Cadillac CT4 2021 Factory Workshop Service Repair Manual

Cadillac CT4 2021 Factory Workshop Service Repair Manual

These are the same manuals used by professionals to diagnose and repair these models.

Loaded with illustrations, instructions, photos, and diagrams, complete to service and repair your vehicle. Read and print pages directly or copy the entire manual to your hard drive.

CD COVER:

Cadillac CT4  2.0L  2.7L  2021 Service Manual

SERVICE MANUAL COVER:

Engine

12 V Starting and Charging

Engine Controls and Fuel – 2.0L  2.7L

Engine Heating and Cooling

Engine Mechanical

Exhaust

Body Hardware and Trim

Exterior Trim

Floor Coverings and Headlinings

Instrument Panel and Console Trim

Interior Trim and Paneling

Body Repair

Bolted Exterior Body Panels and Closures

Bumpers and Fascias

Collision Repair

Frame and Underbody

Paint and Coatings

Body Systems

Horns and Pedestrian Alerts

Lighting

Mirrors

Vehicle Access

Wipers and Washers

Brakes

Antilock Brake System

Disc Brakes

Hydraulic Brakes

Park Brake

Diagnostic Overview, Starting Point, and Programming

Driveline and Axle

Wheel Drive Shafts

Driver Information and Entertainment

Active Noise Cancellation

Cellular, Entertainment, and Navigation

Displays and Gauges

Image Display Cameras

General Information

Air|Wind Noise

Maintenance and Lubrication

Vibration Diagnosis and Correction

Waterleaks

HVAC

Heating, Ventilation, and Air Conditioning

Preface

Dangers, Warnings, and Cautions

Roof

Removable Top

Safety and Security

Driver Assistance Systems

Immobilizer

Parking Assistance Systems

Remote Functions

Seat Belts

Supplemental Restraints

Theft Deterrent

Seats

Seat Hardware, Trim, and Upholstery

Seat Heating and Cooling

Steering

Power Steering

Steering Wheel and Column

Suspension

Front Suspension

Rear Suspension

Suspension General Diagnosis

Tire Pressure Monitoring

Tires and Wheels

Wheel Alignment

Transmission

Automatic Transmission

Electronic Transmission Range Select

Transmission Cooling

This manual is the same as the manual used by workshops. Service Manual contains detailed instructions and step by step diagrams for all workshop procedures.

Language: English 
Format: PDF

COMPATIBLE WITH ALL WINDOWS & MAC COMPUTERS 
(WINDOWS 11, WINDOWS 10, WINDOWS 8 ETC.)

Windows/Mac/Tablet/Phone Friendly

• Standard Engine (Luxury, Premium Luxury, Sport): A 2.0-liter turbocharged four-cylinder engine producing 237 horsepower and 258 lb-ft of torque, paired with an 8-speed automatic transmission.
• Available Engine (Premium Luxury): A 2.7-liter dual-volute turbocharged four-cylinder with 310 horsepower and 350 lb-ft of torque, paired with a 10-speed automatic transmission.
• CT4-V Engine: A high-output version of the 2.7-liter engine, making 325 horsepower and 380 lb-ft of torque and paired with the 10-speed automatic. 

• Luxury (Base): Included wireless Apple CarPlay and Android Auto, an 8-inch touchscreen infotainment system, a Wi-Fi hotspot, and standard safety features like automated emergency braking.
• Premium Luxury: Upgraded the interior with genuine leather seating, ambient lighting, and 18-inch wheels. It also added more standard safety features, such as blind-spot monitoring, and was the only trim to offer the mid-tier 2.7L engine as an option.
• Sport: Featured more aggressive styling with a performance grille, unique fascias, a rear spoiler, and sport seats. This trim came standard with the 2.0L engine.
• CT4-V: The performance-oriented V-Series included the powerful 325-hp 2.7L engine, a sport-tuned adaptive suspension with Magnetic Ride Control, Brembo brakes, and a limited-slip differential. 

• Transmission valve defect (March 2025): A recall was issued for vehicles with the 10-speed transmission, including certain 2020–2021 CT4s. The defect can cause internal damage and, in rare cases, momentary wheel lock-up.
• Air bag malfunctions (August 2021): A recall was issued for incorrectly installed roof rail side-curtain air bags that could result in improper deployment during a crash.
• Faulty engine control modules (December 2023): A fix was released for 2.0L engine models with incorrectly calibrated Engine Control Modules that could fail to indicate a catalytic converter issue.
• Exterior lighting (December 2022): A recall for an issue where the daytime running lights (DRLs) might not deactivate when the headlights were on. 

• Experts (e.g., Edmunds and Car and Driver) often note that while the 
  CT4

   is a great handler with strong engine options, its interior materials and design are not as refined as rivals. They also point out the cramped back seat and small trunk.

• Consumers (e.g., Kelley Blue Book) tend to rate the 
  CT4

   highly, with many praising its styling, performance, and features. Some owners who purchased the V-Series especially appreciated the handling and engine.