diagrams
- Starting System And Charging System - Special Tools And Equipment
- Wiring Systems And Power Management - Description And Operation
- Wiring Systems And Power Management - Diagnostic Information And Procedures
- Wiring Systems And Power Management - Fastener Specifications
- Wiring Systems And Power Management - Repair Instructions
- Wiring Systems And Power Management - Schematic Wiring Diagrams And Wiring Harness Routing Diagrams
- Wiring Systems And Power Management - Special Tools And Equipment
- Charging Systems
- Starting System And Charging System - Description And Operation
- Starting System And Charging System - Diagnostic Information And Procedures
- Starting System And Charging System - Fastener Specifications
- Starting System And Charging System - Repair Instructions
- Starting System And Charging System - Schematic Wiring Diagrams
- Starting System And Charging System - Special Tools And Equipment
- Component Locations
- Component Locations - Electrical Center Identification Views
- Electrical Component Locator - Door Component Views
- Electrical Component Locator - Front Of Vehicle/Engine Compartment Component Views
- Electrical Component Locator - Ground Views
- Electrical Component Locator - Instrument Panel/Center Console Component Views
- Electrical Component Locator - Luggage Compartment/Rear Of Vehicle Component Views
- Electrical Component Locator - Master Electrical Component List
- Electrical Component Locator - Passenger Compartment/Roof Component Views
- Electrical Component Locator - Powertrain Component Views
- Electrical Component Locator - Wheels/Vehicle Underbody Component Views
- Fuses & Circuit Breakers
- Gauges
- Horns
- Motors, Switches, Relays
- Component Connector End Views - Index
- Component Connector End Views (A7-B63LF)
- Component Connector End Views (B63LR-E6)
- Component Connector End Views (E7L-K9 (X3)
- Component Connector End Views (K182-Q10P)
- Component Connector End Views (K20 (X2)-K40P)
- Component Connector End Views (K40P-K178)
- Component Connector End Views (K9 (X4)-K20 (X1))
- Component Connector End Views (Q12-S71)
- Component Connector End Views (S72-X92RA)
- Component Connector End Views And Electrical Component Locations - Miscellaneous
- Component Locations - Electrical Center Identification Views
- Electrical Component Locator - Door Component Views
- Electrical Component Locator - Front Of Vehicle/Engine Compartment Component Views
- Electrical Component Locator - Ground Views
- Electrical Component Locator - Instrument Panel/Center Console Component Views
- Electrical Component Locator - Luggage Compartment/Rear Of Vehicle Component Views
- Electrical Component Locator - Master Electrical Component List
- Electrical Component Locator - Passenger Compartment/Roof Component Views
- Electrical Component Locator - Powertrain Component Views
- Electrical Component Locator - Wheels/Vehicle Underbody Component Views
- Inline Harness Connector End Views - Index
- Inline Harness Connector End Views (X100-X151)
- Inline Harness Connector End Views (X151-X228)
- Inline Harness Connector End Views (X275-X422)
- Inline Harness Connector End Views (X500-X915)
- Power Outlets
- Starting System And Charging System - Description And Operation
- Starting System And Charging System - Diagnostic Information And Procedures
- Starting System And Charging System - Fastener Specifications
- Starting System And Charging System - Repair Instructions
- Starting System And Charging System - Schematic Wiring Diagrams
- Starting System And Charging System - Special Tools And Equipment
- Wiring Systems And Power Management - Description And Operation
- Wiring Systems And Power Management - Diagnostic Information And Procedures
- Wiring Systems And Power Management - Fastener Specifications
- Wiring Systems And Power Management - Repair Instructions
