2020 Cadillac CT5 Service and Repair Manual

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Factory-Grade Data

2020 Cadillac CT5 service and repair manual — a detailed, factory-style reference for maintenance, diagnostics, and repair. Use it to confirm correct procedures, specifications, and system coverage before you start work.

Built for technicians and DIY owners, this manual helps you troubleshoot accurately, follow step-by-step repair procedures, and use wiring diagrams and system sections to diagnose problems faster.

What’s included

  • Step-by-step repair procedures and service information
  • Specifications and reference data (where provided)
  • Electrical coverage with wiring diagrams
  • Coverage across key systems: engine, transmission, brakes, steering, suspension, HVAC, and more

Trims covered

  • V Sedan 4-Door
  • Sport Sedan 4-Door
  • Luxury Sedan 4-Door
  • Premium Luxury Sedan 4-Door

Engines covered

  • 3.0L 182Cu. In. V6 GAS DOHC Turbocharged
  • 2.0L 1998CC 122Cu. In. l4 GAS DOHC Turbocharged

Index / Table of contents

  • Body
  • Brakes
  • Chassis Electrical
  • Driveline
  • Engine Cooling
  • Engine Electrical
  • Engine Mechanical
  • Engine Performance & Emission Controls
  • Fuel System
  • General Information & Identification
  • Heating, Ventilation, & Air Conditioning
  • Hybrid & Electric Vehicle Systems
  • Steering
  • Suspension
  • Transmission, Clutch, & Transfer Case
  • Wiring Diagrams

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Vehicle Safety Data

2020 Cadillac CT5 Recalls & Complaints

NHTSA #20V58800024/09/2020Component: SERVICE BRAKES

General Motors LLC (GM) is recalling certain 2020 Chevrolet Corvette and Cadillac CT4, CT5 and XT4, 2021 Chevrolet Trailblazer, and 2020-2021 Buick Encore GX vehicles. Sensor connection contamination

Consequence

If communication with the sensor is interrupted, the electronic brake boost assist could be lost. E

Remedy

GM will notify owners, and dealers will replace the electronic brake boost module, free of charge.

NHTSA #22V90300008/12/2022Component: EXTERIOR LIGHTING:LIGHTING CONTROL MODULE:SOFTWARE

General Motors, LLC (GM) is recalling certain 2020-2023 Cadillac CT4 and CT5; 2021-2023 Buick Envision; and 2022-2023 Cadillac Escalade and Escalade ESV, Chevrolet Silverado 1500, Suburban, Tahoe, GMC

Consequence

DRLs that do not deactivate as intended may result in a glare, reducing visibility, and increasing t

Remedy

The body control module software will be updated by a dealer, or through an over-the-air (OTA) updat

NHTSA #21V61100005/08/2021Component: AIR BAGS:SIDE/WINDOW:CURTAIN

General Motors, LLC. (GM) is recalling certain 2020-2022 Cadillac CT4 and CT5 vehicles. The roof rail side-curtain air bags may not have been installed correctly, which could result in an improper ai

Consequence

Air bags that do not deploy properly can increase the risk of injury in a crash.

Remedy

Dealers will inspect both left and right-side roof rail air bags and reinstall the air bags, as nece

TSB #11031948

This Preliminary information communicates an issue with a replace or low FOB battery message

TSB #11030974

This preliminary information communicates information about how to determine if a wheel and tires size change is available.

TSB #11030092

This Preliminary information communicates the steps on how to save a GDS2 Session Log and upload to a Technical Assistance Case in CX Connect.

TSB #11030091

This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.

TSB #11029950

This Preliminary information communicates to the field on how to diagnosis a GPS issue with the Telematic module with no DTC'ss

TSB #11028658

This Preliminary information communicates the potential for condensation to freeze up inside the Crankcase Pressure Sensor causing dtc P04FB to set.

TSB #11027932

This PI provides diagnostics tips to dealership techs when trying to diagnose a CAN Bus communication issue after an event like a lightning strike, battery jump started backwards, failure over the air update, etc.

TSB #11027701

This PI advised dealer technicians of possible causes of diesel fuel contamination in gasoline powered vehicles and advises of warranty direction.

Showing the 8 most recent of 894 technical service bulletins on file with NHTSA.

20211105Component: AIR BAGSCrash reported2 injured

I have had many issues with Onstar failing. I bought the 2020 Cadillac CT5 AWD 10/2020. It took Onstar over a month to connect to my car to provide AT&T internet plan (via Onstar). On 4/22/21 I was hi

20211105Component: ELECTRICAL SYSTEMCrash reported2 injured

I have had many issues with Onstar failing. I bought the 2020 Cadillac CT5 AWD 10/2020. It took Onstar over a month to connect to my car to provide AT&T internet plan (via Onstar). On 4/22/21 I was hi

20211105Component: STEERINGCrash reported2 injured

I have had many issues with Onstar failing. I bought the 2020 Cadillac CT5 AWD 10/2020. It took Onstar over a month to connect to my car to provide AT&T internet plan (via Onstar). On 4/22/21 I was hi

20260112Component: POWER TRAINCrash reported

While slowing down vehicle felt as if it was put into park momentarily, which cause car to slide on ice. After reading the recall, I am certain that the transmission failed. Car was towed to Ray Skill

20260512Component: UNKNOWN OR OTHER

The rear passenger driver side outside door handle stopped working about 3 days ago. I have three small grandchildren and if there is an accident or any other emergency I cannot open the back door to

Showing the 5 most serious of 54 complaints filed with NHTSA.

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