2018 Cadillac CT6 Service and Repair Manual

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Factory-Grade Data

2018 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

  • Platinum Sedan 4-Door
  • Base Sedan 4-Door
  • Plug-In Sedan 4-Door
  • Luxury Sedan 4-Door
  • Premium Luxury Sedan 4-Door

Engines covered

  • 3.0L 182Cu. In. V6 GAS DOHC Turbocharged
  • 3.6L 222Cu. In. V6 GAS DOHC Naturally Aspirated
  • 2.0L 1998CC 122Cu. In. l4 GAS DOHC Turbocharged
  • 2.0L 1998CC 122Cu. In. l4 PLUG-IN HYBRID EV-GAS (PHEV) 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

2018 Cadillac CT6 Recalls & Complaints

NHTSA #18V43700028/06/2018Component: SEATS:MID/REAR ASSEMBLY

General Motors LLC (GM) is recalling certain 2016-2018 Cadillac CT6 vehicles. The inboard child seat anchorage bars may have had excess structural adhesive applied during assembly, which can interfer

Consequence

If the child seat cannot be attached correctly to the anchorage bar, there is an increased the risk

Remedy

GM will notify owners, and dealers will inspect, remove any excess adhesive, and apply anti-corrosio

NHTSA #18V67300026/09/2018Component: SEAT BELTS:REAR/OTHER

General Motors LLC (GM) is recalling certain 2018-2019 Cadillac CT6, Escalade ESV, Chevrolet Suburban, Volt, and GMC Yukon XL vehicles. Certain second-row or third-row rear seatbelts retractor assemb

Consequence

If the child seat is not properly secured in the event of a crash, it can increase the risk of injur

Remedy

GM will notify owners, and dealers will inspect the rear seatbelt retractors and replace them if nec

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 #11027689

This PI communicates the proper part numbers for transmission connectors and internal harness to prevent confusion when ordering

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.

TSB #11026017

This service bulletin provides information on replacing the intake manifold when the engine is replaced after severe internal engine damage.

TSB #11025755

This Preliminary Information communication provides information to the technician about vehicles that have had multiple repair attempts that are being performed on customers vehicles that exhibit vibration conditions without utilizing the s

Showing the 8 most recent of 692 technical service bulletins on file with NHTSA.

20251226Component: POWER TRAIN

Front differential case ripped in half and separated from the ring gear. The broken chunk of differential case and pinion was still attached to the driveshaft while coming to an abrupt stop. Damage do

20240215Component: STRUCTURE:BODY

Yes my car was sold to me with structural damages, and I was told any of this when I purchased it!!!!

20240215Component: SUSPENSION

Yes my car was sold to me with structural damages, and I was told any of this when I purchased it!!!!

20240215Component: STEERING

Yes my car was sold to me with structural damages, and I was told any of this when I purchased it!!!!

20230221Component: SERVICE BRAKES

The brake makes a rattling and metal grinding sound, the dealership said nothing is wrong with the brakes, still problematic. The transmission shifts too hard. Dealer said nothing wrong. Yet cat ki

Showing the 5 most serious of 13 complaints filed with NHTSA.

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