- Wiring Systems And Power Management - Schematic Wiring Diagrams And Wiring Harness Routing Diagrams
- Wiring Systems And Power Management - Special Tools And Equipment
- Starter
- Starting System And Charging System - Description And Operation
- Starting System And Charging System - Diagnostic Information And Procedures
- Starting System And Charging System - Fastener Specifications
- Starting System And Charging System - Repair Instructions
- Starting System And Charging System - Schematic Wiring Diagrams
- Starting System And Charging System - Special Tools And Equipment
- Wiring Diagrams
- Component Connector End Views - Index
- Component Connector End Views (A7-B63LF)
- Component Connector End Views (B63LR-E6)
- Component Connector End Views (E7L-K9 (X3)
- Component Connector End Views (K182-Q10P)
- Component Connector End Views (K20 (X2)-K40P)
- Component Connector End Views (K40P-K178)
- Component Connector End Views (K9 (X4)-K20 (X1))
- Component Connector End Views (Q12-S71)
- Component Connector End Views (S72-X92RA)
- Component Connector End Views And Electrical Component Locations - Miscellaneous
- Inline Harness Connector End Views - Index
- Inline Harness Connector End Views (X100-X151)
- Inline Harness Connector End Views (X151-X228)
- Inline Harness Connector End Views (X275-X422)
- Inline Harness Connector End Views (X500-X915)
- System Wiring Diagrams
- Using lemon2025'S System Wiring Diagrams
- Wiring Systems And Power Management - Schematic Wiring Diagrams And Wiring Harness Routing Diagrams
- Body Electrical
- Engine Mechanical
- Cooling System (Mechanical)
- Exhaust System
- Lubrication System
- Mechanical
- Engine Mechanical - 2.0L (LTG) - Component Locator
- Engine Mechanical - 2.0L (LTG) - Description And Operation
- Engine Mechanical - 2.0L (LTG) - Diagnostic Information And Procedures
- Engine Mechanical - 2.0L (LTG) - Repair Instructions - Off Vehicle
- Engine Mechanical - 2.0L (LTG) - Repair Instructions - On Vehicle
- Engine Mechanical - 2.0L (LTG) - Schematic Wiring Diagrams
- Engine Mechanical - 2.0L (LTG) - Special Tools And Equipment
- Engine Mechanical - 2.0L (LTG) - Specifications
- Starter
- Starting System And Charging System - Description And Operation
- Starting System And Charging System - Diagnostic Information And Procedures
- Starting System And Charging System - Fastener Specifications
- Starting System And Charging System - Repair Instructions
- Starting System And Charging System - Schematic Wiring Diagrams
- Starting System And Charging System - Special Tools And Equipment
- Engine Performance
- Emissions
- Specifications
- System
- Data Communications - Diagnostic Information And Procedures
- Engine Controls And Fuel - 2.0L (LTG) - Description And Operation
- Engine Controls And Fuel - 2.0L (LTG) - DTC P0010 To P0333
- Engine Controls And Fuel - 2.0L (LTG) - DTC P0335 To P2635 & Diagnostic Information And Procedures
- Engine Controls And Fuel - 2.0L (LTG) - Repair Instructions
- Engine Controls And Fuel - 2.0L (LTG) - Schematic Wiring Diagrams
- Engine Controls And Fuel - 2.0L (LTG) - Special Tools And Equipment
- Engine Controls And Fuel - 2.0L (LTG) - Specifications
- Engine Controls And Fuel - 3.6L (LGX LF3) - Description And Operation
- Engine Controls And Fuel - 3.6L (LGX LF3) - DTC P0010 To P0114 (LF3)
- Engine Controls And Fuel - 3.6L (LGX LF3) - DTC P0116 To P0507
- Engine Controls And Fuel - 3.6L (LGX LF3) - DTC P05CC To P3436 & Diagnostic Information And Procedures
- Engine Controls And Fuel - 3.6L (LGX LF3) - Repair Instructions
- Engine Controls And Fuel - 3.6L (LGX LF3) - Schematic Wiring Diagrams
- Engine Controls And Fuel - 3.6L (LGX LF3) - Special Tools And Equipment
- Engine Controls And Fuel - 3.6L (LGX LF3) - Specifications
- Engine Controls And Fuel - 6.2L (LT4) - Description And Operation
- Engine Controls And Fuel - 6.2L (LT4) - DTC P0010 To P0455
