2020 Buick Regal Sportback Service and Repair Manual

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2020 Buick Regal Sportback 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

  • Base Hatchback 4-Door
  • Essence Hatchback 4-Door
  • Preferred Hatchback 4-Door
  • GS Hatchback 4-Door
  • Avenir Hatchback 4-Door

Engines covered

  • 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
NHTSA #19V76200024/10/2019Component: SEATS

General Motors LLC (GM) is recalling certain 2019-2020 Buick Regal vehicles. The driver or passenger front seat frames may have a lower crossbar that was improperly welded.

Consequence

Seats with improper welds may not provide adequate protection in the event of a crash, increasing the risk of an injury.

Remedy

GM will notify owners, and dealers will inspect the crossbar welds on the front seats. If the crossbar is improperly welded, the seat back frame will be replaced, free of charge. Interim notices informing owners of the safety risk were mailed November 26, 2019. Owners received a second notice and the recall began February 20, 2020. Owners may contact Buick customer service at 1-800-521-7300. GM's number for this recall is N192278300.

NHTSA #22V46500030/06/2022Component: SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM

General Motors, LLC (GM) is recalling certain 2018-2020 Buick Regal vehicles. In the event of a vacuum-power brake assist failure, a software error in the electronic brake control module (EBCM) may result in a loss of power brake assist. As such, these vehicles fail to conform to Federal Motor Vehicle Safety Standard No. 135, "Light vehicle brake systems."

Consequence

A loss of power brake assist can extend the distance required to stop the vehicle, increasing the risk of a crash.

Remedy

Dealers will update the EBCM software, free of charge. Interim owner notification letters advising owners of the safety risk were mailed on August 19, 2022. Owner notification letters were mailed September 16, 2022. Owners may contact Buick's customer service at 1-800-521-7300.

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 557 technical service bulletins on file with NHTSA.

05/15/20Component: ELECTRICAL SYSTEM

Proximity door unlock system rarely works goes in and out even with key fob in pocket and within Proximity. I've reported the problem to buick/Chevrolet many times, changed fob batteries and etc with no fix

01/13/20Component: TIRES

The contact owns a 2020 Buick Regal GS equipped with Continental ProContact TX Tires, Tire Size: 245/40/R19, DOT Number: 6Y66WBR71819. The contact stated while driving approximately 70 MPH, the TPMS warning light indicated that the rear driver’s side tire air pressure was low. The tire lost air pressure and became flat. Also, later the front passenger’s side tire developed bubbles and had to be replaced. Within the first 200 miles of driving the vehicle, a dealer employee experienced a blowout of the front passenger’s side tire. The contact stated that the vehicle was equipped with the tires w

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2019 Buick Regal Sportback Service and Repair Manual2018 Buick Regal Sportback Service and Repair Manual

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