2018 Cadillac ATS Service and Repair Manual

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Factory-Grade Data

2018 Cadillac ATS 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
  • V Coupe 2-Door
  • Base Sedan 4-Door
  • Sedan Sedan 4-Door
  • Luxury Coupe 2-Door
  • Premium Luxury Coupe 2-Door
  • Premium Performance Sedan 4-Door
  • Luxury Sedan 4-Door
  • Base Coupe 2-Door
  • Premium Luxury Sedan 4-Door
  • Coupe Coupe 2-Door
  • Premium Performance Coupe 2-Door

Engines covered

  • 3.6L 3564CC 217Cu. In. V6 GAS DOHC Turbocharged
  • 2.0L 1998CC 122Cu. In. l4 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

2018 Cadillac ATS Recalls & Complaints

NHTSA #18V35800031/05/2018Component: FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP

General Motors LLC (GM) is recalling certain 2015-2018 GMC Canyon, 2016-2017 Buick Envision, 2016-2018 Chevrolet Colorado and Malibu, 2017-2018 GMC Acadia, 2018 Buick LaCrosse, Cadillac ATS, Chevrolet

Consequence

A damaged fuel line can create a fuel leak, increasing the risk of a fire.

Remedy

GM will notify owners, and dealers will replace the high pressure fuel pump, and high pressure fuel

NHTSA #25V17500020/03/2025Component: STEERING:ELECTRIC POWER ASSIST SYSTEM

General Motors LLC (GM) is recalling certain 2016-2018 Cadillac CTS, 2017-2018 Cadillac ATS, Chevrolet Camaro, and Chevrolet Corvette vehicles. The electric power steering (EPS) assist may fail.

Consequence

A loss of power steering assist can require greater steering effort, especially at low speeds, incre

Remedy

Dealers will replace the power steering gear assembly, free of charge. Owner notification letters w

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 1053 technical service bulletins on file with NHTSA.

20220313Component: AIR BAGSCrash reported1 injured

Vehicle was involved in a accident all front damage and airbags didn’t deploy

20260512Component: STRUCTURE:BODY

Both side mirrors failed. Internal components corroded, one almost fell off when driving, the other later became completely detached. Failed parts that could have caused a major safety issue if they w

20251222Component: ELECTRICAL SYSTEM

The contact owns a 2018 Cadillac ATS. The contact stated that the check engine warning light was illuminated. The vehicle was taken to an independent mechanic, where it was diagnosed, and the mechanic

20250711Component: POWER TRAIN

Rear differential. This part will be available after removal. This put me at risk of potentially locking up while driving. According to the dealership, Faulkner Cadillac, "found rear differential bea

20250708Component: STEERING

My vehicle recently started experiencing an issue where the power steering would randomly cut out while I was driving. If I pulled over and shut the car off and then turned it back on the power steeri

Showing the 5 most serious of 26 complaints filed with NHTSA.

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