- Engine Controls And Fuel - 6.2L (LT4) - DTC P0443 To P3452 & Diagnostic Information And Procedures
- Engine Controls And Fuel - 6.2L (LT4) - Repair Instructions
- Engine Controls And Fuel - 6.2L (LT4) - Schematic Wiring Diagrams
- Engine Controls And Fuel - 6.2L (LT4) - Special Tools And Equipment
- Engine Controls And Fuel - 6.2L (LT4) - Specifications
- Testing & Diagnosis
- Data Communications - Diagnostic Information And Procedures
- Engine Controls And Fuel - 2.0L (LTG) - Description And Operation
- Engine Controls And Fuel - 2.0L (LTG) - DTC P0010 To P0333
- Engine Controls And Fuel - 2.0L (LTG) - DTC P0335 To P2635 & Diagnostic Information And Procedures
- Engine Controls And Fuel - 2.0L (LTG) - Repair Instructions
- Engine Controls And Fuel - 2.0L (LTG) - Schematic Wiring Diagrams
- Engine Controls And Fuel - 2.0L (LTG) - Special Tools And Equipment
- Engine Controls And Fuel - 2.0L (LTG) - Specifications
- Engine Controls And Fuel - 3.6L (LGX LF3) - Description And Operation
- Engine Controls And Fuel - 3.6L (LGX LF3) - DTC P0010 To P0114 (LF3)
- Engine Controls And Fuel - 3.6L (LGX LF3) - DTC P0116 To P0507
- Engine Controls And Fuel - 3.6L (LGX LF3) - DTC P05CC To P3436 & Diagnostic Information And Procedures
- Engine Controls And Fuel - 3.6L (LGX LF3) - Repair Instructions
- Engine Controls And Fuel - 3.6L (LGX LF3) - Schematic Wiring Diagrams
- Engine Controls And Fuel - 3.6L (LGX LF3) - Special Tools And Equipment
- Engine Controls And Fuel - 3.6L (LGX LF3) - Specifications
- Engine Controls And Fuel - 6.2L (LT4) - Description And Operation
- Engine Controls And Fuel - 6.2L (LT4) - DTC P0010 To P0455
- Engine Controls And Fuel - 6.2L (LT4) - DTC P0443 To P3452 & Diagnostic Information And Procedures
- Engine Controls And Fuel - 6.2L (LT4) - Repair Instructions
- Engine Controls And Fuel - 6.2L (LT4) - Schematic Wiring Diagrams
- Engine Controls And Fuel - 6.2L (LT4) - Special Tools And Equipment
- Engine Controls And Fuel - 6.2L (LT4) - Specifications
- General Information
- Abbreviations
- Basic Trouble Shooting
- Brakes
- Check Lists
- Driveline/Axles
- DTC Index
- Electrical
- Engine
- Engine Performance
- Electrostatic Discharge Warning - General Information
- Engine Performance Diagnostic Routine Outline - General Information
- Engine Performance Safety Precautions
- Map - Engine Performance & Maintenance
- Parasitic Load Explanation & Test Procedures - General Information
- State Emission Standards - Diesel
- State Emission Standards - Gas
- Waveforms - Injector Pattern Tutorial - General Information
- Map - Exhaust Systems
- Heating, Ventilation & A/C (HVAC)
- Hoist/Jack
- Identification
- Metric Conversions
- OEM General Information
- Reset Procedures
- RPO Codes
- Specifications Index
- Steering
- Traction Control Disable Procedures
- Trouble Shooting - Manual Transmission - General Information
- Heating, Ventilation & A/C (HVAC)
- Maintenance
- Restraints
- Steering
- Suspension
- Transmission
- Automatic Trans
- Automatic Transmission - 8L45 (M5N) Or 8L90 (M5U) - Component Locator
- Automatic Transmission - 8L45 (M5N) Or 8L90 (M5U) - Description And Operation
- Automatic Transmission - 8L45 (M5N) Or 8L90 (M5U) - Diagnostic Information And Procedures
- Automatic Transmission - 8L45 (M5N) Or 8L90 (M5U) - Repair Instructions - Off Vehicle
- Automatic Transmission - 8L45 (M5N) Or 8L90 (M5U) - Repair Instructions - On Vehicle
- Automatic Transmission - 8L45 (M5N) Or 8L90 (M5U) - Schematic Wiring Diagrams
- Automatic Transmission - 8L45 (M5N) Or 8L90 (M5U) - Special Tools And Equipment
- Automatic Transmission - 8L45 (M5N) Or 8L90 (M5U) - Specifications
- Shift Lock Control System
- Transmission Cooling System
- Hydraulic Diagrams
- Transfer Case - BW 4474
- Automatic Trans
- External Pages
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.