2021 Cadillac CT5 Service and Repair Manual

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Factory-Grade Data

2021 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

2021 Cadillac CT5 Recalls & Complaints

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 #11032764

Pi created to provide GM dealers with information on gathering information for projection issue

TSB #11032763

This Preliminary information communicates to dealer to perform a MEC reset for wireless projection issues

TSB #11031948

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

TSB #11031717

This PI communicates information on a SPS programming issue causing Serial Data Authentication Configuration to fail.

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

Showing the 8 most recent of 794 technical service bulletins on file with NHTSA.

20250726Component: AIR BAGSCrash reported1 injured

My 2025 Cadillac CT5 was stationary at a red light behind a red truck when a black truck traveling in the opposite direction struck the truck head-on. The red truck was pushed backward into the front

20210829Component: AIR BAGSCrash reported1 injured

There was no indication that the Automatic Braking System, Air Bags and Seatbelts were not working properly. In August 12, 2021, I was in an auto accident where I rear-ended another dodge car. The a

20210829Component: SEAT BELTSCrash reported1 injured

There was no indication that the Automatic Braking System, Air Bags and Seatbelts were not working properly. In August 12, 2021, I was in an auto accident where I rear-ended another dodge car. The a

20210829Component: FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKINGCrash reported1 injured

There was no indication that the Automatic Braking System, Air Bags and Seatbelts were not working properly. In August 12, 2021, I was in an auto accident where I rear-ended another dodge car. The a

20240801Component: ELECTRICAL SYSTEMCrash reported

When approaching a stopping vehicle the brake pedal became extremely hard to press and I could not brake enough to stop and had a collision. Come to find out that the ABS computer and the main ECU wer

Showing the 5 most serious of 28 complaints filed with NHTSA.

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