2020 Cadillac CT6 Service and Repair Manual

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Factory-Grade Data

2020 Cadillac CT6 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
  • Platinum Sedan 4-Door
  • Luxury Sedan 4-Door
  • Premium Luxury Sedan 4-Door

Engines covered

  • 4.2L 255Cu. In. V8 GAS DOHC Turbocharged
  • 3.6L 222Cu. In. V6 GAS DOHC Naturally Aspirated

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 CT6 Recalls & Complaints

NHTSA #19V73100015/10/2019Component: TIRES:PRESSURE MONITORING AND REGULATING SYSTEMS

General Motors LLC (GM) is recalling certain 2020 Cadillac CT6 vehicles equipped with dealer-installed accessory 20" x 8.50" wheels (RPO 5JO or SHH). The tire pressure monitoring system (TPMS) sensor

Consequence

Drivers may drive the vehicle with low tire pressure without a low tire pressure warning, negatively

Remedy

GM will notify owners, and dealers will replace all four TPMS sensors with the correct sensors, free

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 #11027701

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

TSB #11027697

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

TSB #11027601

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

TSB #11026104

This service bulletin provides information on Tire Sidewall Irregularities.

Showing the 8 most recent of 750 technical service bulletins on file with NHTSA.

20201115Component: SERVICE BRAKESCrash reported

ON FRIDAY, NOVEMBER 13, 2020 I WAS STOPPED AT A STOPLIGHT IN MARYSVILLE, OHIO. IT APPEARED THAT TRAFFIC STARTED TO MOVE, SO I TOOK MY FOOT OFF THE BRAKE. ALMOST IMMEDIATELY THE EMERGENCY BRAKING FEATU

20201115Component: FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKINGCrash reported

ON FRIDAY, NOVEMBER 13, 2020 I WAS STOPPED AT A STOPLIGHT IN MARYSVILLE, OHIO. IT APPEARED THAT TRAFFIC STARTED TO MOVE, SO I TOOK MY FOOT OFF THE BRAKE. ALMOST IMMEDIATELY THE EMERGENCY BRAKING FEATU

20250930Component: WHEELS

The vehicle was shifting harshly and my wheels were experiencing lock up while in motion which was very dangerous. I experienced this on the parkway as well as streets and almost had a few accidents d

20250930Component: POWER TRAIN

The vehicle was shifting harshly and my wheels were experiencing lock up while in motion which was very dangerous. I experienced this on the parkway as well as streets and almost had a few accidents d

20250715Component: POWER TRAIN

The contact owns a 2020 Cadillac CT6. The contact stated while driving 65 MPH, the transmission seized, and the vehicle was coasted over to the right side of the roadway while waiting for tow service.

Showing the 5 most serious of 16 complaints filed with NHTSA.

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